Neuromuscular Disorders

TOPLINE:

A smartphone app that delivers acceptance and commitment therapy (ACT), a type of cognitive behavioral therapy, improves overall well-being and reduces the severity of pain, fatigue, sleep issues, and depression to a greater extent than daily symptom tracking in patients with fibromyalgia.

METHODOLOGY:

• Researchers conducted the phase 3 PROSPER-FM trial at 25 community sites in the United States to assess the efficacy and safety of digital ACT for patients with fibromyalgia.
• A total of 275 adult patients aged 22-75 years with fibromyalgia were randomly assigned to either the digital ACT group (n = 140) or the active control group (n = 135) for 12 weeks.
• Patients in the digital ACT group received a self-guided, smartphone-delivered program in which they learned and practiced the core ACT skills of acceptance, values, mindfulness, defusion, self as context, and willingness and committed action to build psychological flexibility, while the control group underwent daily symptom tracking and received educational materials.
• The primary endpoint was the response rate on the Patient Global Impression of Change (PGIC) at week 12, which is an indicator of patient well-being.
• The secondary endpoints included changes in the Revised Fibromyalgia Impact Questionnaire (FIQ-R) total score and pain intensity, pain interference, and sleep interference scores.

TAKEAWAY:

• At week 12, 71% of the patients in the digital ACT group responded with a minimally improved or better change in the PGIC response, compared with only 22% of the patients in the control group (P < .0001).
• The digital ACT group showed a significant reduction in the impact of fibromyalgia, with a between-group effect size of d = 0.65 (P < .0001) at week 12. The FIQ-R total score significantly improved within 3 weeks of using the self-guided digital ACT app.
• The use of digital ACT also demonstrated positive effects on the levels of weekly pain intensity (P = .001) and depression (P < .0001), compared with the control group.
• No serious adverse effects related to the app were reported, and both groups demonstrated high rates of adherence, with most (72%) participants in the digital ACT group completing at least 42 sessions.

IN PRACTICE:

“The results found in the study are essential for professionals who care for patients with fibromyalgia as they present a new viable treatment alternative,” Guilherme Torres Vilarino, PhD, Santa Catarina State University, Florianópolis, Brazil, wrote in an accompanying editorial.

SOURCE:

This study was led by R. Michael Gendreau, MD, PhD, Gendreau Consulting, Poway, California. It was published online  in The Lancet.

LIMITATIONS:

The study population predominantly consisted of women and White individuals, which may limit the generalizability of the findings to more diverse populations. Additionally, the study was conducted in the United States, and the results may thus not be applicable to other countries with different racial, ethnic, educational, and economic characteristics. The study duration was 12 weeks, and the long-term benefits of digital ACT have not yet been shown.

DISCLOSURES:

This study was funded by Swing Therapeutics. Seven authors declared having stock options and/or receiving salary from Swing Therapeutics. Other authors reported having many ties with several sources, including Swing Therapeutics.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article first appeared on Medscape.com.

TOPLINE:

A smartphone app that delivers acceptance and commitment therapy (ACT), a type of cognitive behavioral therapy, improves overall well-being and reduces the severity of pain, fatigue, sleep issues, and depression to a greater extent than daily symptom tracking in patients with fibromyalgia.

METHODOLOGY:

• Researchers conducted the phase 3 PROSPER-FM trial at 25 community sites in the United States to assess the efficacy and safety of digital ACT for patients with fibromyalgia.
• A total of 275 adult patients aged 22-75 years with fibromyalgia were randomly assigned to either the digital ACT group (n = 140) or the active control group (n = 135) for 12 weeks.
• Patients in the digital ACT group received a self-guided, smartphone-delivered program in which they learned and practiced the core ACT skills of acceptance, values, mindfulness, defusion, self as context, and willingness and committed action to build psychological flexibility, while the control group underwent daily symptom tracking and received educational materials.
• The primary endpoint was the response rate on the Patient Global Impression of Change (PGIC) at week 12, which is an indicator of patient well-being.
• The secondary endpoints included changes in the Revised Fibromyalgia Impact Questionnaire (FIQ-R) total score and pain intensity, pain interference, and sleep interference scores.

TAKEAWAY:

• At week 12, 71% of the patients in the digital ACT group responded with a minimally improved or better change in the PGIC response, compared with only 22% of the patients in the control group (P < .0001).
• The digital ACT group showed a significant reduction in the impact of fibromyalgia, with a between-group effect size of d = 0.65 (P < .0001) at week 12. The FIQ-R total score significantly improved within 3 weeks of using the self-guided digital ACT app.
• The use of digital ACT also demonstrated positive effects on the levels of weekly pain intensity (P = .001) and depression (P < .0001), compared with the control group.
• No serious adverse effects related to the app were reported, and both groups demonstrated high rates of adherence, with most (72%) participants in the digital ACT group completing at least 42 sessions.

IN PRACTICE:

“The results found in the study are essential for professionals who care for patients with fibromyalgia as they present a new viable treatment alternative,” Guilherme Torres Vilarino, PhD, Santa Catarina State University, Florianópolis, Brazil, wrote in an accompanying editorial.

SOURCE:

This study was led by R. Michael Gendreau, MD, PhD, Gendreau Consulting, Poway, California. It was published online  in The Lancet.

LIMITATIONS:

The study population predominantly consisted of women and White individuals, which may limit the generalizability of the findings to more diverse populations. Additionally, the study was conducted in the United States, and the results may thus not be applicable to other countries with different racial, ethnic, educational, and economic characteristics. The study duration was 12 weeks, and the long-term benefits of digital ACT have not yet been shown.

DISCLOSURES:

This study was funded by Swing Therapeutics. Seven authors declared having stock options and/or receiving salary from Swing Therapeutics. Other authors reported having many ties with several sources, including Swing Therapeutics.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article first appeared on Medscape.com.

TOPLINE:

A smartphone app that delivers acceptance and commitment therapy (ACT), a type of cognitive behavioral therapy, improves overall well-being and reduces the severity of pain, fatigue, sleep issues, and depression to a greater extent than daily symptom tracking in patients with fibromyalgia.

METHODOLOGY:

• Researchers conducted the phase 3 PROSPER-FM trial at 25 community sites in the United States to assess the efficacy and safety of digital ACT for patients with fibromyalgia.
• A total of 275 adult patients aged 22-75 years with fibromyalgia were randomly assigned to either the digital ACT group (n = 140) or the active control group (n = 135) for 12 weeks.
• Patients in the digital ACT group received a self-guided, smartphone-delivered program in which they learned and practiced the core ACT skills of acceptance, values, mindfulness, defusion, self as context, and willingness and committed action to build psychological flexibility, while the control group underwent daily symptom tracking and received educational materials.
• The primary endpoint was the response rate on the Patient Global Impression of Change (PGIC) at week 12, which is an indicator of patient well-being.
• The secondary endpoints included changes in the Revised Fibromyalgia Impact Questionnaire (FIQ-R) total score and pain intensity, pain interference, and sleep interference scores.

TAKEAWAY:

• At week 12, 71% of the patients in the digital ACT group responded with a minimally improved or better change in the PGIC response, compared with only 22% of the patients in the control group (P < .0001).
• The digital ACT group showed a significant reduction in the impact of fibromyalgia, with a between-group effect size of d = 0.65 (P < .0001) at week 12. The FIQ-R total score significantly improved within 3 weeks of using the self-guided digital ACT app.
• The use of digital ACT also demonstrated positive effects on the levels of weekly pain intensity (P = .001) and depression (P < .0001), compared with the control group.
• No serious adverse effects related to the app were reported, and both groups demonstrated high rates of adherence, with most (72%) participants in the digital ACT group completing at least 42 sessions.

IN PRACTICE:

“The results found in the study are essential for professionals who care for patients with fibromyalgia as they present a new viable treatment alternative,” Guilherme Torres Vilarino, PhD, Santa Catarina State University, Florianópolis, Brazil, wrote in an accompanying editorial.

SOURCE:

This study was led by R. Michael Gendreau, MD, PhD, Gendreau Consulting, Poway, California. It was published online  in The Lancet.

LIMITATIONS:

The study population predominantly consisted of women and White individuals, which may limit the generalizability of the findings to more diverse populations. Additionally, the study was conducted in the United States, and the results may thus not be applicable to other countries with different racial, ethnic, educational, and economic characteristics. The study duration was 12 weeks, and the long-term benefits of digital ACT have not yet been shown.

DISCLOSURES:

This study was funded by Swing Therapeutics. Seven authors declared having stock options and/or receiving salary from Swing Therapeutics. Other authors reported having many ties with several sources, including Swing Therapeutics.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication. A version of this article first appeared on Medscape.com.

WASHINGTON — Advancing treatment for what has been variably called chronic Lyme and posttreatment Lyme disease (PTLD) is under the eyes of a National Academies of Science, Engineering, and Medicine (NASEM) committee of experts for the first time — a year after the NASEM shone a spotlight on the need to accelerate research on chronic illnesses that follow known or suspected infections.

The committee will not make recommendations on specific approaches to diagnosis and treatment when it issues a report in early 2025 but will instead present “consensus findings” on treatment for chronic illness associated with Lyme disease, including recommendations for advancing treatment.

There have been only a few randomized controlled trials (RCTs) conducted on what the committee is calling Lyme Infection-Associated Chronic Illness (Lyme IACI) for now, and no National Institutes of Health (NIH)-funded RCTs in the past 20 years or so. It’s an area void of the US Food and Drug Administration–approved therapies, void of any consensus on the off-label use of medications, and without any current standard of care or proven mechanisms and pathophysiology, said John Aucott, MD, director of the Johns Hopkins Medicine Lyme Disease Clinical Research Center, Baltimore, one of the invited speakers at a public meeting held by the NASEM in Washington, DC.

“The best way to look at this illness is not from the silos of infectious disease or the silos of rheumatology; you have to look across disciplines,” Dr. Aucott, also associate professor of medicine in the Division of Rheumatology, told the committee. “The story doesn’t fit anything I trained for in my infectious disease fellowship. Even today, I’d posit that PTLD is like an island — it’s still not connected to a lot of the mainstream of medicine.”

Rhisa Parera, who wrote and directed a 2021 documentary, Your Labs Are Normal, was one of several invited speakers who amplified the patient voice. Starting around age 7, she had pain in her knees, spine, and hips and vivid nightmares. In high school, she developed gastrointestinal issues, and in college, she developed debilitating neurologic symptoms.

Depression was her eventual diagnosis after having seen “every specialist in the book,” she said. At age 29, she received a positive western blot test and a Lyme disease diagnosis, at which point “I was prescribed 4 weeks of doxycycline and left in the dark,” the 34-year-old Black patient told the committee. Her health improved only after she began working with an “LLMD,” or Lyme-literate medical doctor (a term used in the patient community), while she lived with her mother and did not work, she said.

“I don’t share my Lyme disease history with other doctors. It’s pointless when you have those who will laugh at you, say you’re fine if you were treated, or just deny the disease completely,” Ms. Parera said. “We need this to be taught in medical school. It’s a literal emergency.”
 

Incidence and Potential Mechanisms

Limited research has suggested that 10%-20% of patients with Lyme disease develop persistent symptoms after standard antibiotic treatment advised by the Infectious Diseases Society of America (IDSA), Dr. Aucott said. (On its web page on chronic symptoms, the Centers for Disease Control and Prevention presents a more conservative range of 5%-10%.)

His own prospective cohort study at Johns Hopkins, published in 2022, found that 13.7% of 234 patients with prior Lyme disease met symptom and functional impact criteria for PTLD, compared with 4.1% of 49 participants without a history of Lyme disease — a statistically significant difference that he said should “put to rest” the question of “is it real?”

PTLD is the research case definition proposed by the IDSA in 2006; it requires that patients have prior documented Lyme disease, no other specific comorbidities, and specific symptoms (fatigue, widespread musculoskeletal pain, and/or cognitive difficulties) causing significant functional impact at least 6 months from their initial diagnosis and treatment.

In the real world, however, where diagnostics for acute Lyme disease are often inaccurate, erythema migrans is often absent, and the symptomatology of Lyme IACI is variable (and where there is no approved laboratory test or objective biomarker for diagnosing Lyme IACI), PTLD represents only a subset of a broader, heterogeneous population with persistent symptoms.

The term “Lyme IACI,” pronounced “Lyme eye-ACK-ee” at the meeting, builds on conversations at the 2023 NASEM workshop on infection-associated chronic illnesses and “encompasses a variety of terms that are used,” including PTLD, PTLD syndrome, persistent Lyme disease, and chronic Lyme disease, according to committee documents. Symptoms are distinct from the known complications of Lyme disease, such as arthritis or carditis.

The findings from Dr. Aucott’s SLICE cohort likely represent “the best outcome,” he said. They’re “probably not generalizable to a community setting where we see lots of missed diagnoses and delayed diagnoses,” as well as other tick-borne coinfections.

One of the challenges in designing future trials, in fact, relates to enrollment criteria and whether to use strict inclusion and exclusion criteria associated with the IDSA definition or take a broader approach to trial enrollment, he and others said. “You want to enroll patients for whom there’s no controversy that they’ve had Lyme infection ... for a study people believe in,” Dr. Aucott said during a discussion period, noting that it’s typical to screen over 100 patients to find one enrollee. “But it’s a tension we’re having.”

Timothy Sellati, PhD, chief scientific officer of the Global Lyme Alliance, urged change. “It’s really important to try to figure out how to alter our thinking on identifying and diagnosing chronic Lyme patients because they need to be recruited into clinical trials,” he said during his presentation.

“We think the best way to do this is to [develop and] employ composite diagnostic testing” that looks at unique Borrelia signatures (eg, protein, DNA, RNA, or metabolites), genetic and/or epigenetic signatures, inflammation signatures, T-cell-independent antibody signatures, and other elements, Dr. Sellati said.

Researchers designing treatment trials also face unknowns, Dr. Aucott and others said, about the role of potential mechanisms of Lyme IACI, from persistent Borrelia burgdorferi (or Borrelia mayonii) infection or the persistence of bacterial remnants (eg, nucleic acids or peptidoglycans) to infection-triggered pathology such as persistent immune dysregulation, chronic inflammation, autoimmunity, microbiome alterations, and dysautonomia and other neural network alterations.

The NASEM’s spotlight on Lyme IACI follows its long COVID-driven push last year to advance a common research agenda in infection-associated chronic illnesses. Investigators see common symptoms and potential shared mechanisms between long COVID, Lyme IACI, myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), and other complex chronic illnesses following infections.

At the Lyme IACI meeting, invited speakers described parts of the research landscape. Avindra Nath, MD, of the National Institute of Neurological Disorders and Stroke, for instance, described a recently published deep phenotyping study of 17 patients with ME/CFS that found decreased central catecholamine synthesis, circuit dysfunction of integrative brain regions, and immune profiling differences (eg, defects in B-cell maturation or T-cell exhaustion), compared with matched controls, that suggest the persistence of microbial antigens.

And John Leong, MD, PhD, of Tufts University, Boston, described his lab’s focus on understanding the microbe-host interactions that enable bloodstream dissemination and tissue invasion of B burgdorferi to take hold, increasing the risk for persistent symptoms. Other research at Tufts, he noted during a discussion period, has demonstrated the persistence of B burgdorferi to antibiotics in microtiter dishes. “Those organisms that survive are really difficult to eradicate in vitro,” Dr. Leong said.

Other physician investigators described research on nociplastic pain — a category of pain that can be triggered by infections, causing both amplified sensory processing and augmented central nervous system pain — and on whether reactivation of the Epstein-Barr virus could potentiate autoimmunity in the context of Borrelia infection.

Researchers are ready to test therapies while pathophysiology is unraveled — provided there is funding, Dr. Aucott said. The Clinical Trials Network for Lyme and Other Tick-Borne Diseases, coordinated by Brian Fallon, MD, of Columbia University, New York City, and funded several years ago by the Steven & Alexandra Cohen Foundation, has a slate of small pilot studies underway or being planned that address potential mechanisms (eg, studies of pulse intravenous ceftriaxone, tetracycline, transauricular vagus nerve stimulation, and mast cell modulation). And should full multisite trials be designed and funded, the network is ready with an infrastructure.
 

Need for Patient-Centered Outcomes

Persistent symptomatology is on the NIH’s radar screen. Efforts to understand causes were part of a strategic tick-borne disease research plan developed by the NIH in 2019. And in 2023, the National Institute of Allergy and Infectious Diseases (NIAID) funded seven projects addressing persistent symptoms that will run through 2028, C. Benjamin Beard, PhD, deputy division director of the CDC’s Division of Vector-Borne Disease, said at the NASEM committee meeting.

Patient advocates maintained that too much emphasis is placed on tick biology and pathophysiology. When Wendy Adams, research grant director and advisory board member of the Bay Area Lyme Foundation, and a colleague analyzed NIAID tick-borne disease funding from 2013 to 2021, they found that 75% of the funding went toward basic research, 15% to translational research, and “only 3% went to clinical research,” Ms. Adams told the committee.

Only 3% of the basic research budget was spent on coinfections, she said, and only 1% was spent on neurologic disease associated with tick-borne infections, both of which are survey-defined patient priorities. Moreover, “12% of the overall NIAID [tick-borne diseases] budget was spent on tick biology,” she said.

Research needs to involve community physicians who are utilizing the guidelines and approaches of the International Lyme and Associated Diseases Society to treat most patients with Lyme IACI, Ms. Adams said. “They have data to be mined,” she said, as does LymeDisease.org, which maintains a patient registry, MyLymeData, with over 18,000 patients. The organization has published two treatment studies, including one on antibiotic treatment response.

Lorraine Johnson, JD, MBA, CEO of LymeDisease.org and principal investigator of MyLymeData, stressed the importance of using patient-centered outcomes that incorporate minimal clinically important differences (MCIDs). “A change in the SF-36 score [without consideration of MCIDs] is not inherently important or meaningful to patients,” she said, referring to the SF-36 survey of health-related quality of life.

“This may seem like an esoteric issue, but two of the four clinical trials done [on retreatment of] persistent Lyme disease used the SF-36 as their outcome measure, and those studies, led by [Mark] Klempner, concluded that retreatment was not effective,” Ms. Johnson said. “Patients have been and continue to be harmed by [this research] because they’re told by physicians that antibiotics don’t work.”

A 2012 biostatistical review of these four RCTs — trials that helped inform the 2006 IDSA treatment guidelines — concluded that the Klempner studies “set the bar for treatment success too high,” Ms. Johnson said. Three of the four trials were likely underpowered to detect clinically meaningful treatment effects, the review also found.

The NASEM committee will hold additional public meetings and review a wide range of literature through this year. The formation of the committee was recommended by the US Department of Health and Human Services Tick-Borne Disease Working Group that was established by Congress in 2016 and concluded its work in 2022. The committee’s work is funded by the Cohen Foundation.
 

A version of this article appeared on Medscape.com.

WASHINGTON — Advancing treatment for what has been variably called chronic Lyme and posttreatment Lyme disease (PTLD) is under the eyes of a National Academies of Science, Engineering, and Medicine (NASEM) committee of experts for the first time — a year after the NASEM shone a spotlight on the need to accelerate research on chronic illnesses that follow known or suspected infections.

The committee will not make recommendations on specific approaches to diagnosis and treatment when it issues a report in early 2025 but will instead present “consensus findings” on treatment for chronic illness associated with Lyme disease, including recommendations for advancing treatment.

There have been only a few randomized controlled trials (RCTs) conducted on what the committee is calling Lyme Infection-Associated Chronic Illness (Lyme IACI) for now, and no National Institutes of Health (NIH)-funded RCTs in the past 20 years or so. It’s an area void of the US Food and Drug Administration–approved therapies, void of any consensus on the off-label use of medications, and without any current standard of care or proven mechanisms and pathophysiology, said John Aucott, MD, director of the Johns Hopkins Medicine Lyme Disease Clinical Research Center, Baltimore, one of the invited speakers at a public meeting held by the NASEM in Washington, DC.

“The best way to look at this illness is not from the silos of infectious disease or the silos of rheumatology; you have to look across disciplines,” Dr. Aucott, also associate professor of medicine in the Division of Rheumatology, told the committee. “The story doesn’t fit anything I trained for in my infectious disease fellowship. Even today, I’d posit that PTLD is like an island — it’s still not connected to a lot of the mainstream of medicine.”

Rhisa Parera, who wrote and directed a 2021 documentary, Your Labs Are Normal, was one of several invited speakers who amplified the patient voice. Starting around age 7, she had pain in her knees, spine, and hips and vivid nightmares. In high school, she developed gastrointestinal issues, and in college, she developed debilitating neurologic symptoms.

Depression was her eventual diagnosis after having seen “every specialist in the book,” she said. At age 29, she received a positive western blot test and a Lyme disease diagnosis, at which point “I was prescribed 4 weeks of doxycycline and left in the dark,” the 34-year-old Black patient told the committee. Her health improved only after she began working with an “LLMD,” or Lyme-literate medical doctor (a term used in the patient community), while she lived with her mother and did not work, she said.

“I don’t share my Lyme disease history with other doctors. It’s pointless when you have those who will laugh at you, say you’re fine if you were treated, or just deny the disease completely,” Ms. Parera said. “We need this to be taught in medical school. It’s a literal emergency.”
 

Incidence and Potential Mechanisms

Limited research has suggested that 10%-20% of patients with Lyme disease develop persistent symptoms after standard antibiotic treatment advised by the Infectious Diseases Society of America (IDSA), Dr. Aucott said. (On its web page on chronic symptoms, the Centers for Disease Control and Prevention presents a more conservative range of 5%-10%.)

His own prospective cohort study at Johns Hopkins, published in 2022, found that 13.7% of 234 patients with prior Lyme disease met symptom and functional impact criteria for PTLD, compared with 4.1% of 49 participants without a history of Lyme disease — a statistically significant difference that he said should “put to rest” the question of “is it real?”

PTLD is the research case definition proposed by the IDSA in 2006; it requires that patients have prior documented Lyme disease, no other specific comorbidities, and specific symptoms (fatigue, widespread musculoskeletal pain, and/or cognitive difficulties) causing significant functional impact at least 6 months from their initial diagnosis and treatment.

In the real world, however, where diagnostics for acute Lyme disease are often inaccurate, erythema migrans is often absent, and the symptomatology of Lyme IACI is variable (and where there is no approved laboratory test or objective biomarker for diagnosing Lyme IACI), PTLD represents only a subset of a broader, heterogeneous population with persistent symptoms.

The term “Lyme IACI,” pronounced “Lyme eye-ACK-ee” at the meeting, builds on conversations at the 2023 NASEM workshop on infection-associated chronic illnesses and “encompasses a variety of terms that are used,” including PTLD, PTLD syndrome, persistent Lyme disease, and chronic Lyme disease, according to committee documents. Symptoms are distinct from the known complications of Lyme disease, such as arthritis or carditis.

The findings from Dr. Aucott’s SLICE cohort likely represent “the best outcome,” he said. They’re “probably not generalizable to a community setting where we see lots of missed diagnoses and delayed diagnoses,” as well as other tick-borne coinfections.

One of the challenges in designing future trials, in fact, relates to enrollment criteria and whether to use strict inclusion and exclusion criteria associated with the IDSA definition or take a broader approach to trial enrollment, he and others said. “You want to enroll patients for whom there’s no controversy that they’ve had Lyme infection ... for a study people believe in,” Dr. Aucott said during a discussion period, noting that it’s typical to screen over 100 patients to find one enrollee. “But it’s a tension we’re having.”

Timothy Sellati, PhD, chief scientific officer of the Global Lyme Alliance, urged change. “It’s really important to try to figure out how to alter our thinking on identifying and diagnosing chronic Lyme patients because they need to be recruited into clinical trials,” he said during his presentation.

“We think the best way to do this is to [develop and] employ composite diagnostic testing” that looks at unique Borrelia signatures (eg, protein, DNA, RNA, or metabolites), genetic and/or epigenetic signatures, inflammation signatures, T-cell-independent antibody signatures, and other elements, Dr. Sellati said.

Researchers designing treatment trials also face unknowns, Dr. Aucott and others said, about the role of potential mechanisms of Lyme IACI, from persistent Borrelia burgdorferi (or Borrelia mayonii) infection or the persistence of bacterial remnants (eg, nucleic acids or peptidoglycans) to infection-triggered pathology such as persistent immune dysregulation, chronic inflammation, autoimmunity, microbiome alterations, and dysautonomia and other neural network alterations.

The NASEM’s spotlight on Lyme IACI follows its long COVID-driven push last year to advance a common research agenda in infection-associated chronic illnesses. Investigators see common symptoms and potential shared mechanisms between long COVID, Lyme IACI, myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), and other complex chronic illnesses following infections.

At the Lyme IACI meeting, invited speakers described parts of the research landscape. Avindra Nath, MD, of the National Institute of Neurological Disorders and Stroke, for instance, described a recently published deep phenotyping study of 17 patients with ME/CFS that found decreased central catecholamine synthesis, circuit dysfunction of integrative brain regions, and immune profiling differences (eg, defects in B-cell maturation or T-cell exhaustion), compared with matched controls, that suggest the persistence of microbial antigens.

And John Leong, MD, PhD, of Tufts University, Boston, described his lab’s focus on understanding the microbe-host interactions that enable bloodstream dissemination and tissue invasion of B burgdorferi to take hold, increasing the risk for persistent symptoms. Other research at Tufts, he noted during a discussion period, has demonstrated the persistence of B burgdorferi to antibiotics in microtiter dishes. “Those organisms that survive are really difficult to eradicate in vitro,” Dr. Leong said.

Other physician investigators described research on nociplastic pain — a category of pain that can be triggered by infections, causing both amplified sensory processing and augmented central nervous system pain — and on whether reactivation of the Epstein-Barr virus could potentiate autoimmunity in the context of Borrelia infection.

Researchers are ready to test therapies while pathophysiology is unraveled — provided there is funding, Dr. Aucott said. The Clinical Trials Network for Lyme and Other Tick-Borne Diseases, coordinated by Brian Fallon, MD, of Columbia University, New York City, and funded several years ago by the Steven & Alexandra Cohen Foundation, has a slate of small pilot studies underway or being planned that address potential mechanisms (eg, studies of pulse intravenous ceftriaxone, tetracycline, transauricular vagus nerve stimulation, and mast cell modulation). And should full multisite trials be designed and funded, the network is ready with an infrastructure.
 

Need for Patient-Centered Outcomes

Persistent symptomatology is on the NIH’s radar screen. Efforts to understand causes were part of a strategic tick-borne disease research plan developed by the NIH in 2019. And in 2023, the National Institute of Allergy and Infectious Diseases (NIAID) funded seven projects addressing persistent symptoms that will run through 2028, C. Benjamin Beard, PhD, deputy division director of the CDC’s Division of Vector-Borne Disease, said at the NASEM committee meeting.

Patient advocates maintained that too much emphasis is placed on tick biology and pathophysiology. When Wendy Adams, research grant director and advisory board member of the Bay Area Lyme Foundation, and a colleague analyzed NIAID tick-borne disease funding from 2013 to 2021, they found that 75% of the funding went toward basic research, 15% to translational research, and “only 3% went to clinical research,” Ms. Adams told the committee.

Only 3% of the basic research budget was spent on coinfections, she said, and only 1% was spent on neurologic disease associated with tick-borne infections, both of which are survey-defined patient priorities. Moreover, “12% of the overall NIAID [tick-borne diseases] budget was spent on tick biology,” she said.

Research needs to involve community physicians who are utilizing the guidelines and approaches of the International Lyme and Associated Diseases Society to treat most patients with Lyme IACI, Ms. Adams said. “They have data to be mined,” she said, as does LymeDisease.org, which maintains a patient registry, MyLymeData, with over 18,000 patients. The organization has published two treatment studies, including one on antibiotic treatment response.

Lorraine Johnson, JD, MBA, CEO of LymeDisease.org and principal investigator of MyLymeData, stressed the importance of using patient-centered outcomes that incorporate minimal clinically important differences (MCIDs). “A change in the SF-36 score [without consideration of MCIDs] is not inherently important or meaningful to patients,” she said, referring to the SF-36 survey of health-related quality of life.

“This may seem like an esoteric issue, but two of the four clinical trials done [on retreatment of] persistent Lyme disease used the SF-36 as their outcome measure, and those studies, led by [Mark] Klempner, concluded that retreatment was not effective,” Ms. Johnson said. “Patients have been and continue to be harmed by [this research] because they’re told by physicians that antibiotics don’t work.”

A 2012 biostatistical review of these four RCTs — trials that helped inform the 2006 IDSA treatment guidelines — concluded that the Klempner studies “set the bar for treatment success too high,” Ms. Johnson said. Three of the four trials were likely underpowered to detect clinically meaningful treatment effects, the review also found.

The NASEM committee will hold additional public meetings and review a wide range of literature through this year. The formation of the committee was recommended by the US Department of Health and Human Services Tick-Borne Disease Working Group that was established by Congress in 2016 and concluded its work in 2022. The committee’s work is funded by the Cohen Foundation.
 

A version of this article appeared on Medscape.com.

WASHINGTON — Advancing treatment for what has been variably called chronic Lyme and posttreatment Lyme disease (PTLD) is under the eyes of a National Academies of Science, Engineering, and Medicine (NASEM) committee of experts for the first time — a year after the NASEM shone a spotlight on the need to accelerate research on chronic illnesses that follow known or suspected infections.

The committee will not make recommendations on specific approaches to diagnosis and treatment when it issues a report in early 2025 but will instead present “consensus findings” on treatment for chronic illness associated with Lyme disease, including recommendations for advancing treatment.

There have been only a few randomized controlled trials (RCTs) conducted on what the committee is calling Lyme Infection-Associated Chronic Illness (Lyme IACI) for now, and no National Institutes of Health (NIH)-funded RCTs in the past 20 years or so. It’s an area void of the US Food and Drug Administration–approved therapies, void of any consensus on the off-label use of medications, and without any current standard of care or proven mechanisms and pathophysiology, said John Aucott, MD, director of the Johns Hopkins Medicine Lyme Disease Clinical Research Center, Baltimore, one of the invited speakers at a public meeting held by the NASEM in Washington, DC.

“The best way to look at this illness is not from the silos of infectious disease or the silos of rheumatology; you have to look across disciplines,” Dr. Aucott, also associate professor of medicine in the Division of Rheumatology, told the committee. “The story doesn’t fit anything I trained for in my infectious disease fellowship. Even today, I’d posit that PTLD is like an island — it’s still not connected to a lot of the mainstream of medicine.”

Rhisa Parera, who wrote and directed a 2021 documentary, Your Labs Are Normal, was one of several invited speakers who amplified the patient voice. Starting around age 7, she had pain in her knees, spine, and hips and vivid nightmares. In high school, she developed gastrointestinal issues, and in college, she developed debilitating neurologic symptoms.

Depression was her eventual diagnosis after having seen “every specialist in the book,” she said. At age 29, she received a positive western blot test and a Lyme disease diagnosis, at which point “I was prescribed 4 weeks of doxycycline and left in the dark,” the 34-year-old Black patient told the committee. Her health improved only after she began working with an “LLMD,” or Lyme-literate medical doctor (a term used in the patient community), while she lived with her mother and did not work, she said.

“I don’t share my Lyme disease history with other doctors. It’s pointless when you have those who will laugh at you, say you’re fine if you were treated, or just deny the disease completely,” Ms. Parera said. “We need this to be taught in medical school. It’s a literal emergency.”
 

Incidence and Potential Mechanisms

Limited research has suggested that 10%-20% of patients with Lyme disease develop persistent symptoms after standard antibiotic treatment advised by the Infectious Diseases Society of America (IDSA), Dr. Aucott said. (On its web page on chronic symptoms, the Centers for Disease Control and Prevention presents a more conservative range of 5%-10%.)

His own prospective cohort study at Johns Hopkins, published in 2022, found that 13.7% of 234 patients with prior Lyme disease met symptom and functional impact criteria for PTLD, compared with 4.1% of 49 participants without a history of Lyme disease — a statistically significant difference that he said should “put to rest” the question of “is it real?”

PTLD is the research case definition proposed by the IDSA in 2006; it requires that patients have prior documented Lyme disease, no other specific comorbidities, and specific symptoms (fatigue, widespread musculoskeletal pain, and/or cognitive difficulties) causing significant functional impact at least 6 months from their initial diagnosis and treatment.

In the real world, however, where diagnostics for acute Lyme disease are often inaccurate, erythema migrans is often absent, and the symptomatology of Lyme IACI is variable (and where there is no approved laboratory test or objective biomarker for diagnosing Lyme IACI), PTLD represents only a subset of a broader, heterogeneous population with persistent symptoms.

The term “Lyme IACI,” pronounced “Lyme eye-ACK-ee” at the meeting, builds on conversations at the 2023 NASEM workshop on infection-associated chronic illnesses and “encompasses a variety of terms that are used,” including PTLD, PTLD syndrome, persistent Lyme disease, and chronic Lyme disease, according to committee documents. Symptoms are distinct from the known complications of Lyme disease, such as arthritis or carditis.

The findings from Dr. Aucott’s SLICE cohort likely represent “the best outcome,” he said. They’re “probably not generalizable to a community setting where we see lots of missed diagnoses and delayed diagnoses,” as well as other tick-borne coinfections.

One of the challenges in designing future trials, in fact, relates to enrollment criteria and whether to use strict inclusion and exclusion criteria associated with the IDSA definition or take a broader approach to trial enrollment, he and others said. “You want to enroll patients for whom there’s no controversy that they’ve had Lyme infection ... for a study people believe in,” Dr. Aucott said during a discussion period, noting that it’s typical to screen over 100 patients to find one enrollee. “But it’s a tension we’re having.”

Timothy Sellati, PhD, chief scientific officer of the Global Lyme Alliance, urged change. “It’s really important to try to figure out how to alter our thinking on identifying and diagnosing chronic Lyme patients because they need to be recruited into clinical trials,” he said during his presentation.

“We think the best way to do this is to [develop and] employ composite diagnostic testing” that looks at unique Borrelia signatures (eg, protein, DNA, RNA, or metabolites), genetic and/or epigenetic signatures, inflammation signatures, T-cell-independent antibody signatures, and other elements, Dr. Sellati said.

Researchers designing treatment trials also face unknowns, Dr. Aucott and others said, about the role of potential mechanisms of Lyme IACI, from persistent Borrelia burgdorferi (or Borrelia mayonii) infection or the persistence of bacterial remnants (eg, nucleic acids or peptidoglycans) to infection-triggered pathology such as persistent immune dysregulation, chronic inflammation, autoimmunity, microbiome alterations, and dysautonomia and other neural network alterations.

The NASEM’s spotlight on Lyme IACI follows its long COVID-driven push last year to advance a common research agenda in infection-associated chronic illnesses. Investigators see common symptoms and potential shared mechanisms between long COVID, Lyme IACI, myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS), and other complex chronic illnesses following infections.

At the Lyme IACI meeting, invited speakers described parts of the research landscape. Avindra Nath, MD, of the National Institute of Neurological Disorders and Stroke, for instance, described a recently published deep phenotyping study of 17 patients with ME/CFS that found decreased central catecholamine synthesis, circuit dysfunction of integrative brain regions, and immune profiling differences (eg, defects in B-cell maturation or T-cell exhaustion), compared with matched controls, that suggest the persistence of microbial antigens.

And John Leong, MD, PhD, of Tufts University, Boston, described his lab’s focus on understanding the microbe-host interactions that enable bloodstream dissemination and tissue invasion of B burgdorferi to take hold, increasing the risk for persistent symptoms. Other research at Tufts, he noted during a discussion period, has demonstrated the persistence of B burgdorferi to antibiotics in microtiter dishes. “Those organisms that survive are really difficult to eradicate in vitro,” Dr. Leong said.

Other physician investigators described research on nociplastic pain — a category of pain that can be triggered by infections, causing both amplified sensory processing and augmented central nervous system pain — and on whether reactivation of the Epstein-Barr virus could potentiate autoimmunity in the context of Borrelia infection.

Researchers are ready to test therapies while pathophysiology is unraveled — provided there is funding, Dr. Aucott said. The Clinical Trials Network for Lyme and Other Tick-Borne Diseases, coordinated by Brian Fallon, MD, of Columbia University, New York City, and funded several years ago by the Steven & Alexandra Cohen Foundation, has a slate of small pilot studies underway or being planned that address potential mechanisms (eg, studies of pulse intravenous ceftriaxone, tetracycline, transauricular vagus nerve stimulation, and mast cell modulation). And should full multisite trials be designed and funded, the network is ready with an infrastructure.
 

Need for Patient-Centered Outcomes

Persistent symptomatology is on the NIH’s radar screen. Efforts to understand causes were part of a strategic tick-borne disease research plan developed by the NIH in 2019. And in 2023, the National Institute of Allergy and Infectious Diseases (NIAID) funded seven projects addressing persistent symptoms that will run through 2028, C. Benjamin Beard, PhD, deputy division director of the CDC’s Division of Vector-Borne Disease, said at the NASEM committee meeting.

Patient advocates maintained that too much emphasis is placed on tick biology and pathophysiology. When Wendy Adams, research grant director and advisory board member of the Bay Area Lyme Foundation, and a colleague analyzed NIAID tick-borne disease funding from 2013 to 2021, they found that 75% of the funding went toward basic research, 15% to translational research, and “only 3% went to clinical research,” Ms. Adams told the committee.

Only 3% of the basic research budget was spent on coinfections, she said, and only 1% was spent on neurologic disease associated with tick-borne infections, both of which are survey-defined patient priorities. Moreover, “12% of the overall NIAID [tick-borne diseases] budget was spent on tick biology,” she said.

Research needs to involve community physicians who are utilizing the guidelines and approaches of the International Lyme and Associated Diseases Society to treat most patients with Lyme IACI, Ms. Adams said. “They have data to be mined,” she said, as does LymeDisease.org, which maintains a patient registry, MyLymeData, with over 18,000 patients. The organization has published two treatment studies, including one on antibiotic treatment response.

Lorraine Johnson, JD, MBA, CEO of LymeDisease.org and principal investigator of MyLymeData, stressed the importance of using patient-centered outcomes that incorporate minimal clinically important differences (MCIDs). “A change in the SF-36 score [without consideration of MCIDs] is not inherently important or meaningful to patients,” she said, referring to the SF-36 survey of health-related quality of life.

“This may seem like an esoteric issue, but two of the four clinical trials done [on retreatment of] persistent Lyme disease used the SF-36 as their outcome measure, and those studies, led by [Mark] Klempner, concluded that retreatment was not effective,” Ms. Johnson said. “Patients have been and continue to be harmed by [this research] because they’re told by physicians that antibiotics don’t work.”

A 2012 biostatistical review of these four RCTs — trials that helped inform the 2006 IDSA treatment guidelines — concluded that the Klempner studies “set the bar for treatment success too high,” Ms. Johnson said. Three of the four trials were likely underpowered to detect clinically meaningful treatment effects, the review also found.

The NASEM committee will hold additional public meetings and review a wide range of literature through this year. The formation of the committee was recommended by the US Department of Health and Human Services Tick-Borne Disease Working Group that was established by Congress in 2016 and concluded its work in 2022. The committee’s work is funded by the Cohen Foundation.
 

A version of this article appeared on Medscape.com.

Moderate exercise in midlife is associated with a reduced risk for amyotrophic lateral sclerosis (ALS) later in life, but this benefit appears to be limited to men, findings from a large prospective study showed.

Men who reported moderate levels of physical activity had a 29% lower risk for ALS, whereas those with high levels of physical activity had a 41% lower risk for the disease.

The findings were published online in Neurology.
 

Conflicting Findings

Several famous athletes have died of ALS, including the baseball player Lou Gehrig (for whom the disease is named), football players Dwight Clark, Steve Gleason, and Kevin Turner, and the boxer Ezzard Charles. This has led some scientists to speculate that intense physical activity may play a role in the development of the disease.

Anders M. Vaage, MD, noted there have been conflicting findings in previous studies on the topic, with results showing both increased and reduced ALS risks with increasing levels of physical activity.

In one study, researchers followed more than 212,000 Swedish cross-country skiers and more than 500,000 Swedish individuals in the general population for 20 years and found that strenuous cross-country skiing was associated with a higher risk for ALS but only among the best skiers; recreational skiers appeared to have a reduced risk.

“Our study does not necessarily contradict previous studies with findings of an increased ALS risk with extreme or intense levels of physical activity in athletes, as this study reflects more moderate levels of physical activity and fitness in the total population,” said Dr. Vaage.

To further explore the association, the researchers followed 373,700 individuals who participated in a cardiovascular health survey for an average of 27 years. When the survey began, most participants were 40-42 years old.

Participants were followed until the date of ALS diagnosis, ALS death, death from other causes, emigration, or the end of study in August 2021.

Participants answered questions about physical activity levels, smoking status, and other issues relating to cardiovascular health, and participants’ resting heart rate was measured and divided into quartiles of 31-65 beats per minute (BPM), 66-74 BPM, 75-81 BPM, or 82-100 BPM.

Participants self-reported their physical activity over the past year, classifying it into one of four categories: Sedentary, at least 4 hours per week of walking or cycling, at least 4 hours per week of recreational sports or heavy gardening, or regular participation in intense training or sports competitions several times per week.

Only a few participants reported the highest level of physical activity, so researchers combined the third and fourth categories into a single high-activity group.

Of the total study cohort, 504 participants developed ALS. Of those who developed the disease, 59% were men.

Researchers found that of the 41,898 male participants with the highest level of physical activity, 63 developed ALS. In comparison, of the 76,769 male participants who reported an intermediate level of physical activity, 131 developed ALS. Among the 29,468 male participants who reported the lowest level of physical activity, 68 developed ALS.
 

No Link in Women?

After adjusting for smoking, body mass index, and other risk factors, investigators found that men with moderate physical activity levels had a 29% lower risk for ALS compared with those with low physical activity levels, whereas those with the highest activity levels had a 41% lower risk.

In addition, men in the lowest of the four categories of resting heart rate had a 32% reduced risk for ALS compared with men with a higher resting heart rate.

Investigators are unclear why there was a lack of association between physical activity and resting heart rate and ALS risk in women.

“There are known sex differences in ALS, which includes a sex ratio with male preponderance, and there are also sex differences in response to physical exercise. Perhaps underlying mechanisms herein can explain the difference observed between males and females in the study,” Dr. Vaage said. He noted that future research should explore this difference.

Study limitations included the absence of data on physical trauma and head trauma, which have been linked with increased ALS risk. In addition, there were no data on genotype.

In an accompanying editorial, Pamela Shaw, MD, and Johnathan Cooper-Knock, BMBCh, PhD, of the University of Sheffield, Sheffield, England, described the research as a “valuable contribution to the field and potentially provides some reassurance that mild/moderate levels of physical activity in middle age do not increase the risk for ALS but may instead have a beneficial protective effect.” 

Future research on exercise in ALS, they add, should consider sex differences, capture the most extreme physical activity levels, and identify any genetic factors that may mediate the association between intense exercise and ALS.

No targeted funding was reported. Dr. Vaage reported receiving funding from ALS Laboratory Group Norway.

A version of this article first appeared on Medscape.com.

Moderate exercise in midlife is associated with a reduced risk for amyotrophic lateral sclerosis (ALS) later in life, but this benefit appears to be limited to men, findings from a large prospective study showed.

Men who reported moderate levels of physical activity had a 29% lower risk for ALS, whereas those with high levels of physical activity had a 41% lower risk for the disease.

The findings were published online in Neurology.
 

Conflicting Findings

Several famous athletes have died of ALS, including the baseball player Lou Gehrig (for whom the disease is named), football players Dwight Clark, Steve Gleason, and Kevin Turner, and the boxer Ezzard Charles. This has led some scientists to speculate that intense physical activity may play a role in the development of the disease.

Anders M. Vaage, MD, noted there have been conflicting findings in previous studies on the topic, with results showing both increased and reduced ALS risks with increasing levels of physical activity.

In one study, researchers followed more than 212,000 Swedish cross-country skiers and more than 500,000 Swedish individuals in the general population for 20 years and found that strenuous cross-country skiing was associated with a higher risk for ALS but only among the best skiers; recreational skiers appeared to have a reduced risk.

“Our study does not necessarily contradict previous studies with findings of an increased ALS risk with extreme or intense levels of physical activity in athletes, as this study reflects more moderate levels of physical activity and fitness in the total population,” said Dr. Vaage.

To further explore the association, the researchers followed 373,700 individuals who participated in a cardiovascular health survey for an average of 27 years. When the survey began, most participants were 40-42 years old.

Participants were followed until the date of ALS diagnosis, ALS death, death from other causes, emigration, or the end of study in August 2021.

Participants answered questions about physical activity levels, smoking status, and other issues relating to cardiovascular health, and participants’ resting heart rate was measured and divided into quartiles of 31-65 beats per minute (BPM), 66-74 BPM, 75-81 BPM, or 82-100 BPM.

Participants self-reported their physical activity over the past year, classifying it into one of four categories: Sedentary, at least 4 hours per week of walking or cycling, at least 4 hours per week of recreational sports or heavy gardening, or regular participation in intense training or sports competitions several times per week.

Only a few participants reported the highest level of physical activity, so researchers combined the third and fourth categories into a single high-activity group.

Of the total study cohort, 504 participants developed ALS. Of those who developed the disease, 59% were men.

Researchers found that of the 41,898 male participants with the highest level of physical activity, 63 developed ALS. In comparison, of the 76,769 male participants who reported an intermediate level of physical activity, 131 developed ALS. Among the 29,468 male participants who reported the lowest level of physical activity, 68 developed ALS.
 

No Link in Women?

After adjusting for smoking, body mass index, and other risk factors, investigators found that men with moderate physical activity levels had a 29% lower risk for ALS compared with those with low physical activity levels, whereas those with the highest activity levels had a 41% lower risk.

In addition, men in the lowest of the four categories of resting heart rate had a 32% reduced risk for ALS compared with men with a higher resting heart rate.

Investigators are unclear why there was a lack of association between physical activity and resting heart rate and ALS risk in women.

“There are known sex differences in ALS, which includes a sex ratio with male preponderance, and there are also sex differences in response to physical exercise. Perhaps underlying mechanisms herein can explain the difference observed between males and females in the study,” Dr. Vaage said. He noted that future research should explore this difference.

Study limitations included the absence of data on physical trauma and head trauma, which have been linked with increased ALS risk. In addition, there were no data on genotype.

In an accompanying editorial, Pamela Shaw, MD, and Johnathan Cooper-Knock, BMBCh, PhD, of the University of Sheffield, Sheffield, England, described the research as a “valuable contribution to the field and potentially provides some reassurance that mild/moderate levels of physical activity in middle age do not increase the risk for ALS but may instead have a beneficial protective effect.” 

Future research on exercise in ALS, they add, should consider sex differences, capture the most extreme physical activity levels, and identify any genetic factors that may mediate the association between intense exercise and ALS.

No targeted funding was reported. Dr. Vaage reported receiving funding from ALS Laboratory Group Norway.

A version of this article first appeared on Medscape.com.

Moderate exercise in midlife is associated with a reduced risk for amyotrophic lateral sclerosis (ALS) later in life, but this benefit appears to be limited to men, findings from a large prospective study showed.

Men who reported moderate levels of physical activity had a 29% lower risk for ALS, whereas those with high levels of physical activity had a 41% lower risk for the disease.

The findings were published online in Neurology.
 

Conflicting Findings

Several famous athletes have died of ALS, including the baseball player Lou Gehrig (for whom the disease is named), football players Dwight Clark, Steve Gleason, and Kevin Turner, and the boxer Ezzard Charles. This has led some scientists to speculate that intense physical activity may play a role in the development of the disease.

Anders M. Vaage, MD, noted there have been conflicting findings in previous studies on the topic, with results showing both increased and reduced ALS risks with increasing levels of physical activity.

In one study, researchers followed more than 212,000 Swedish cross-country skiers and more than 500,000 Swedish individuals in the general population for 20 years and found that strenuous cross-country skiing was associated with a higher risk for ALS but only among the best skiers; recreational skiers appeared to have a reduced risk.

“Our study does not necessarily contradict previous studies with findings of an increased ALS risk with extreme or intense levels of physical activity in athletes, as this study reflects more moderate levels of physical activity and fitness in the total population,” said Dr. Vaage.

To further explore the association, the researchers followed 373,700 individuals who participated in a cardiovascular health survey for an average of 27 years. When the survey began, most participants were 40-42 years old.

Participants were followed until the date of ALS diagnosis, ALS death, death from other causes, emigration, or the end of study in August 2021.

Participants answered questions about physical activity levels, smoking status, and other issues relating to cardiovascular health, and participants’ resting heart rate was measured and divided into quartiles of 31-65 beats per minute (BPM), 66-74 BPM, 75-81 BPM, or 82-100 BPM.

Participants self-reported their physical activity over the past year, classifying it into one of four categories: Sedentary, at least 4 hours per week of walking or cycling, at least 4 hours per week of recreational sports or heavy gardening, or regular participation in intense training or sports competitions several times per week.

Only a few participants reported the highest level of physical activity, so researchers combined the third and fourth categories into a single high-activity group.

Of the total study cohort, 504 participants developed ALS. Of those who developed the disease, 59% were men.

Researchers found that of the 41,898 male participants with the highest level of physical activity, 63 developed ALS. In comparison, of the 76,769 male participants who reported an intermediate level of physical activity, 131 developed ALS. Among the 29,468 male participants who reported the lowest level of physical activity, 68 developed ALS.
 

No Link in Women?

After adjusting for smoking, body mass index, and other risk factors, investigators found that men with moderate physical activity levels had a 29% lower risk for ALS compared with those with low physical activity levels, whereas those with the highest activity levels had a 41% lower risk.

In addition, men in the lowest of the four categories of resting heart rate had a 32% reduced risk for ALS compared with men with a higher resting heart rate.

Investigators are unclear why there was a lack of association between physical activity and resting heart rate and ALS risk in women.

“There are known sex differences in ALS, which includes a sex ratio with male preponderance, and there are also sex differences in response to physical exercise. Perhaps underlying mechanisms herein can explain the difference observed between males and females in the study,” Dr. Vaage said. He noted that future research should explore this difference.

Study limitations included the absence of data on physical trauma and head trauma, which have been linked with increased ALS risk. In addition, there were no data on genotype.

In an accompanying editorial, Pamela Shaw, MD, and Johnathan Cooper-Knock, BMBCh, PhD, of the University of Sheffield, Sheffield, England, described the research as a “valuable contribution to the field and potentially provides some reassurance that mild/moderate levels of physical activity in middle age do not increase the risk for ALS but may instead have a beneficial protective effect.” 

Future research on exercise in ALS, they add, should consider sex differences, capture the most extreme physical activity levels, and identify any genetic factors that may mediate the association between intense exercise and ALS.

No targeted funding was reported. Dr. Vaage reported receiving funding from ALS Laboratory Group Norway.

A version of this article first appeared on Medscape.com.

HELSINKI, FINLAND — A new gene for early-onset Parkinson’s disease has been identified, a discovery that experts believe will have important clinical implications in the not-too-distant future.

A variant in PMSF1, a proteasome regulator, was identified in 15 families from 13 countries around the world, with 22 affected individuals.

“These families were ethnically diverse, and in all of them, the variant in PMSF1 correlated with the neurologic phenotype. We know this is very clear cut — the genotype/phenotype correlation — with the patients carrying the missense mutation having ‘mild’ symptoms, while those with the progressive loss-of-function variant had the most severe phenotype,” she noted. 

“Our findings unequivocally link defective PSMF1 to early-onset PD and neurodegeneration and suggest mitochondrial dysfunction as a mechanistic contributor,” study investigator Francesca Magrinelli, MD, PhD, of University College London (UCL) Queen Square Institute of Neurology, UCL, London, told delegates at the 2024 Congress of the European Academy of Neurology.
 

Managing Patient Expectations

Those “mildly” affected had an early-onset Parkinson’s disease starting between the second and fifth decade of life with pyramidal tract signs, dysphasia, psychiatric comorbidity, and early levodopa-induced dyskinesia. 

In those with the intermediate type, Parkinson’s disease symptoms start in childhood and include, among other things, global hypokinesia, developmental delay, cerebellar signs, and in some, associated epilepsy.

In most cases, there was evidence on brain MRI of a hypoplasia of the corpus callosum, Dr. Magrinelli said. In the most severely affected individuals, there was perinatal lethality with neurologic manifestations.

While it may seem that the genetics of Parkinson’s disease is an academic exercise for the most part, it won’t be too much longer before it yields practical information that will inform how patients are treated, said Parkinson’s disease expert Christine Klein, MD, of the Institute of Neurogenetics and Department of Neurology, University of Lübeck, Helsinki, Finland. 

The genetics of Parkinson’s disease are complicated, even within a single family. So, it’s very important to assess the pathogenicity of different variants, Dr. Klein noted. 

“I am sure that you have all had a Parkinson’s disease [gene] panel back, and it says, ‘variant of uncertain significance.’ This is the worst thing that can happen. The lab does not know what it means. You don’t know what it means, and you don’t know what to tell the patient. So how do you get around this?”

Dr. Klein said that before conducting any genetic testing, clinicians should inform the patient that they may have a genetic variant of uncertain significance. It doesn’t solve the problem, but it does help physicians manage patient expectations. 
 

Clinical Relevance on the Way?

While it may seem that all of the identified variants that predict Parkinson’s disease which, in addition to PSMF1, include the well-established LRRK2 and GBA1, may look the same, this is not true when patient history is taken into account, said Dr. Klein.

For example, age-of-onset of Parkinson’s disease can differ between identified variants, and this has led to “a paradigm change” whereby a purely genetic finding is called a disease. 

This first occurred in Huntington’s disease, when researchers gave individuals at high genetic risk of developing the illness, but who currently had no clinical symptoms, the label of “Stage Zero disease.”

This is important to note “because if we get to the stage of having drugs that can slow down, or even prevent, progression to Parkinson’s disease, then it will be key to have patients we know are going to develop it to participate in clinical trials for such agents,” said Dr. Klein. 

She cited the example of a family that she recently encountered that had genetic test results that showed variants of unknown significance, so Dr. Klein had the family’s samples sent to a specialized lab in Dundee, Scotland, for further analysis.

“The biochemists found that this variant was indeed pathogenic, and kinase-activating, so this is very helpful and very important because there are now clinical trials in Parkinson’s disease with kinase inhibitors,” she noted. 

“If you think there is something else [over and above the finding of uncertain significance] in your Parkinson’s disease panel, and you are not happy with the genetic report, send it somewhere else,” Dr. Klein advised. 

“We will see a lot more patients with genetic Parkinson’s disease in the future,” she predicted, while citing two recent preliminary clinical trials that have shown some promise in terms of neuroprotection in patients with early Parkinson’s disease.

“It remains to be seen whether there will be light at the end of the tunnel,” she said, but it may soon be possible to find treatments that delay, or even prevent, Parkinson’s disease onset. 

Dr. Magrinelli reported receiving speaker’s honoraria from MJFF Edmond J. Safra Clinical Research Fellowship in Movement Disorders (Class of 2023), MJFF Edmond J. Safra Movement Disorders Research Career Development Award 2023 (Grant ID MJFF-023893), American Parkinson Disease Association (Research Grant 2024), and the David Blank Charitable Foundation. Dr. Klein reported being a medical advisor to Retromer Therapeutics, Takeda, and Centogene and speakers’ honoraria from Desitin and Bial.

A version of this article first appeared on Medscape.com.

HELSINKI, FINLAND — A new gene for early-onset Parkinson’s disease has been identified, a discovery that experts believe will have important clinical implications in the not-too-distant future.

A variant in PMSF1, a proteasome regulator, was identified in 15 families from 13 countries around the world, with 22 affected individuals.

“These families were ethnically diverse, and in all of them, the variant in PMSF1 correlated with the neurologic phenotype. We know this is very clear cut — the genotype/phenotype correlation — with the patients carrying the missense mutation having ‘mild’ symptoms, while those with the progressive loss-of-function variant had the most severe phenotype,” she noted. 

“Our findings unequivocally link defective PSMF1 to early-onset PD and neurodegeneration and suggest mitochondrial dysfunction as a mechanistic contributor,” study investigator Francesca Magrinelli, MD, PhD, of University College London (UCL) Queen Square Institute of Neurology, UCL, London, told delegates at the 2024 Congress of the European Academy of Neurology.
 

Managing Patient Expectations

Those “mildly” affected had an early-onset Parkinson’s disease starting between the second and fifth decade of life with pyramidal tract signs, dysphasia, psychiatric comorbidity, and early levodopa-induced dyskinesia. 

In those with the intermediate type, Parkinson’s disease symptoms start in childhood and include, among other things, global hypokinesia, developmental delay, cerebellar signs, and in some, associated epilepsy.

In most cases, there was evidence on brain MRI of a hypoplasia of the corpus callosum, Dr. Magrinelli said. In the most severely affected individuals, there was perinatal lethality with neurologic manifestations.

While it may seem that the genetics of Parkinson’s disease is an academic exercise for the most part, it won’t be too much longer before it yields practical information that will inform how patients are treated, said Parkinson’s disease expert Christine Klein, MD, of the Institute of Neurogenetics and Department of Neurology, University of Lübeck, Helsinki, Finland. 

The genetics of Parkinson’s disease are complicated, even within a single family. So, it’s very important to assess the pathogenicity of different variants, Dr. Klein noted. 

“I am sure that you have all had a Parkinson’s disease [gene] panel back, and it says, ‘variant of uncertain significance.’ This is the worst thing that can happen. The lab does not know what it means. You don’t know what it means, and you don’t know what to tell the patient. So how do you get around this?”

Dr. Klein said that before conducting any genetic testing, clinicians should inform the patient that they may have a genetic variant of uncertain significance. It doesn’t solve the problem, but it does help physicians manage patient expectations. 
 

Clinical Relevance on the Way?

While it may seem that all of the identified variants that predict Parkinson’s disease which, in addition to PSMF1, include the well-established LRRK2 and GBA1, may look the same, this is not true when patient history is taken into account, said Dr. Klein.

For example, age-of-onset of Parkinson’s disease can differ between identified variants, and this has led to “a paradigm change” whereby a purely genetic finding is called a disease. 

This first occurred in Huntington’s disease, when researchers gave individuals at high genetic risk of developing the illness, but who currently had no clinical symptoms, the label of “Stage Zero disease.”

This is important to note “because if we get to the stage of having drugs that can slow down, or even prevent, progression to Parkinson’s disease, then it will be key to have patients we know are going to develop it to participate in clinical trials for such agents,” said Dr. Klein. 

She cited the example of a family that she recently encountered that had genetic test results that showed variants of unknown significance, so Dr. Klein had the family’s samples sent to a specialized lab in Dundee, Scotland, for further analysis.

“The biochemists found that this variant was indeed pathogenic, and kinase-activating, so this is very helpful and very important because there are now clinical trials in Parkinson’s disease with kinase inhibitors,” she noted. 

“If you think there is something else [over and above the finding of uncertain significance] in your Parkinson’s disease panel, and you are not happy with the genetic report, send it somewhere else,” Dr. Klein advised. 

“We will see a lot more patients with genetic Parkinson’s disease in the future,” she predicted, while citing two recent preliminary clinical trials that have shown some promise in terms of neuroprotection in patients with early Parkinson’s disease.

“It remains to be seen whether there will be light at the end of the tunnel,” she said, but it may soon be possible to find treatments that delay, or even prevent, Parkinson’s disease onset. 

Dr. Magrinelli reported receiving speaker’s honoraria from MJFF Edmond J. Safra Clinical Research Fellowship in Movement Disorders (Class of 2023), MJFF Edmond J. Safra Movement Disorders Research Career Development Award 2023 (Grant ID MJFF-023893), American Parkinson Disease Association (Research Grant 2024), and the David Blank Charitable Foundation. Dr. Klein reported being a medical advisor to Retromer Therapeutics, Takeda, and Centogene and speakers’ honoraria from Desitin and Bial.

A version of this article first appeared on Medscape.com.

HELSINKI, FINLAND — A new gene for early-onset Parkinson’s disease has been identified, a discovery that experts believe will have important clinical implications in the not-too-distant future.

A variant in PMSF1, a proteasome regulator, was identified in 15 families from 13 countries around the world, with 22 affected individuals.

“These families were ethnically diverse, and in all of them, the variant in PMSF1 correlated with the neurologic phenotype. We know this is very clear cut — the genotype/phenotype correlation — with the patients carrying the missense mutation having ‘mild’ symptoms, while those with the progressive loss-of-function variant had the most severe phenotype,” she noted. 

“Our findings unequivocally link defective PSMF1 to early-onset PD and neurodegeneration and suggest mitochondrial dysfunction as a mechanistic contributor,” study investigator Francesca Magrinelli, MD, PhD, of University College London (UCL) Queen Square Institute of Neurology, UCL, London, told delegates at the 2024 Congress of the European Academy of Neurology.
 

Managing Patient Expectations

Those “mildly” affected had an early-onset Parkinson’s disease starting between the second and fifth decade of life with pyramidal tract signs, dysphasia, psychiatric comorbidity, and early levodopa-induced dyskinesia. 

In those with the intermediate type, Parkinson’s disease symptoms start in childhood and include, among other things, global hypokinesia, developmental delay, cerebellar signs, and in some, associated epilepsy.

In most cases, there was evidence on brain MRI of a hypoplasia of the corpus callosum, Dr. Magrinelli said. In the most severely affected individuals, there was perinatal lethality with neurologic manifestations.

While it may seem that the genetics of Parkinson’s disease is an academic exercise for the most part, it won’t be too much longer before it yields practical information that will inform how patients are treated, said Parkinson’s disease expert Christine Klein, MD, of the Institute of Neurogenetics and Department of Neurology, University of Lübeck, Helsinki, Finland. 

The genetics of Parkinson’s disease are complicated, even within a single family. So, it’s very important to assess the pathogenicity of different variants, Dr. Klein noted. 

“I am sure that you have all had a Parkinson’s disease [gene] panel back, and it says, ‘variant of uncertain significance.’ This is the worst thing that can happen. The lab does not know what it means. You don’t know what it means, and you don’t know what to tell the patient. So how do you get around this?”

Dr. Klein said that before conducting any genetic testing, clinicians should inform the patient that they may have a genetic variant of uncertain significance. It doesn’t solve the problem, but it does help physicians manage patient expectations. 
 

Clinical Relevance on the Way?

While it may seem that all of the identified variants that predict Parkinson’s disease which, in addition to PSMF1, include the well-established LRRK2 and GBA1, may look the same, this is not true when patient history is taken into account, said Dr. Klein.

For example, age-of-onset of Parkinson’s disease can differ between identified variants, and this has led to “a paradigm change” whereby a purely genetic finding is called a disease. 

This first occurred in Huntington’s disease, when researchers gave individuals at high genetic risk of developing the illness, but who currently had no clinical symptoms, the label of “Stage Zero disease.”

This is important to note “because if we get to the stage of having drugs that can slow down, or even prevent, progression to Parkinson’s disease, then it will be key to have patients we know are going to develop it to participate in clinical trials for such agents,” said Dr. Klein. 

She cited the example of a family that she recently encountered that had genetic test results that showed variants of unknown significance, so Dr. Klein had the family’s samples sent to a specialized lab in Dundee, Scotland, for further analysis.

“The biochemists found that this variant was indeed pathogenic, and kinase-activating, so this is very helpful and very important because there are now clinical trials in Parkinson’s disease with kinase inhibitors,” she noted. 

“If you think there is something else [over and above the finding of uncertain significance] in your Parkinson’s disease panel, and you are not happy with the genetic report, send it somewhere else,” Dr. Klein advised. 

“We will see a lot more patients with genetic Parkinson’s disease in the future,” she predicted, while citing two recent preliminary clinical trials that have shown some promise in terms of neuroprotection in patients with early Parkinson’s disease.

“It remains to be seen whether there will be light at the end of the tunnel,” she said, but it may soon be possible to find treatments that delay, or even prevent, Parkinson’s disease onset. 

Dr. Magrinelli reported receiving speaker’s honoraria from MJFF Edmond J. Safra Clinical Research Fellowship in Movement Disorders (Class of 2023), MJFF Edmond J. Safra Movement Disorders Research Career Development Award 2023 (Grant ID MJFF-023893), American Parkinson Disease Association (Research Grant 2024), and the David Blank Charitable Foundation. Dr. Klein reported being a medical advisor to Retromer Therapeutics, Takeda, and Centogene and speakers’ honoraria from Desitin and Bial.

A version of this article first appeared on Medscape.com.

Researchers have identified a form of B12 deficiency caused by autoantibodies that specifically affects the central nervous system.

Discovered while studying a puzzling case of one patient with inexplicable neurological systems, the same autoantibody was detected in a small percentage of healthy individuals and was nearly four times as prevalent in patients with neuropsychiatric systemic lupus erythematosus (SLE).

“I didn’t think this single investigation was going to yield a broader phenomenon with other patients,” lead author John V. Pluvinage, MD, PhD, a neurology resident at the University of California San Francisco, said in an interview. “It started as an N-of-one study just based on scientific curiosity.”

“It’s a beautifully done study,” added Betty Diamond, MD, director of the Institute of Molecular Medicine at the Feinstein Institutes for Medical Research in Manhasset, New York, commenting on the research. It uncovers “yet another example of a disease where antibodies getting into the brain are the problem.”

The research was published in Science Translational Medicine.
 

The Patient

The investigation began in 2014 with a 67-year-old woman presenting with difficulty speaking, ataxia, and tremor. Her blood tests showed no signs of B12 deficiency, and testing for known autoantibodies came back negative.

Solving this mystery required a more exhaustive approach. The patient enrolled in a research study focused on identifying novel autoantibodies in suspected neuroinflammatory disease, using a screening technology called phage immunoprecipitation sequencing.

“We adapted this technology to screen for autoantibodies in an unbiased manner by displaying every peptide across the human proteome and then mixing those peptides with patient antibodies in order to figure out what the antibodies are binding to,” explained Dr. Pluvinage.

Using this method, he and colleagues discovered that this woman had autoantibodies that target CD320 — a receptor important in the cellular uptake of B12. While her blood tests were normal, B12 in the patient’s cerebral spinal fluid (CSF) was “nearly undetectable,” Dr. Pluvinage said. Using an in vitro model of the blood-brain barrier (BBB), the researchers determined that anti-CD320 impaired the transport of B12 across the BBB by targeting receptors on the cell surface.

Treating the patient with a combination of immunosuppressant medication and high-dose B12 supplementation increased B12 levels in the patient’s CSF and improved clinical symptoms.
 

Identifying More Cases

Dr. Pluvinage and colleagues tested the 254 other individuals enrolled in the neuroinflammatory disease study and identified seven participants with CSF anti-CD320 autoantibodies — four of whom had low B12 in the CSF.

In a group of healthy controls, anti-CD320 seropositivity was 6%, similar to the positivity rate in 132 paired serum and CSF samples from a cohort of patients with multiple sclerosis (5.7%). In this group of patients with multiple sclerosis, anti-CD320 presence in the blood was highly predictive of high levels of CSF methylmalonic acid, a metabolic marker of B12 deficiency.

Researchers also screened for anti-CD320 seropositivity in 408 patients with non-neurologic SLE and 28 patients with neuropsychiatric SLE and found that the autoantibody was nearly four times as prevalent in patients with neurologic symptoms (21.4%) compared with in those with non-neurologic SLE (5.6%).

“The clinical relevance of anti-CD320 in healthy controls remains uncertain,” the authors wrote. However, it is not uncommon to have healthy patients with known autoantibodies.

“There are always people who have autoantibodies who don’t get disease, and why that is we don’t know,” said Dr. Diamond. Some individuals may develop clinical symptoms later, or there may be other reasons why they are protected against disease.

Pluvinage is eager to follow some seropositive healthy individuals to track their neurologic health overtime, to see if the presence of anti-CD320 “alters their neurologic trajectories.”
 

Alternative Pathways

Lastly, Dr. Pluvinage and colleagues set out to explain why patients with anti-CD320 in their blood did not show any signs of B12 deficiency. They hypothesized that another receptor may be compensating and still allowing blood cells to take up B12. Using CRISPR screening, the team identified the low-density lipoprotein receptor as an alternative pathway to B12 uptake.

“These findings suggest a model in which anti-CD320 impairs transport of B12 across the BBB, leading to autoimmune B12 central deficiency (ABCD) with varied neurologic manifestations but sparing peripheral manifestations of B12 deficiency,” the authors wrote.

The work was supported by the National Institute of Mental Health, National Center for Chronic Disease Prevention and Health Promotion, Department of Defense, UCSF Helen Diller Family Comprehensive Cancer Center Laboratory for Cell Analysis Shared Resource Facility, National Multiple Sclerosis Society, Valhalla Foundation, and the Westridge Foundation. Dr. Pluvinage is a co-inventor on a patent application related to this work. Dr. Diamond had no relevant disclosures.

A version of this article first appeared on Medscape.com.

Researchers have identified a form of B12 deficiency caused by autoantibodies that specifically affects the central nervous system.

Discovered while studying a puzzling case of one patient with inexplicable neurological systems, the same autoantibody was detected in a small percentage of healthy individuals and was nearly four times as prevalent in patients with neuropsychiatric systemic lupus erythematosus (SLE).

“I didn’t think this single investigation was going to yield a broader phenomenon with other patients,” lead author John V. Pluvinage, MD, PhD, a neurology resident at the University of California San Francisco, said in an interview. “It started as an N-of-one study just based on scientific curiosity.”

“It’s a beautifully done study,” added Betty Diamond, MD, director of the Institute of Molecular Medicine at the Feinstein Institutes for Medical Research in Manhasset, New York, commenting on the research. It uncovers “yet another example of a disease where antibodies getting into the brain are the problem.”

The research was published in Science Translational Medicine.
 

The Patient

The investigation began in 2014 with a 67-year-old woman presenting with difficulty speaking, ataxia, and tremor. Her blood tests showed no signs of B12 deficiency, and testing for known autoantibodies came back negative.

Solving this mystery required a more exhaustive approach. The patient enrolled in a research study focused on identifying novel autoantibodies in suspected neuroinflammatory disease, using a screening technology called phage immunoprecipitation sequencing.

“We adapted this technology to screen for autoantibodies in an unbiased manner by displaying every peptide across the human proteome and then mixing those peptides with patient antibodies in order to figure out what the antibodies are binding to,” explained Dr. Pluvinage.

Using this method, he and colleagues discovered that this woman had autoantibodies that target CD320 — a receptor important in the cellular uptake of B12. While her blood tests were normal, B12 in the patient’s cerebral spinal fluid (CSF) was “nearly undetectable,” Dr. Pluvinage said. Using an in vitro model of the blood-brain barrier (BBB), the researchers determined that anti-CD320 impaired the transport of B12 across the BBB by targeting receptors on the cell surface.

Treating the patient with a combination of immunosuppressant medication and high-dose B12 supplementation increased B12 levels in the patient’s CSF and improved clinical symptoms.
 

Identifying More Cases

Dr. Pluvinage and colleagues tested the 254 other individuals enrolled in the neuroinflammatory disease study and identified seven participants with CSF anti-CD320 autoantibodies — four of whom had low B12 in the CSF.

In a group of healthy controls, anti-CD320 seropositivity was 6%, similar to the positivity rate in 132 paired serum and CSF samples from a cohort of patients with multiple sclerosis (5.7%). In this group of patients with multiple sclerosis, anti-CD320 presence in the blood was highly predictive of high levels of CSF methylmalonic acid, a metabolic marker of B12 deficiency.

Researchers also screened for anti-CD320 seropositivity in 408 patients with non-neurologic SLE and 28 patients with neuropsychiatric SLE and found that the autoantibody was nearly four times as prevalent in patients with neurologic symptoms (21.4%) compared with in those with non-neurologic SLE (5.6%).

“The clinical relevance of anti-CD320 in healthy controls remains uncertain,” the authors wrote. However, it is not uncommon to have healthy patients with known autoantibodies.

“There are always people who have autoantibodies who don’t get disease, and why that is we don’t know,” said Dr. Diamond. Some individuals may develop clinical symptoms later, or there may be other reasons why they are protected against disease.

Pluvinage is eager to follow some seropositive healthy individuals to track their neurologic health overtime, to see if the presence of anti-CD320 “alters their neurologic trajectories.”
 

Alternative Pathways

Lastly, Dr. Pluvinage and colleagues set out to explain why patients with anti-CD320 in their blood did not show any signs of B12 deficiency. They hypothesized that another receptor may be compensating and still allowing blood cells to take up B12. Using CRISPR screening, the team identified the low-density lipoprotein receptor as an alternative pathway to B12 uptake.

“These findings suggest a model in which anti-CD320 impairs transport of B12 across the BBB, leading to autoimmune B12 central deficiency (ABCD) with varied neurologic manifestations but sparing peripheral manifestations of B12 deficiency,” the authors wrote.

The work was supported by the National Institute of Mental Health, National Center for Chronic Disease Prevention and Health Promotion, Department of Defense, UCSF Helen Diller Family Comprehensive Cancer Center Laboratory for Cell Analysis Shared Resource Facility, National Multiple Sclerosis Society, Valhalla Foundation, and the Westridge Foundation. Dr. Pluvinage is a co-inventor on a patent application related to this work. Dr. Diamond had no relevant disclosures.

A version of this article first appeared on Medscape.com.

Researchers have identified a form of B12 deficiency caused by autoantibodies that specifically affects the central nervous system.

Discovered while studying a puzzling case of one patient with inexplicable neurological systems, the same autoantibody was detected in a small percentage of healthy individuals and was nearly four times as prevalent in patients with neuropsychiatric systemic lupus erythematosus (SLE).

“I didn’t think this single investigation was going to yield a broader phenomenon with other patients,” lead author John V. Pluvinage, MD, PhD, a neurology resident at the University of California San Francisco, said in an interview. “It started as an N-of-one study just based on scientific curiosity.”

“It’s a beautifully done study,” added Betty Diamond, MD, director of the Institute of Molecular Medicine at the Feinstein Institutes for Medical Research in Manhasset, New York, commenting on the research. It uncovers “yet another example of a disease where antibodies getting into the brain are the problem.”

The research was published in Science Translational Medicine.
 

The Patient

The investigation began in 2014 with a 67-year-old woman presenting with difficulty speaking, ataxia, and tremor. Her blood tests showed no signs of B12 deficiency, and testing for known autoantibodies came back negative.

Solving this mystery required a more exhaustive approach. The patient enrolled in a research study focused on identifying novel autoantibodies in suspected neuroinflammatory disease, using a screening technology called phage immunoprecipitation sequencing.

“We adapted this technology to screen for autoantibodies in an unbiased manner by displaying every peptide across the human proteome and then mixing those peptides with patient antibodies in order to figure out what the antibodies are binding to,” explained Dr. Pluvinage.

Using this method, he and colleagues discovered that this woman had autoantibodies that target CD320 — a receptor important in the cellular uptake of B12. While her blood tests were normal, B12 in the patient’s cerebral spinal fluid (CSF) was “nearly undetectable,” Dr. Pluvinage said. Using an in vitro model of the blood-brain barrier (BBB), the researchers determined that anti-CD320 impaired the transport of B12 across the BBB by targeting receptors on the cell surface.

Treating the patient with a combination of immunosuppressant medication and high-dose B12 supplementation increased B12 levels in the patient’s CSF and improved clinical symptoms.
 

Identifying More Cases

Dr. Pluvinage and colleagues tested the 254 other individuals enrolled in the neuroinflammatory disease study and identified seven participants with CSF anti-CD320 autoantibodies — four of whom had low B12 in the CSF.

In a group of healthy controls, anti-CD320 seropositivity was 6%, similar to the positivity rate in 132 paired serum and CSF samples from a cohort of patients with multiple sclerosis (5.7%). In this group of patients with multiple sclerosis, anti-CD320 presence in the blood was highly predictive of high levels of CSF methylmalonic acid, a metabolic marker of B12 deficiency.

Researchers also screened for anti-CD320 seropositivity in 408 patients with non-neurologic SLE and 28 patients with neuropsychiatric SLE and found that the autoantibody was nearly four times as prevalent in patients with neurologic symptoms (21.4%) compared with in those with non-neurologic SLE (5.6%).

“The clinical relevance of anti-CD320 in healthy controls remains uncertain,” the authors wrote. However, it is not uncommon to have healthy patients with known autoantibodies.

“There are always people who have autoantibodies who don’t get disease, and why that is we don’t know,” said Dr. Diamond. Some individuals may develop clinical symptoms later, or there may be other reasons why they are protected against disease.

Pluvinage is eager to follow some seropositive healthy individuals to track their neurologic health overtime, to see if the presence of anti-CD320 “alters their neurologic trajectories.”
 

Alternative Pathways

Lastly, Dr. Pluvinage and colleagues set out to explain why patients with anti-CD320 in their blood did not show any signs of B12 deficiency. They hypothesized that another receptor may be compensating and still allowing blood cells to take up B12. Using CRISPR screening, the team identified the low-density lipoprotein receptor as an alternative pathway to B12 uptake.

“These findings suggest a model in which anti-CD320 impairs transport of B12 across the BBB, leading to autoimmune B12 central deficiency (ABCD) with varied neurologic manifestations but sparing peripheral manifestations of B12 deficiency,” the authors wrote.

The work was supported by the National Institute of Mental Health, National Center for Chronic Disease Prevention and Health Promotion, Department of Defense, UCSF Helen Diller Family Comprehensive Cancer Center Laboratory for Cell Analysis Shared Resource Facility, National Multiple Sclerosis Society, Valhalla Foundation, and the Westridge Foundation. Dr. Pluvinage is a co-inventor on a patent application related to this work. Dr. Diamond had no relevant disclosures.

A version of this article first appeared on Medscape.com.

An updated Cochrane Systematic Review of magnesium sulfate administered before preterm birth for neuroprotection has reaffirmed that the compound significantly reduces the risk of cerebral palsy and has added the finding that it also may reduce the risk of severe neonatal intraventricular hemorrhage.

Still unknown, however, is whether the effects of magnesium sulfate vary according to patient characteristics such as gestational age, or by treatment characteristics such as timing and dose. “We need further research to determine exactly who to treat, and when and how, to ideally standardize clinical practice recommendations across the world,” said Emily S. Shepherd, PhD, lead author of the review.

Magnesium sulfate is widely used for preterm cerebral palsy prevention but variance in national and local recommendations for its use may impede its optimal uptake in some places, she and her co-investigators wrote in the review.

In the United States, the American College of Obstetricians and Gynecologists advises institutions to develop their own guidelines regarding inclusion criteria and treatment regimens “in accordance with one of the larger trials.” (ACOG’s Committee Opinion on Magnesium Sulfate Before Anticipated Preterm Birth for Neuroprotection was originally published in 2010 and was reaffirmed in 2023.)

In a Master Class column on magnesium sulfate for neuroprotection published earlier this year in Ob.Gyn. News, Irina Burd, MD, PhD, wrote that most hospitals in the United States have chosen a higher dose of magnesium sulfate administered up to 31 weeks’ gestation (6-g bolus, followed by 2 g/hour), in keeping with the protocols used in the BEAM trial published by the National Institute of Child Health and Human Development (NICHD). Dr. Burd is the Sylvan Frieman, MD, Endowed Professor and chair of the department of obstetrics, gynecology and reproductive sciences at the University of Maryland School of Medicine, Baltimore, Maryland.

The new Cochrane review included six randomized controlled trials (including the NICHD trial) covering 5917 pregnant participants and 6759 fetuses. Eligibility criteria varied, but all the RCTs included patients in preterm labor or with expected or planned imminent preterm birth at less than 34 weeks’ gestation.

Treatment regimens varied: three trials administered a 4-g loading dose only, and three included a maintenance dose (a 4-6-g loading dose and a 1-2 g/hour maintenance dose). “Although we attempted to explore variation through subgroup analyses, the ability to do this was limited,” the researchers wrote.

Up to 2 years of corrected age, magnesium sulfate reduced the risk of cerebral palsy compared with placebo (relative risk, 0.71; 95% confidence interval (CI), 0.57-0.89) and death or cerebral palsy (RR, 0.87; 95% CI, 0.77-0.98), with a high-certainty grade of evidence. The number needed to treat to prevent one case of cerebral palsy was 60 and the number needed to treat death or cerebral palsy was 56. The impact on severe intracranial hemorrhage (RR, 0.76; 95% CI, 0.60-0.98), a secondary outcome, was backed by moderate-certainty evidence.

Compared with the 2009 Cochrane review, the new study includes two new randomized controlled trials. One of which, the MAGENTA trial, administered magnesium sulfate at 30-34 weeks gestation and included new school-age follow-up data from two previously included trials. While the available data suggest little to no difference in outcomes at school age, more follow-up data are needed to assess this with greater certainty, the reviewers wrote.

While severe adverse outcomes (death, cardiac or respiratory arrest) for pregnant individuals appear not to have increased in pregnant patients who received magnesium sulfate (low-certainty evidence), the compound “probably increased maternal adverse effects severe enough to stop treatment,” the reviewers report (average RR, 3.21; 95% CI, 1.88-5.48; moderate-certainty evidence).

Side effects that were more frequent among women receiving magnesium sulfate include hypotension, tachycardia, warmth over body/flushing, nausea or vomiting, sweating, and dizziness.

“Treatment cessation due to such side effects was in the context of trials being conducted to establish benefit,” noted Dr. Shepherd, of the University of Adelaide in Australia. “With benefit now shown, these side effects may be viewed as comparatively minor/generally tolerable considering the potential benefits for children.”

Proving the neuroprotective value of magnesium sulfate took many years, Dr. Burd explained in the Master Class, as none of the randomized controlled trials analyzed in eventual meta-analyses and systematic reviews had reached their primary endpoints. It wasn’t until researchers obtained unpublished data and conducted these analyses and reviews that a significant effect of magnesium sulfate on cerebral palsy could be seen. Dr. Burd and other researchers are now working to better understand its biologic plausibility and precise mechanisms of action.

Dr. Shepherd disclosed that she is a former editor for Cochrane Pregnancy and Childbirth and current sign-off editor for Cochrane Central Editorial Service but reported having no involvement in the editorial processing of the review. Other authors disclosed that they were investigators for included trials and/or have published opinions in medical journals related to magnesium sulfate to reduce cerebral palsy. Dr. Burd reported no disclosures.

An updated Cochrane Systematic Review of magnesium sulfate administered before preterm birth for neuroprotection has reaffirmed that the compound significantly reduces the risk of cerebral palsy and has added the finding that it also may reduce the risk of severe neonatal intraventricular hemorrhage.

Still unknown, however, is whether the effects of magnesium sulfate vary according to patient characteristics such as gestational age, or by treatment characteristics such as timing and dose. “We need further research to determine exactly who to treat, and when and how, to ideally standardize clinical practice recommendations across the world,” said Emily S. Shepherd, PhD, lead author of the review.

Magnesium sulfate is widely used for preterm cerebral palsy prevention but variance in national and local recommendations for its use may impede its optimal uptake in some places, she and her co-investigators wrote in the review.

In the United States, the American College of Obstetricians and Gynecologists advises institutions to develop their own guidelines regarding inclusion criteria and treatment regimens “in accordance with one of the larger trials.” (ACOG’s Committee Opinion on Magnesium Sulfate Before Anticipated Preterm Birth for Neuroprotection was originally published in 2010 and was reaffirmed in 2023.)

In a Master Class column on magnesium sulfate for neuroprotection published earlier this year in Ob.Gyn. News, Irina Burd, MD, PhD, wrote that most hospitals in the United States have chosen a higher dose of magnesium sulfate administered up to 31 weeks’ gestation (6-g bolus, followed by 2 g/hour), in keeping with the protocols used in the BEAM trial published by the National Institute of Child Health and Human Development (NICHD). Dr. Burd is the Sylvan Frieman, MD, Endowed Professor and chair of the department of obstetrics, gynecology and reproductive sciences at the University of Maryland School of Medicine, Baltimore, Maryland.

The new Cochrane review included six randomized controlled trials (including the NICHD trial) covering 5917 pregnant participants and 6759 fetuses. Eligibility criteria varied, but all the RCTs included patients in preterm labor or with expected or planned imminent preterm birth at less than 34 weeks’ gestation.

Treatment regimens varied: three trials administered a 4-g loading dose only, and three included a maintenance dose (a 4-6-g loading dose and a 1-2 g/hour maintenance dose). “Although we attempted to explore variation through subgroup analyses, the ability to do this was limited,” the researchers wrote.

Up to 2 years of corrected age, magnesium sulfate reduced the risk of cerebral palsy compared with placebo (relative risk, 0.71; 95% confidence interval (CI), 0.57-0.89) and death or cerebral palsy (RR, 0.87; 95% CI, 0.77-0.98), with a high-certainty grade of evidence. The number needed to treat to prevent one case of cerebral palsy was 60 and the number needed to treat death or cerebral palsy was 56. The impact on severe intracranial hemorrhage (RR, 0.76; 95% CI, 0.60-0.98), a secondary outcome, was backed by moderate-certainty evidence.

Compared with the 2009 Cochrane review, the new study includes two new randomized controlled trials. One of which, the MAGENTA trial, administered magnesium sulfate at 30-34 weeks gestation and included new school-age follow-up data from two previously included trials. While the available data suggest little to no difference in outcomes at school age, more follow-up data are needed to assess this with greater certainty, the reviewers wrote.

While severe adverse outcomes (death, cardiac or respiratory arrest) for pregnant individuals appear not to have increased in pregnant patients who received magnesium sulfate (low-certainty evidence), the compound “probably increased maternal adverse effects severe enough to stop treatment,” the reviewers report (average RR, 3.21; 95% CI, 1.88-5.48; moderate-certainty evidence).

Side effects that were more frequent among women receiving magnesium sulfate include hypotension, tachycardia, warmth over body/flushing, nausea or vomiting, sweating, and dizziness.

“Treatment cessation due to such side effects was in the context of trials being conducted to establish benefit,” noted Dr. Shepherd, of the University of Adelaide in Australia. “With benefit now shown, these side effects may be viewed as comparatively minor/generally tolerable considering the potential benefits for children.”

Proving the neuroprotective value of magnesium sulfate took many years, Dr. Burd explained in the Master Class, as none of the randomized controlled trials analyzed in eventual meta-analyses and systematic reviews had reached their primary endpoints. It wasn’t until researchers obtained unpublished data and conducted these analyses and reviews that a significant effect of magnesium sulfate on cerebral palsy could be seen. Dr. Burd and other researchers are now working to better understand its biologic plausibility and precise mechanisms of action.

Dr. Shepherd disclosed that she is a former editor for Cochrane Pregnancy and Childbirth and current sign-off editor for Cochrane Central Editorial Service but reported having no involvement in the editorial processing of the review. Other authors disclosed that they were investigators for included trials and/or have published opinions in medical journals related to magnesium sulfate to reduce cerebral palsy. Dr. Burd reported no disclosures.

An updated Cochrane Systematic Review of magnesium sulfate administered before preterm birth for neuroprotection has reaffirmed that the compound significantly reduces the risk of cerebral palsy and has added the finding that it also may reduce the risk of severe neonatal intraventricular hemorrhage.

Still unknown, however, is whether the effects of magnesium sulfate vary according to patient characteristics such as gestational age, or by treatment characteristics such as timing and dose. “We need further research to determine exactly who to treat, and when and how, to ideally standardize clinical practice recommendations across the world,” said Emily S. Shepherd, PhD, lead author of the review.

Magnesium sulfate is widely used for preterm cerebral palsy prevention but variance in national and local recommendations for its use may impede its optimal uptake in some places, she and her co-investigators wrote in the review.

In the United States, the American College of Obstetricians and Gynecologists advises institutions to develop their own guidelines regarding inclusion criteria and treatment regimens “in accordance with one of the larger trials.” (ACOG’s Committee Opinion on Magnesium Sulfate Before Anticipated Preterm Birth for Neuroprotection was originally published in 2010 and was reaffirmed in 2023.)

In a Master Class column on magnesium sulfate for neuroprotection published earlier this year in Ob.Gyn. News, Irina Burd, MD, PhD, wrote that most hospitals in the United States have chosen a higher dose of magnesium sulfate administered up to 31 weeks’ gestation (6-g bolus, followed by 2 g/hour), in keeping with the protocols used in the BEAM trial published by the National Institute of Child Health and Human Development (NICHD). Dr. Burd is the Sylvan Frieman, MD, Endowed Professor and chair of the department of obstetrics, gynecology and reproductive sciences at the University of Maryland School of Medicine, Baltimore, Maryland.

The new Cochrane review included six randomized controlled trials (including the NICHD trial) covering 5917 pregnant participants and 6759 fetuses. Eligibility criteria varied, but all the RCTs included patients in preterm labor or with expected or planned imminent preterm birth at less than 34 weeks’ gestation.

Treatment regimens varied: three trials administered a 4-g loading dose only, and three included a maintenance dose (a 4-6-g loading dose and a 1-2 g/hour maintenance dose). “Although we attempted to explore variation through subgroup analyses, the ability to do this was limited,” the researchers wrote.

Up to 2 years of corrected age, magnesium sulfate reduced the risk of cerebral palsy compared with placebo (relative risk, 0.71; 95% confidence interval (CI), 0.57-0.89) and death or cerebral palsy (RR, 0.87; 95% CI, 0.77-0.98), with a high-certainty grade of evidence. The number needed to treat to prevent one case of cerebral palsy was 60 and the number needed to treat death or cerebral palsy was 56. The impact on severe intracranial hemorrhage (RR, 0.76; 95% CI, 0.60-0.98), a secondary outcome, was backed by moderate-certainty evidence.

Compared with the 2009 Cochrane review, the new study includes two new randomized controlled trials. One of which, the MAGENTA trial, administered magnesium sulfate at 30-34 weeks gestation and included new school-age follow-up data from two previously included trials. While the available data suggest little to no difference in outcomes at school age, more follow-up data are needed to assess this with greater certainty, the reviewers wrote.

While severe adverse outcomes (death, cardiac or respiratory arrest) for pregnant individuals appear not to have increased in pregnant patients who received magnesium sulfate (low-certainty evidence), the compound “probably increased maternal adverse effects severe enough to stop treatment,” the reviewers report (average RR, 3.21; 95% CI, 1.88-5.48; moderate-certainty evidence).

Side effects that were more frequent among women receiving magnesium sulfate include hypotension, tachycardia, warmth over body/flushing, nausea or vomiting, sweating, and dizziness.

“Treatment cessation due to such side effects was in the context of trials being conducted to establish benefit,” noted Dr. Shepherd, of the University of Adelaide in Australia. “With benefit now shown, these side effects may be viewed as comparatively minor/generally tolerable considering the potential benefits for children.”

Proving the neuroprotective value of magnesium sulfate took many years, Dr. Burd explained in the Master Class, as none of the randomized controlled trials analyzed in eventual meta-analyses and systematic reviews had reached their primary endpoints. It wasn’t until researchers obtained unpublished data and conducted these analyses and reviews that a significant effect of magnesium sulfate on cerebral palsy could be seen. Dr. Burd and other researchers are now working to better understand its biologic plausibility and precise mechanisms of action.

Dr. Shepherd disclosed that she is a former editor for Cochrane Pregnancy and Childbirth and current sign-off editor for Cochrane Central Editorial Service but reported having no involvement in the editorial processing of the review. Other authors disclosed that they were investigators for included trials and/or have published opinions in medical journals related to magnesium sulfate to reduce cerebral palsy. Dr. Burd reported no disclosures.

For decades, scientists have been trying to unravel the mysteries of restless legs syndrome (RLS), a poorly understood and underdiagnosed neurological disorder causing itching, crawling, and aching sensations in the limbs that can only be relieved with movement.

A sweeping new genetic study, coauthored by an international team of 70 — including the world’s leading RLS experts — marks a significant advance in that pursuit. Published in Nature Genetics, it is the largest genetic study of the disease to date.

“It’s a huge step forward for patients as well as the scientific community,” said lead author Juliane Winkelmann, MD, a neurologist and geneticist with the Technical University of Munich, Munich, Germany, who’s been studying and treating patients with RLS for 30 years. “We believe it will allow us to better predict the likelihood of developing RLS and investigate new ways to prevent and modify it.”

The common condition, affecting about 1 in 10 adults, was first described centuries ago — by English physician Thomas Willis in the late 1600s. And while we know a lot more about it today — it’s familial in about half of all patients and has been linked to iron deficiency, among other conditions — its exact cause remains unknown.

With preferred drugs long prescribed to quell symptoms shown in recent years to actually worsen the disorder over time, doctors and patients are hungry for alternatives to treat or prevent the sleep-sabotaging condition.

“The main treatments that everybody continues to use are actually making people worse,” said Andrew Berkowski, MD, a Michigan-based neurologist and RLS specialist not involved in the study. These drugs — dopamine agonists such as levodopa and pramipexole — can also potentially cause drug dependence, Dr. Berkowski said.
 

How This Could Lead to New Treatments

In the new study, the group analyzed three genome-wide association studies, collectively including genetic information from 116,647 patients with RLS and more than 1.5 million people without it.

They identified 161 gene regions believed to contribute to RLS, about a dozen of which are already targets for existing drugs for other conditions. Previously, scientists knew of only 22 associated genes.

“It’s useful in that it identifies new genes we haven’t looked at yet and reinforces the science behind some of the older genes,” said Dr. Berkowski. “It’s given us some ideas for different things we should look into more closely.”

Among the top candidates are genes that influence glutamate — a key chemical messenger that helps move signals between nerve cells in the brain.

Several anticonvulsant and antiseizure drugs, including perampanel, lamotrigine, and gabapentin, target glutamate receptors. And at least one small study has shown perampanel prescribed off-label can improve RLS symptoms.

“Compared to starting at the beginning and developing an entirely new chemical entity, we could run clinical trials using these alternatives in RLS patients,” said the study’s first author, Steven Bell, PhD, an epidemiologist with the University of Cambridge, Cambridge, England.

The study also confirmed the MIES1 gene, which is related to dopamine expression and iron homeostasis, as a key genetic contributor to RLS risk. Low levels of iron in the blood have long been thought to trigger RLS.
 

The Role of Gene-Environment Interactions

Through additional data analysis, the team confirmed that many of the genes associated with RLS play a role in development of the central nervous system.

“This strongly supports the hypothesis that restless legs syndrome is a neurodevelopmental disorder that develops during the embryo stage but doesn’t clinically manifest until later in life,” said Dr. Winkelmann.

About half of people with RLS report some family history of it.

But not all with a genetic predisposition will develop symptoms.

For instance, the study found that while the same gene regions seem to be associated with risk in both men and women, in practice, RLS is twice as common among women. This suggests that something about women’s lives — menstruation, childbirth, metabolism — may switch a preexisting risk into a reality.

“We know that genetic factors play an important role in making people susceptible to the disease,” said Dr. Winkelmann, “but in the end, it is the interaction between genetic and environmental factors that may lead to its manifestation.”

The study also found associations between RLS and depression and suggests that RLS may increase the risk for type 2 diabetes.
 

Improving RLS Care

A potentially useful tool coming out of the study was a “polygenic risk score,” which the researchers developed based on the genes identified. When they tested how accurately the score could predict whether someone would develop RLS within the next 5 years, the model got it right about 90% of the time.

Dr. Winkelmann imagines a day when someone could use such a polygenic risk score to flag the high risk for RLS early enough to take action to try to prevent it. More research is necessary to determine precisely what that action would be.

As for treatments, Dr. Berkowski thinks it’s unlikely that doctors will suddenly begin using existing, glutamate-targeting drugs off-label to treat RLS, as many are prohibitively expensive and wouldn’t be covered by insurance. But he’s optimistic that the study can spawn new research that could ultimately help fill the treatment gap.

Shalini Paruthi, MD, an adjunct professor at Saint Louis University, St. Louis, Missouri, and chair of the Restless Legs Syndrome Foundation’s board of directors, sees another benefit.

“The associations found in this study between RLS and other medical disorders may help patients and their physicians take RLS more seriously,” Dr. Paruthi said, “as treating RLS can lead to multiple other downstream improvements in their health.”

A version of this article appeared on Medscape.com.

For decades, scientists have been trying to unravel the mysteries of restless legs syndrome (RLS), a poorly understood and underdiagnosed neurological disorder causing itching, crawling, and aching sensations in the limbs that can only be relieved with movement.

A sweeping new genetic study, coauthored by an international team of 70 — including the world’s leading RLS experts — marks a significant advance in that pursuit. Published in Nature Genetics, it is the largest genetic study of the disease to date.

“It’s a huge step forward for patients as well as the scientific community,” said lead author Juliane Winkelmann, MD, a neurologist and geneticist with the Technical University of Munich, Munich, Germany, who’s been studying and treating patients with RLS for 30 years. “We believe it will allow us to better predict the likelihood of developing RLS and investigate new ways to prevent and modify it.”

The common condition, affecting about 1 in 10 adults, was first described centuries ago — by English physician Thomas Willis in the late 1600s. And while we know a lot more about it today — it’s familial in about half of all patients and has been linked to iron deficiency, among other conditions — its exact cause remains unknown.

With preferred drugs long prescribed to quell symptoms shown in recent years to actually worsen the disorder over time, doctors and patients are hungry for alternatives to treat or prevent the sleep-sabotaging condition.

“The main treatments that everybody continues to use are actually making people worse,” said Andrew Berkowski, MD, a Michigan-based neurologist and RLS specialist not involved in the study. These drugs — dopamine agonists such as levodopa and pramipexole — can also potentially cause drug dependence, Dr. Berkowski said.
 

How This Could Lead to New Treatments

In the new study, the group analyzed three genome-wide association studies, collectively including genetic information from 116,647 patients with RLS and more than 1.5 million people without it.

They identified 161 gene regions believed to contribute to RLS, about a dozen of which are already targets for existing drugs for other conditions. Previously, scientists knew of only 22 associated genes.

“It’s useful in that it identifies new genes we haven’t looked at yet and reinforces the science behind some of the older genes,” said Dr. Berkowski. “It’s given us some ideas for different things we should look into more closely.”

Among the top candidates are genes that influence glutamate — a key chemical messenger that helps move signals between nerve cells in the brain.

Several anticonvulsant and antiseizure drugs, including perampanel, lamotrigine, and gabapentin, target glutamate receptors. And at least one small study has shown perampanel prescribed off-label can improve RLS symptoms.

“Compared to starting at the beginning and developing an entirely new chemical entity, we could run clinical trials using these alternatives in RLS patients,” said the study’s first author, Steven Bell, PhD, an epidemiologist with the University of Cambridge, Cambridge, England.

The study also confirmed the MIES1 gene, which is related to dopamine expression and iron homeostasis, as a key genetic contributor to RLS risk. Low levels of iron in the blood have long been thought to trigger RLS.
 

The Role of Gene-Environment Interactions

Through additional data analysis, the team confirmed that many of the genes associated with RLS play a role in development of the central nervous system.

“This strongly supports the hypothesis that restless legs syndrome is a neurodevelopmental disorder that develops during the embryo stage but doesn’t clinically manifest until later in life,” said Dr. Winkelmann.

About half of people with RLS report some family history of it.

But not all with a genetic predisposition will develop symptoms.

For instance, the study found that while the same gene regions seem to be associated with risk in both men and women, in practice, RLS is twice as common among women. This suggests that something about women’s lives — menstruation, childbirth, metabolism — may switch a preexisting risk into a reality.

“We know that genetic factors play an important role in making people susceptible to the disease,” said Dr. Winkelmann, “but in the end, it is the interaction between genetic and environmental factors that may lead to its manifestation.”

The study also found associations between RLS and depression and suggests that RLS may increase the risk for type 2 diabetes.
 

Improving RLS Care

A potentially useful tool coming out of the study was a “polygenic risk score,” which the researchers developed based on the genes identified. When they tested how accurately the score could predict whether someone would develop RLS within the next 5 years, the model got it right about 90% of the time.

Dr. Winkelmann imagines a day when someone could use such a polygenic risk score to flag the high risk for RLS early enough to take action to try to prevent it. More research is necessary to determine precisely what that action would be.

As for treatments, Dr. Berkowski thinks it’s unlikely that doctors will suddenly begin using existing, glutamate-targeting drugs off-label to treat RLS, as many are prohibitively expensive and wouldn’t be covered by insurance. But he’s optimistic that the study can spawn new research that could ultimately help fill the treatment gap.

Shalini Paruthi, MD, an adjunct professor at Saint Louis University, St. Louis, Missouri, and chair of the Restless Legs Syndrome Foundation’s board of directors, sees another benefit.

“The associations found in this study between RLS and other medical disorders may help patients and their physicians take RLS more seriously,” Dr. Paruthi said, “as treating RLS can lead to multiple other downstream improvements in their health.”

A version of this article appeared on Medscape.com.

For decades, scientists have been trying to unravel the mysteries of restless legs syndrome (RLS), a poorly understood and underdiagnosed neurological disorder causing itching, crawling, and aching sensations in the limbs that can only be relieved with movement.

A sweeping new genetic study, coauthored by an international team of 70 — including the world’s leading RLS experts — marks a significant advance in that pursuit. Published in Nature Genetics, it is the largest genetic study of the disease to date.

“It’s a huge step forward for patients as well as the scientific community,” said lead author Juliane Winkelmann, MD, a neurologist and geneticist with the Technical University of Munich, Munich, Germany, who’s been studying and treating patients with RLS for 30 years. “We believe it will allow us to better predict the likelihood of developing RLS and investigate new ways to prevent and modify it.”

The common condition, affecting about 1 in 10 adults, was first described centuries ago — by English physician Thomas Willis in the late 1600s. And while we know a lot more about it today — it’s familial in about half of all patients and has been linked to iron deficiency, among other conditions — its exact cause remains unknown.

With preferred drugs long prescribed to quell symptoms shown in recent years to actually worsen the disorder over time, doctors and patients are hungry for alternatives to treat or prevent the sleep-sabotaging condition.

“The main treatments that everybody continues to use are actually making people worse,” said Andrew Berkowski, MD, a Michigan-based neurologist and RLS specialist not involved in the study. These drugs — dopamine agonists such as levodopa and pramipexole — can also potentially cause drug dependence, Dr. Berkowski said.
 

How This Could Lead to New Treatments

In the new study, the group analyzed three genome-wide association studies, collectively including genetic information from 116,647 patients with RLS and more than 1.5 million people without it.

They identified 161 gene regions believed to contribute to RLS, about a dozen of which are already targets for existing drugs for other conditions. Previously, scientists knew of only 22 associated genes.

“It’s useful in that it identifies new genes we haven’t looked at yet and reinforces the science behind some of the older genes,” said Dr. Berkowski. “It’s given us some ideas for different things we should look into more closely.”

Among the top candidates are genes that influence glutamate — a key chemical messenger that helps move signals between nerve cells in the brain.

Several anticonvulsant and antiseizure drugs, including perampanel, lamotrigine, and gabapentin, target glutamate receptors. And at least one small study has shown perampanel prescribed off-label can improve RLS symptoms.

“Compared to starting at the beginning and developing an entirely new chemical entity, we could run clinical trials using these alternatives in RLS patients,” said the study’s first author, Steven Bell, PhD, an epidemiologist with the University of Cambridge, Cambridge, England.

The study also confirmed the MIES1 gene, which is related to dopamine expression and iron homeostasis, as a key genetic contributor to RLS risk. Low levels of iron in the blood have long been thought to trigger RLS.
 

The Role of Gene-Environment Interactions

Through additional data analysis, the team confirmed that many of the genes associated with RLS play a role in development of the central nervous system.

“This strongly supports the hypothesis that restless legs syndrome is a neurodevelopmental disorder that develops during the embryo stage but doesn’t clinically manifest until later in life,” said Dr. Winkelmann.

About half of people with RLS report some family history of it.

But not all with a genetic predisposition will develop symptoms.

For instance, the study found that while the same gene regions seem to be associated with risk in both men and women, in practice, RLS is twice as common among women. This suggests that something about women’s lives — menstruation, childbirth, metabolism — may switch a preexisting risk into a reality.

“We know that genetic factors play an important role in making people susceptible to the disease,” said Dr. Winkelmann, “but in the end, it is the interaction between genetic and environmental factors that may lead to its manifestation.”

The study also found associations between RLS and depression and suggests that RLS may increase the risk for type 2 diabetes.
 

Improving RLS Care

A potentially useful tool coming out of the study was a “polygenic risk score,” which the researchers developed based on the genes identified. When they tested how accurately the score could predict whether someone would develop RLS within the next 5 years, the model got it right about 90% of the time.

Dr. Winkelmann imagines a day when someone could use such a polygenic risk score to flag the high risk for RLS early enough to take action to try to prevent it. More research is necessary to determine precisely what that action would be.

As for treatments, Dr. Berkowski thinks it’s unlikely that doctors will suddenly begin using existing, glutamate-targeting drugs off-label to treat RLS, as many are prohibitively expensive and wouldn’t be covered by insurance. But he’s optimistic that the study can spawn new research that could ultimately help fill the treatment gap.

Shalini Paruthi, MD, an adjunct professor at Saint Louis University, St. Louis, Missouri, and chair of the Restless Legs Syndrome Foundation’s board of directors, sees another benefit.

“The associations found in this study between RLS and other medical disorders may help patients and their physicians take RLS more seriously,” Dr. Paruthi said, “as treating RLS can lead to multiple other downstream improvements in their health.”

A version of this article appeared on Medscape.com.

Meningitis has been highlighted as a novel risk factor for trigeminal neuralgia in a nationwide, propensity-matched study of hospital admissions.

In multivariate analysis, the odds of meningitis were threefold higher in patients admitted with trigeminal neuralgia than in matched controls without trigeminal neuralgia.

This is the first nationwide population-based study of the rare, chronic pain disorder to identify the prevalence of trigeminal neuralgia admissions in the United States and risk factors contributing to trigeminal neuralgia development.

“Our results affirm known associations between trigeminal neuralgia and comorbidities like multiple sclerosis, and they also identify meningitis as a novel risk factor for trigeminal neuralgia,” said investigator Megan Tang, BS, a medical student at the Icahn School of Medicine at Mount Sinai, New York City.

The findings were presented at the American Association of Neurological Surgeons (AANS) 2024 annual meeting.
 

Strong Clinical Risk Factors

Trigeminal neuralgia is a rare pain disorder involving neurovascular compression of the trigeminal nerve. Its etiology and risk factors are poorly understood. Current literature is based on limited datasets and reports inconsistent risk factors across studies.

To better understand the disorder, researchers used International Classification of Diseases (ICD)-9 codes to identify trigeminal neuralgia admissions in the National Inpatient Sample from 2016 to 2019, and then propensity matched them 1:1 to non-trigeminal neuralgia admissions based on demographics, socioeconomic status, and Charlson comorbidity index scores.

Univariate analysis identified 136,345 trigeminal neuralgia admissions or an overall prevalence of 0.096%.

Trigeminal neuralgia admissions had lower morbidity than non-trigeminal neuralgia admissions and a higher prevalence of non-White patients, private insurance, and prolonged length of stay, Ms. Tang said.

Patients admitted for trigeminal neuralgia also had a higher prevalence of several chronic conditions, including hypertension, hyperlipidemia, and osteoarthritis; inflammatory conditions like lupus, meningitis, rheumatoid arthritis, and inflammatory bowel disease; and neurologic conditions including multiple sclerosis, epilepsy, stroke, and neurovascular compression disorders.

In multivariate analysis, investigators identified meningitis as a previously unknown risk factor for trigeminal neuralgia (odds ratio [OR], 3.1; P < .001).

Other strong risk factors were neurovascular compression disorders (OR, 39.82; P < .001) and multiple sclerosis (OR, 12.41; P < .001). Non-White race (Black; OR, 1.09; Hispanic; OR, 1.23; Other; OR, 1.24) and use of Medicaid (OR, 1.07) and other insurance (OR, 1.17) were demographic risk factors for trigeminal neuralgia.

“This finding points us toward future work exploring the potential mechanisms of predictors, most notably inflammatory conditions in trigeminal neuralgia development,” Ms. Tang concluded.

She declined to comment further on the findings, noting the investigators are still finalizing the results and interpretation.
 

Ask About Meningitis, Fever

Commenting on the findings, Michael D. Staudt, MD, MSc, University Hospitals Cleveland Medical Center, said that many patients who present with classical trigeminal neuralgia will have a blood vessel on MRI that is pressing on the trigeminal nerve.

“Obviously, the nerve is bathed in cerebrospinal fluid. So, if there’s an inflammatory marker, inflammation, or infection that could be injuring the nerve in a way that we don’t yet understand, that could be something that could cause trigeminal neuralgia without having to see a blood vessel,” said Dr. Staudt, who was not involved in the study. “It makes sense, theoretically. Something that’s inflammatory, something that’s irritating, that’s novel.”

Currently, predictive markers include clinical history, response to classical medications such as carbamazepine, and MRI findings, Dr. Staudt noted.

“Someone shows up with symptoms and MRI, and it’s basically do they have a blood vessel or not,” he said. “Treatments are generally within the same categories, but we don’t think it’s the same sort of success rate as seeing a blood vessel.”

Further research is needed, but, in the meantime, Dr. Staudt said, “We can ask patients who show up with facial pain if they’ve ever had meningitis or some sort of fever that preceded their onset of pain.”

The study had no specific funding. Ms. Tang and coauthor Jack Y. Zhang, MS, reported no relevant financial disclosures. Dr. Staudt reported serving as a consultant for Abbott and as a scientific adviser and consultant for Boston Scientific.

A version of this article appeared on Medscape.com.

Meningitis has been highlighted as a novel risk factor for trigeminal neuralgia in a nationwide, propensity-matched study of hospital admissions.

In multivariate analysis, the odds of meningitis were threefold higher in patients admitted with trigeminal neuralgia than in matched controls without trigeminal neuralgia.

This is the first nationwide population-based study of the rare, chronic pain disorder to identify the prevalence of trigeminal neuralgia admissions in the United States and risk factors contributing to trigeminal neuralgia development.

“Our results affirm known associations between trigeminal neuralgia and comorbidities like multiple sclerosis, and they also identify meningitis as a novel risk factor for trigeminal neuralgia,” said investigator Megan Tang, BS, a medical student at the Icahn School of Medicine at Mount Sinai, New York City.

The findings were presented at the American Association of Neurological Surgeons (AANS) 2024 annual meeting.
 

Strong Clinical Risk Factors

Trigeminal neuralgia is a rare pain disorder involving neurovascular compression of the trigeminal nerve. Its etiology and risk factors are poorly understood. Current literature is based on limited datasets and reports inconsistent risk factors across studies.

To better understand the disorder, researchers used International Classification of Diseases (ICD)-9 codes to identify trigeminal neuralgia admissions in the National Inpatient Sample from 2016 to 2019, and then propensity matched them 1:1 to non-trigeminal neuralgia admissions based on demographics, socioeconomic status, and Charlson comorbidity index scores.

Univariate analysis identified 136,345 trigeminal neuralgia admissions or an overall prevalence of 0.096%.

Trigeminal neuralgia admissions had lower morbidity than non-trigeminal neuralgia admissions and a higher prevalence of non-White patients, private insurance, and prolonged length of stay, Ms. Tang said.

Patients admitted for trigeminal neuralgia also had a higher prevalence of several chronic conditions, including hypertension, hyperlipidemia, and osteoarthritis; inflammatory conditions like lupus, meningitis, rheumatoid arthritis, and inflammatory bowel disease; and neurologic conditions including multiple sclerosis, epilepsy, stroke, and neurovascular compression disorders.

In multivariate analysis, investigators identified meningitis as a previously unknown risk factor for trigeminal neuralgia (odds ratio [OR], 3.1; P < .001).

Other strong risk factors were neurovascular compression disorders (OR, 39.82; P < .001) and multiple sclerosis (OR, 12.41; P < .001). Non-White race (Black; OR, 1.09; Hispanic; OR, 1.23; Other; OR, 1.24) and use of Medicaid (OR, 1.07) and other insurance (OR, 1.17) were demographic risk factors for trigeminal neuralgia.

“This finding points us toward future work exploring the potential mechanisms of predictors, most notably inflammatory conditions in trigeminal neuralgia development,” Ms. Tang concluded.

She declined to comment further on the findings, noting the investigators are still finalizing the results and interpretation.
 

Ask About Meningitis, Fever

Commenting on the findings, Michael D. Staudt, MD, MSc, University Hospitals Cleveland Medical Center, said that many patients who present with classical trigeminal neuralgia will have a blood vessel on MRI that is pressing on the trigeminal nerve.

“Obviously, the nerve is bathed in cerebrospinal fluid. So, if there’s an inflammatory marker, inflammation, or infection that could be injuring the nerve in a way that we don’t yet understand, that could be something that could cause trigeminal neuralgia without having to see a blood vessel,” said Dr. Staudt, who was not involved in the study. “It makes sense, theoretically. Something that’s inflammatory, something that’s irritating, that’s novel.”

Currently, predictive markers include clinical history, response to classical medications such as carbamazepine, and MRI findings, Dr. Staudt noted.

“Someone shows up with symptoms and MRI, and it’s basically do they have a blood vessel or not,” he said. “Treatments are generally within the same categories, but we don’t think it’s the same sort of success rate as seeing a blood vessel.”

Further research is needed, but, in the meantime, Dr. Staudt said, “We can ask patients who show up with facial pain if they’ve ever had meningitis or some sort of fever that preceded their onset of pain.”

The study had no specific funding. Ms. Tang and coauthor Jack Y. Zhang, MS, reported no relevant financial disclosures. Dr. Staudt reported serving as a consultant for Abbott and as a scientific adviser and consultant for Boston Scientific.

A version of this article appeared on Medscape.com.

Meningitis has been highlighted as a novel risk factor for trigeminal neuralgia in a nationwide, propensity-matched study of hospital admissions.

In multivariate analysis, the odds of meningitis were threefold higher in patients admitted with trigeminal neuralgia than in matched controls without trigeminal neuralgia.

This is the first nationwide population-based study of the rare, chronic pain disorder to identify the prevalence of trigeminal neuralgia admissions in the United States and risk factors contributing to trigeminal neuralgia development.

“Our results affirm known associations between trigeminal neuralgia and comorbidities like multiple sclerosis, and they also identify meningitis as a novel risk factor for trigeminal neuralgia,” said investigator Megan Tang, BS, a medical student at the Icahn School of Medicine at Mount Sinai, New York City.

The findings were presented at the American Association of Neurological Surgeons (AANS) 2024 annual meeting.
 

Strong Clinical Risk Factors

Trigeminal neuralgia is a rare pain disorder involving neurovascular compression of the trigeminal nerve. Its etiology and risk factors are poorly understood. Current literature is based on limited datasets and reports inconsistent risk factors across studies.

To better understand the disorder, researchers used International Classification of Diseases (ICD)-9 codes to identify trigeminal neuralgia admissions in the National Inpatient Sample from 2016 to 2019, and then propensity matched them 1:1 to non-trigeminal neuralgia admissions based on demographics, socioeconomic status, and Charlson comorbidity index scores.

Univariate analysis identified 136,345 trigeminal neuralgia admissions or an overall prevalence of 0.096%.

Trigeminal neuralgia admissions had lower morbidity than non-trigeminal neuralgia admissions and a higher prevalence of non-White patients, private insurance, and prolonged length of stay, Ms. Tang said.

Patients admitted for trigeminal neuralgia also had a higher prevalence of several chronic conditions, including hypertension, hyperlipidemia, and osteoarthritis; inflammatory conditions like lupus, meningitis, rheumatoid arthritis, and inflammatory bowel disease; and neurologic conditions including multiple sclerosis, epilepsy, stroke, and neurovascular compression disorders.

In multivariate analysis, investigators identified meningitis as a previously unknown risk factor for trigeminal neuralgia (odds ratio [OR], 3.1; P < .001).

Other strong risk factors were neurovascular compression disorders (OR, 39.82; P < .001) and multiple sclerosis (OR, 12.41; P < .001). Non-White race (Black; OR, 1.09; Hispanic; OR, 1.23; Other; OR, 1.24) and use of Medicaid (OR, 1.07) and other insurance (OR, 1.17) were demographic risk factors for trigeminal neuralgia.

“This finding points us toward future work exploring the potential mechanisms of predictors, most notably inflammatory conditions in trigeminal neuralgia development,” Ms. Tang concluded.

She declined to comment further on the findings, noting the investigators are still finalizing the results and interpretation.
 

Ask About Meningitis, Fever

Commenting on the findings, Michael D. Staudt, MD, MSc, University Hospitals Cleveland Medical Center, said that many patients who present with classical trigeminal neuralgia will have a blood vessel on MRI that is pressing on the trigeminal nerve.

“Obviously, the nerve is bathed in cerebrospinal fluid. So, if there’s an inflammatory marker, inflammation, or infection that could be injuring the nerve in a way that we don’t yet understand, that could be something that could cause trigeminal neuralgia without having to see a blood vessel,” said Dr. Staudt, who was not involved in the study. “It makes sense, theoretically. Something that’s inflammatory, something that’s irritating, that’s novel.”

Currently, predictive markers include clinical history, response to classical medications such as carbamazepine, and MRI findings, Dr. Staudt noted.

“Someone shows up with symptoms and MRI, and it’s basically do they have a blood vessel or not,” he said. “Treatments are generally within the same categories, but we don’t think it’s the same sort of success rate as seeing a blood vessel.”

Further research is needed, but, in the meantime, Dr. Staudt said, “We can ask patients who show up with facial pain if they’ve ever had meningitis or some sort of fever that preceded their onset of pain.”

The study had no specific funding. Ms. Tang and coauthor Jack Y. Zhang, MS, reported no relevant financial disclosures. Dr. Staudt reported serving as a consultant for Abbott and as a scientific adviser and consultant for Boston Scientific.

A version of this article appeared on Medscape.com.

New guidelines to manage peripheral neuropathy related to Sjögren disease have been developed by a multidisciplinary team of physicians from across medicine.

The guidelines will provide an evidence-based resource for the assessment, diagnosis, and treatment of various peripheral neuropathies related to the disorder.

Up until now, the field has been “haphazard and chaotic,” lead author George Sarka, MD, DrPH, MPH, director of the CME Committee for MemorialCare, Saddleback Medical Center, Laguna Hills, California, and member of the Sjögren Foundation PNS Guidelines Topic Review Group (TRG), told this news organization.

Dr. Sarka discussed the initiative at the American Academy of Neurology 2024 annual meeting.


 

Severe, Complex Illness

Sjögren disease is the second most common autoimmune rheumatic disorder after rheumatoid arthritis, affecting an estimated 4 million Americans. Women make up most of the patient population at a ratio of 9:1.

The condition typically affects the mucous membranes and moisture-secreting glands of the eyes and mouth, resulting in decreased tears and saliva. But peripheral nervous system (PNS) manifestations often precede these symptoms and can occur in up to 60% of Sjögren disease cases.

“Traditionally, Sjögren’s was looked at as a dry eye and dry mouth disease, but we realize now that it’s so much broader than that,” said Dr. Sarka. “It’s a severe, systemic, and complex illness that can affect any body organ or system, and the nervous system is frequently affected.”

PNS manifestations cause more than mere discomfort; they can lead to diagnostic and management challenges, costly treatments, and diminished quality of life.

Getting a proper diagnosis goes a long way toward improving the quality of life for these patients, Steven Mandel, MD, clinical professor of neurology at the Zucker School of Medicine at Hofstra-Northwell, adjunct clinical professor of medicine at NY Medical College, New York City, and member of the TRG, told this news organization.

The problem is, doctors don’t always think an autoimmune disorder is causing the symptoms, said Dr. Sarka. “There’s an old adage in neurology that if you don’t think about it, you’re going to miss it; you have to ask, and that’s what we’re trying to get people to do.”

The condition often accompanies other immune system disorders such as rheumatoid arthritis and lupus. But as patients are referred back and forth between ophthalmologists, rheumatologists, and neurologists, the condition is often missed. “It could be 4 or 5 years before a definitive diagnosis of Sjögren’s is made,” said Dr. Sarka.

He believes the education system is partly to blame. “Medical schools have been very deficient in teaching people about recognizing Sjögren disease.”

That leaves many physicians at a loss about “what to do with these patients when they walk in the door,” said Dr. Mandel. “They don’t know how to manage them; they don’t know how to diagnose them; and they don’t know how to treat them.”

Developing guidelines with multispecialty collaboration was “absolutely critical” in addressing this knowledge gap, Dr. Mandel added. That process involved “a very rigorous and transparent methodology so that it would be accepted by all the professionals involved in Sjögren’s,” he said.

The process took 3 years and involved amassing and grading the evidence, getting consensus from committee members, developing recommendations, and getting feedback and external review.
 

Scant Evidence

An early literature search revealed very little evidence on PNS manifestations in patients with Sjögren disease, so the guideline committee “leaned very heavily on expert opinion” to develop recommendations, Kathy Hammitt, MA, vice president of Medical and Scientific Affairs, Sjögren’s Foundation, told this news organization.

The literature search also showed different terms are used to describe PNS, “which is where the chaos comes in,” said Dr. Sarka.

Experts from different specialties worked together to define and align nomenclature used by various specialists. They developed definitions for seven PNS categories including mononeuropathy, large fiber neuropathy, small fiber neuropathy, demyelinating polyradiculoneuropathy, ganglionopathy, vasculitis neuropathy, and autoimmune nervous system neuropathy.

The guidelines pertaining to PNS manifestations encompass a spectrum of neurologic abnormalities, including cranial neuropathies (trigeminal neuropathy or acute facial neuropathy), polyneuropathies (large fiber neuropathy, small fiber neuropathy, demyelinating polyradiculoneuropathy, vasculitis neuropathy, or ganglionopathy), and autonomic nervous system (ANS) neuropathies (postural tachycardia, orthostatic hypotension, or autonomic dysfunction).
 

Key Steps

The guidelines address two key steps for each PNS manifestation — the workup and evaluation of patients with suspected ANS manifestation including standard evaluations, diagnostic tests, and treatment. The experts developed 31 best practices for diagnosis and workup and 20 treatment recommendations.

Initial assessment of potential ANS involvement includes asking patients about orthostatic postural lightheadedness and difficulties with digestion, urination, sweating, and sexual function.

Treatment of autoimmune diseases typically focuses on relieving symptoms and can include steroids, the anticonvulsant gabapentin, the monoclonal antibody rituximab, and intravenous immunoglobulin. “The type of neuropathy will mandate or suggest certain therapies over others,” said Dr. Sarka, adding that a patient can have more than one neuropathy.

Therapeutics for Sjögren disease is another example of an area that has been “very haphazard,” he added.

The guidelines are aimed not just at specialists but also at general practitioners who treat many of these patients. But Dr. Hammitt emphasized that neurologists can be “instrumental” in identifying Sjögren disease in patients with PNS symptoms.

“Our hope is that specialists — in this case, neurologists — will recognize the potential for this condition in their PNS patients and ensure referral to a rheumatologist or knowledgeable family practitioner to manage overall care.”

The committee will soon submit its manuscript to the AAN for publication.

“Once published, we will have a robust dissemination strategy to ensure that providers, patients, and policymakers are aware of, and use, this very valuable resource,” said Dr. Hammitt.

No conflicts of interest were reported.

A version of this article appeared on Medscape.com.

New guidelines to manage peripheral neuropathy related to Sjögren disease have been developed by a multidisciplinary team of physicians from across medicine.

The guidelines will provide an evidence-based resource for the assessment, diagnosis, and treatment of various peripheral neuropathies related to the disorder.

Up until now, the field has been “haphazard and chaotic,” lead author George Sarka, MD, DrPH, MPH, director of the CME Committee for MemorialCare, Saddleback Medical Center, Laguna Hills, California, and member of the Sjögren Foundation PNS Guidelines Topic Review Group (TRG), told this news organization.

Dr. Sarka discussed the initiative at the American Academy of Neurology 2024 annual meeting.


 

Severe, Complex Illness

Sjögren disease is the second most common autoimmune rheumatic disorder after rheumatoid arthritis, affecting an estimated 4 million Americans. Women make up most of the patient population at a ratio of 9:1.

The condition typically affects the mucous membranes and moisture-secreting glands of the eyes and mouth, resulting in decreased tears and saliva. But peripheral nervous system (PNS) manifestations often precede these symptoms and can occur in up to 60% of Sjögren disease cases.

“Traditionally, Sjögren’s was looked at as a dry eye and dry mouth disease, but we realize now that it’s so much broader than that,” said Dr. Sarka. “It’s a severe, systemic, and complex illness that can affect any body organ or system, and the nervous system is frequently affected.”

PNS manifestations cause more than mere discomfort; they can lead to diagnostic and management challenges, costly treatments, and diminished quality of life.

Getting a proper diagnosis goes a long way toward improving the quality of life for these patients, Steven Mandel, MD, clinical professor of neurology at the Zucker School of Medicine at Hofstra-Northwell, adjunct clinical professor of medicine at NY Medical College, New York City, and member of the TRG, told this news organization.

The problem is, doctors don’t always think an autoimmune disorder is causing the symptoms, said Dr. Sarka. “There’s an old adage in neurology that if you don’t think about it, you’re going to miss it; you have to ask, and that’s what we’re trying to get people to do.”

The condition often accompanies other immune system disorders such as rheumatoid arthritis and lupus. But as patients are referred back and forth between ophthalmologists, rheumatologists, and neurologists, the condition is often missed. “It could be 4 or 5 years before a definitive diagnosis of Sjögren’s is made,” said Dr. Sarka.

He believes the education system is partly to blame. “Medical schools have been very deficient in teaching people about recognizing Sjögren disease.”

That leaves many physicians at a loss about “what to do with these patients when they walk in the door,” said Dr. Mandel. “They don’t know how to manage them; they don’t know how to diagnose them; and they don’t know how to treat them.”

Developing guidelines with multispecialty collaboration was “absolutely critical” in addressing this knowledge gap, Dr. Mandel added. That process involved “a very rigorous and transparent methodology so that it would be accepted by all the professionals involved in Sjögren’s,” he said.

The process took 3 years and involved amassing and grading the evidence, getting consensus from committee members, developing recommendations, and getting feedback and external review.
 

Scant Evidence

An early literature search revealed very little evidence on PNS manifestations in patients with Sjögren disease, so the guideline committee “leaned very heavily on expert opinion” to develop recommendations, Kathy Hammitt, MA, vice president of Medical and Scientific Affairs, Sjögren’s Foundation, told this news organization.

The literature search also showed different terms are used to describe PNS, “which is where the chaos comes in,” said Dr. Sarka.

Experts from different specialties worked together to define and align nomenclature used by various specialists. They developed definitions for seven PNS categories including mononeuropathy, large fiber neuropathy, small fiber neuropathy, demyelinating polyradiculoneuropathy, ganglionopathy, vasculitis neuropathy, and autoimmune nervous system neuropathy.

The guidelines pertaining to PNS manifestations encompass a spectrum of neurologic abnormalities, including cranial neuropathies (trigeminal neuropathy or acute facial neuropathy), polyneuropathies (large fiber neuropathy, small fiber neuropathy, demyelinating polyradiculoneuropathy, vasculitis neuropathy, or ganglionopathy), and autonomic nervous system (ANS) neuropathies (postural tachycardia, orthostatic hypotension, or autonomic dysfunction).
 

Key Steps

The guidelines address two key steps for each PNS manifestation — the workup and evaluation of patients with suspected ANS manifestation including standard evaluations, diagnostic tests, and treatment. The experts developed 31 best practices for diagnosis and workup and 20 treatment recommendations.

Initial assessment of potential ANS involvement includes asking patients about orthostatic postural lightheadedness and difficulties with digestion, urination, sweating, and sexual function.

Treatment of autoimmune diseases typically focuses on relieving symptoms and can include steroids, the anticonvulsant gabapentin, the monoclonal antibody rituximab, and intravenous immunoglobulin. “The type of neuropathy will mandate or suggest certain therapies over others,” said Dr. Sarka, adding that a patient can have more than one neuropathy.

Therapeutics for Sjögren disease is another example of an area that has been “very haphazard,” he added.

The guidelines are aimed not just at specialists but also at general practitioners who treat many of these patients. But Dr. Hammitt emphasized that neurologists can be “instrumental” in identifying Sjögren disease in patients with PNS symptoms.

“Our hope is that specialists — in this case, neurologists — will recognize the potential for this condition in their PNS patients and ensure referral to a rheumatologist or knowledgeable family practitioner to manage overall care.”

The committee will soon submit its manuscript to the AAN for publication.

“Once published, we will have a robust dissemination strategy to ensure that providers, patients, and policymakers are aware of, and use, this very valuable resource,” said Dr. Hammitt.

No conflicts of interest were reported.

A version of this article appeared on Medscape.com.

New guidelines to manage peripheral neuropathy related to Sjögren disease have been developed by a multidisciplinary team of physicians from across medicine.

The guidelines will provide an evidence-based resource for the assessment, diagnosis, and treatment of various peripheral neuropathies related to the disorder.

Up until now, the field has been “haphazard and chaotic,” lead author George Sarka, MD, DrPH, MPH, director of the CME Committee for MemorialCare, Saddleback Medical Center, Laguna Hills, California, and member of the Sjögren Foundation PNS Guidelines Topic Review Group (TRG), told this news organization.

Dr. Sarka discussed the initiative at the American Academy of Neurology 2024 annual meeting.


 

Severe, Complex Illness

Sjögren disease is the second most common autoimmune rheumatic disorder after rheumatoid arthritis, affecting an estimated 4 million Americans. Women make up most of the patient population at a ratio of 9:1.

The condition typically affects the mucous membranes and moisture-secreting glands of the eyes and mouth, resulting in decreased tears and saliva. But peripheral nervous system (PNS) manifestations often precede these symptoms and can occur in up to 60% of Sjögren disease cases.

“Traditionally, Sjögren’s was looked at as a dry eye and dry mouth disease, but we realize now that it’s so much broader than that,” said Dr. Sarka. “It’s a severe, systemic, and complex illness that can affect any body organ or system, and the nervous system is frequently affected.”

PNS manifestations cause more than mere discomfort; they can lead to diagnostic and management challenges, costly treatments, and diminished quality of life.

Getting a proper diagnosis goes a long way toward improving the quality of life for these patients, Steven Mandel, MD, clinical professor of neurology at the Zucker School of Medicine at Hofstra-Northwell, adjunct clinical professor of medicine at NY Medical College, New York City, and member of the TRG, told this news organization.

The problem is, doctors don’t always think an autoimmune disorder is causing the symptoms, said Dr. Sarka. “There’s an old adage in neurology that if you don’t think about it, you’re going to miss it; you have to ask, and that’s what we’re trying to get people to do.”

The condition often accompanies other immune system disorders such as rheumatoid arthritis and lupus. But as patients are referred back and forth between ophthalmologists, rheumatologists, and neurologists, the condition is often missed. “It could be 4 or 5 years before a definitive diagnosis of Sjögren’s is made,” said Dr. Sarka.

He believes the education system is partly to blame. “Medical schools have been very deficient in teaching people about recognizing Sjögren disease.”

That leaves many physicians at a loss about “what to do with these patients when they walk in the door,” said Dr. Mandel. “They don’t know how to manage them; they don’t know how to diagnose them; and they don’t know how to treat them.”

Developing guidelines with multispecialty collaboration was “absolutely critical” in addressing this knowledge gap, Dr. Mandel added. That process involved “a very rigorous and transparent methodology so that it would be accepted by all the professionals involved in Sjögren’s,” he said.

The process took 3 years and involved amassing and grading the evidence, getting consensus from committee members, developing recommendations, and getting feedback and external review.
 

Scant Evidence

An early literature search revealed very little evidence on PNS manifestations in patients with Sjögren disease, so the guideline committee “leaned very heavily on expert opinion” to develop recommendations, Kathy Hammitt, MA, vice president of Medical and Scientific Affairs, Sjögren’s Foundation, told this news organization.

The literature search also showed different terms are used to describe PNS, “which is where the chaos comes in,” said Dr. Sarka.

Experts from different specialties worked together to define and align nomenclature used by various specialists. They developed definitions for seven PNS categories including mononeuropathy, large fiber neuropathy, small fiber neuropathy, demyelinating polyradiculoneuropathy, ganglionopathy, vasculitis neuropathy, and autoimmune nervous system neuropathy.

The guidelines pertaining to PNS manifestations encompass a spectrum of neurologic abnormalities, including cranial neuropathies (trigeminal neuropathy or acute facial neuropathy), polyneuropathies (large fiber neuropathy, small fiber neuropathy, demyelinating polyradiculoneuropathy, vasculitis neuropathy, or ganglionopathy), and autonomic nervous system (ANS) neuropathies (postural tachycardia, orthostatic hypotension, or autonomic dysfunction).
 

Key Steps

The guidelines address two key steps for each PNS manifestation — the workup and evaluation of patients with suspected ANS manifestation including standard evaluations, diagnostic tests, and treatment. The experts developed 31 best practices for diagnosis and workup and 20 treatment recommendations.

Initial assessment of potential ANS involvement includes asking patients about orthostatic postural lightheadedness and difficulties with digestion, urination, sweating, and sexual function.

Treatment of autoimmune diseases typically focuses on relieving symptoms and can include steroids, the anticonvulsant gabapentin, the monoclonal antibody rituximab, and intravenous immunoglobulin. “The type of neuropathy will mandate or suggest certain therapies over others,” said Dr. Sarka, adding that a patient can have more than one neuropathy.

Therapeutics for Sjögren disease is another example of an area that has been “very haphazard,” he added.

The guidelines are aimed not just at specialists but also at general practitioners who treat many of these patients. But Dr. Hammitt emphasized that neurologists can be “instrumental” in identifying Sjögren disease in patients with PNS symptoms.

“Our hope is that specialists — in this case, neurologists — will recognize the potential for this condition in their PNS patients and ensure referral to a rheumatologist or knowledgeable family practitioner to manage overall care.”

The committee will soon submit its manuscript to the AAN for publication.

“Once published, we will have a robust dissemination strategy to ensure that providers, patients, and policymakers are aware of, and use, this very valuable resource,” said Dr. Hammitt.

No conflicts of interest were reported.

A version of this article appeared on Medscape.com.

Amyloidosis is a condition marked by the accumulation of insoluble beta-sheet fibrillar protein aggregates in tissues that can be acquired or hereditary. Hereditary amyloidogenic transthyretin (hATTR) amyloidosis is an autosomal-dominant disease caused by pathogenic variants in the TTR gene. The TTR protein is essential for transporting thyroxine and retinol-binding protein and is primarily synthesized in the liver, becoming unstable as a result of the pathogenic mutations. Inherited pathogenic variants lead to the protein’s misfolding, aggregation, and deposition as amyloid fibrils in different organs, resulting in progressive multisystem dysfunction. hATTR amyloidosis is a heterogenous disease, characterized by a wide range of clinical manifestations affecting the peripheral (both somatic and autonomic) nervous system, heart, kidneys, and central nervous system (CNS); however, the heart and peripheral nerves appear to be the main targets of the TTR-related pathologic process. Without treatment, the prognosis is poor, with an average life expectancy of 7-11 years; however, in recent years, the development of new therapeutics has brought new hope to patients.

Here are five things to know about hereditary amyloidosis.
 

1. Diagnosis of hereditary amyloidosis requires a high level of suspicion.

The diagnosis of hATTR amyloidosis presents a significant challenge, particularly in nonendemic regions where a lack of family history and heterogeneity of clinical presentation can delay diagnosis by 4-5 years. A timely diagnosis requires clinicians to maintain a high index of suspicion, especially when evaluating patients with neuropathic symptoms. Early diagnosis is crucial to begin patients on recently available disease-modifying therapies that can slow the disease course. Failure to recognize is the major barrier to improved patient outcomes.

Confirming the diagnosis involves detecting amyloid deposits in tissue biopsy specimens from various possible sites, including the skin, nerves, myocardium, and others. However, the diagnosis can be challenging owing to the uneven distribution of amyloid fibrils, sometimes requiring multiple biopsies or alternative diagnostic approaches, such as TTR gene sequencing, to confirm the presence of an amyloidogenic pathogenic variant. Biopsy for hATTR amyloidosis is not required if imaging of the clinical phenotype and genetic testing are consistent.

Once diagnosed, the assessment of organ involvement is essential, using nerve conduction studies, cardiac investigations (eg, echocardiography, ECG, scintigraphy), ophthalmologic assessments, and complete renal function evaluations to fully understand the extent of disease impact.
 

2. Hereditary amyloidosis diseases are classified into two primary categories.

Hereditary amyloidosis represents a group of diseases caused by inherited gene mutations and is classified into two main types: ATTR (transthyretin-related) and non-TTR. Most cases of hereditary amyloidosis are associated with the TTR gene. Mutations in this protein lead to different forms of ATTR amyloidosis, categorized on the basis of the specific mutation involved, such as hATTR50M (genotype Val50Met), which is the most prevalent form.

ATTR mutations result in a variety of health issues, manifesting in three primary forms:

• Neuropathic ATTR (genotype Val50Met): Early symptoms include sensorimotor polyneuropathy of the legs, carpal tunnel syndrome, autonomic dysfunction, constipation/diarrhea, and impotence; late symptoms include cardiomyopathy, vitreous opacities, glaucoma, nephropathy, and CNS symptoms.
• Cardiac ATTR (genotype Val142Ile): This type is characterized by cardiomegaly, conduction block, arrhythmia, anginal pain, congestive heart failure, and sudden death.
• Leptomeningeal ATTR (genotype Asp38Gly): This is characterized by transient focal neurologic episodes, intracerebral and/or subarachnoid hemorrhages, dementia, ataxia, and psychosis.

Non-TTR amyloidoses are rarer than are ATTR variations and involve mutations in different genes that also have significant health impacts. These include proteins such as apolipoprotein AI, fibrinogen A alpha, lysozyme, apolipoprotein AII, gelsolin, and cystatin C. Each type contributes to a range of symptoms and requires individualized management approaches.
 

3. Heightened disease awareness has increased the recognized prevalence of hereditary amyloidosis.

hATTR amyloidosis has historically been recognized as a rare disease, with significant clusters in Portugal, Brazil, Sweden, and Japan and alongside smaller foci in regions such as Cyprus and Majorca. This disease›s variable incidence across Europe is now perceived to be on the rise. It is attributed to heightened disease awareness among healthcare providers and the broader availability of genetic testing, extending its recognized impact to at least 29 countries globally. The genetic landscape of hATTR amyloidosis is diverse, with over 140 mutations identified in the TTR gene. Among these, the Val50Met mutation is particularly notable for its association with large patient clusters in the endemic regions.

Morbidity and mortality associated with hATTR amyloidosis are significant, with an average lifespan of 7-11 years post diagnosis; however, survival rates can vary widely depending on the specific genetic variant and organ involvement. Early diagnosis can substantially improve outcomes; yet, for many, the prognosis remains poor, especially in cases dominated by cardiomyopathy. Genetics play a central role in the disease›s transmission, with autosomal-dominant inheritance patterns and high penetrance among carriers of pathogenic mutations. Research continues to uncover the broad spectrum of genetic variations contributing to hATTR amyloidosis, with ongoing studies poised to expand our understanding of its molecular underpinnings and potential treatment options.

4. The effect on quality of life is significant both in patients living with hATTR amyloidosis and their caregivers.

hATTR amyloidosis imposes a multifaceted burden on patients and their caregivers as the disease progresses. Symptoms range from sensorimotor impairment and gastrointestinal or autonomic dysfunction to heart failure, leading to significant health-related quality-of-life deficits. The systemic nature of hATTR amyloidosis significantly affects patients› lifestyles, daily activities, and general well-being, especially because it typically manifests in adulthood — a crucial time for occupational changes. The progression of hATTR amyloidosis exacerbates the challenges in maintaining employment and managing household chores, with symptomatic patients often unable to work and experiencing difficulties with absenteeism and presenteeism when they are able to work.

hATTR amyloidosis leads to physical, mental, occupational, and social limitations for patients, and it also places a considerable strain on their families and caregivers, who report poor mental health, work impairment, and a high time commitment (mean, 45.9 h/wk) to providing care.

5. There have been significant advancements in therapeutic options for early-stage hATTR amyloidosis.

After diagnosis, prompt initiation of treatment is recommended to delay the progression of hATTR amyloidosis; a multidisciplinary approach is essential, incorporating anti-amyloid therapy to inhibit further production and/or deposition of amyloid aggregates. Treatment strategies also include addressing symptomatic therapy and managing cardiac, renal, and ocular involvement. Although many therapies have been developed, especially for the early stages of hATTR amyloidosis, therapeutic benefits for patients with advanced disease remain limited.

Recent advancements in the treatment of hATTR amyloidosis have introduced RNA-targeted therapies including patisiran, vutrisiran, and eplontersen, which have shown efficacy in reducing hepatic TTR synthesis and the aggregation of misfolded monomers into amyloid deposits. These therapies, ranging from small interfering RNA formulations to antisense oligonucleotides, offer benefits in managing both cardiomyopathy and neuropathy associated with hATTR amyloidosis , administered through various methods, including intravenous infusions and subcutaneous injections. In addition, the stabilization of TTR tetramers with the use of drugs such as tafamidis and diflunisal has effectively prevented the formation of amyloidogenic monomers. Moreover, other investigational agents, including TTR stabilizers like acoramidis and tolcapone, as well as novel compounds that inhibit amyloid formation and disrupt fibrils, are expanding the therapeutic landscape for hATTR amyloidosis , providing hope for improved management of this complex condition.

Dr. Gertz is a professor and consultant in the Department of Hematology, Mayo Clinic, Rochester, Minnesota. He has disclosed the following relevant financial relationships: Received income in an amount equal to or greater than $250 from AstraZeneca, Ionis, and Alnylym.

A version of this article appeared on Medscape.com.

Amyloidosis is a condition marked by the accumulation of insoluble beta-sheet fibrillar protein aggregates in tissues that can be acquired or hereditary. Hereditary amyloidogenic transthyretin (hATTR) amyloidosis is an autosomal-dominant disease caused by pathogenic variants in the TTR gene. The TTR protein is essential for transporting thyroxine and retinol-binding protein and is primarily synthesized in the liver, becoming unstable as a result of the pathogenic mutations. Inherited pathogenic variants lead to the protein’s misfolding, aggregation, and deposition as amyloid fibrils in different organs, resulting in progressive multisystem dysfunction. hATTR amyloidosis is a heterogenous disease, characterized by a wide range of clinical manifestations affecting the peripheral (both somatic and autonomic) nervous system, heart, kidneys, and central nervous system (CNS); however, the heart and peripheral nerves appear to be the main targets of the TTR-related pathologic process. Without treatment, the prognosis is poor, with an average life expectancy of 7-11 years; however, in recent years, the development of new therapeutics has brought new hope to patients.

Here are five things to know about hereditary amyloidosis.
 

1. Diagnosis of hereditary amyloidosis requires a high level of suspicion.

The diagnosis of hATTR amyloidosis presents a significant challenge, particularly in nonendemic regions where a lack of family history and heterogeneity of clinical presentation can delay diagnosis by 4-5 years. A timely diagnosis requires clinicians to maintain a high index of suspicion, especially when evaluating patients with neuropathic symptoms. Early diagnosis is crucial to begin patients on recently available disease-modifying therapies that can slow the disease course. Failure to recognize is the major barrier to improved patient outcomes.

Confirming the diagnosis involves detecting amyloid deposits in tissue biopsy specimens from various possible sites, including the skin, nerves, myocardium, and others. However, the diagnosis can be challenging owing to the uneven distribution of amyloid fibrils, sometimes requiring multiple biopsies or alternative diagnostic approaches, such as TTR gene sequencing, to confirm the presence of an amyloidogenic pathogenic variant. Biopsy for hATTR amyloidosis is not required if imaging of the clinical phenotype and genetic testing are consistent.

Once diagnosed, the assessment of organ involvement is essential, using nerve conduction studies, cardiac investigations (eg, echocardiography, ECG, scintigraphy), ophthalmologic assessments, and complete renal function evaluations to fully understand the extent of disease impact.
 

2. Hereditary amyloidosis diseases are classified into two primary categories.

Hereditary amyloidosis represents a group of diseases caused by inherited gene mutations and is classified into two main types: ATTR (transthyretin-related) and non-TTR. Most cases of hereditary amyloidosis are associated with the TTR gene. Mutations in this protein lead to different forms of ATTR amyloidosis, categorized on the basis of the specific mutation involved, such as hATTR50M (genotype Val50Met), which is the most prevalent form.

ATTR mutations result in a variety of health issues, manifesting in three primary forms:

• Neuropathic ATTR (genotype Val50Met): Early symptoms include sensorimotor polyneuropathy of the legs, carpal tunnel syndrome, autonomic dysfunction, constipation/diarrhea, and impotence; late symptoms include cardiomyopathy, vitreous opacities, glaucoma, nephropathy, and CNS symptoms.
• Cardiac ATTR (genotype Val142Ile): This type is characterized by cardiomegaly, conduction block, arrhythmia, anginal pain, congestive heart failure, and sudden death.
• Leptomeningeal ATTR (genotype Asp38Gly): This is characterized by transient focal neurologic episodes, intracerebral and/or subarachnoid hemorrhages, dementia, ataxia, and psychosis.

Non-TTR amyloidoses are rarer than are ATTR variations and involve mutations in different genes that also have significant health impacts. These include proteins such as apolipoprotein AI, fibrinogen A alpha, lysozyme, apolipoprotein AII, gelsolin, and cystatin C. Each type contributes to a range of symptoms and requires individualized management approaches.
 

3. Heightened disease awareness has increased the recognized prevalence of hereditary amyloidosis.

hATTR amyloidosis has historically been recognized as a rare disease, with significant clusters in Portugal, Brazil, Sweden, and Japan and alongside smaller foci in regions such as Cyprus and Majorca. This disease›s variable incidence across Europe is now perceived to be on the rise. It is attributed to heightened disease awareness among healthcare providers and the broader availability of genetic testing, extending its recognized impact to at least 29 countries globally. The genetic landscape of hATTR amyloidosis is diverse, with over 140 mutations identified in the TTR gene. Among these, the Val50Met mutation is particularly notable for its association with large patient clusters in the endemic regions.

Morbidity and mortality associated with hATTR amyloidosis are significant, with an average lifespan of 7-11 years post diagnosis; however, survival rates can vary widely depending on the specific genetic variant and organ involvement. Early diagnosis can substantially improve outcomes; yet, for many, the prognosis remains poor, especially in cases dominated by cardiomyopathy. Genetics play a central role in the disease›s transmission, with autosomal-dominant inheritance patterns and high penetrance among carriers of pathogenic mutations. Research continues to uncover the broad spectrum of genetic variations contributing to hATTR amyloidosis, with ongoing studies poised to expand our understanding of its molecular underpinnings and potential treatment options.

4. The effect on quality of life is significant both in patients living with hATTR amyloidosis and their caregivers.

hATTR amyloidosis imposes a multifaceted burden on patients and their caregivers as the disease progresses. Symptoms range from sensorimotor impairment and gastrointestinal or autonomic dysfunction to heart failure, leading to significant health-related quality-of-life deficits. The systemic nature of hATTR amyloidosis significantly affects patients› lifestyles, daily activities, and general well-being, especially because it typically manifests in adulthood — a crucial time for occupational changes. The progression of hATTR amyloidosis exacerbates the challenges in maintaining employment and managing household chores, with symptomatic patients often unable to work and experiencing difficulties with absenteeism and presenteeism when they are able to work.

hATTR amyloidosis leads to physical, mental, occupational, and social limitations for patients, and it also places a considerable strain on their families and caregivers, who report poor mental health, work impairment, and a high time commitment (mean, 45.9 h/wk) to providing care.

5. There have been significant advancements in therapeutic options for early-stage hATTR amyloidosis.

After diagnosis, prompt initiation of treatment is recommended to delay the progression of hATTR amyloidosis; a multidisciplinary approach is essential, incorporating anti-amyloid therapy to inhibit further production and/or deposition of amyloid aggregates. Treatment strategies also include addressing symptomatic therapy and managing cardiac, renal, and ocular involvement. Although many therapies have been developed, especially for the early stages of hATTR amyloidosis, therapeutic benefits for patients with advanced disease remain limited.

Recent advancements in the treatment of hATTR amyloidosis have introduced RNA-targeted therapies including patisiran, vutrisiran, and eplontersen, which have shown efficacy in reducing hepatic TTR synthesis and the aggregation of misfolded monomers into amyloid deposits. These therapies, ranging from small interfering RNA formulations to antisense oligonucleotides, offer benefits in managing both cardiomyopathy and neuropathy associated with hATTR amyloidosis , administered through various methods, including intravenous infusions and subcutaneous injections. In addition, the stabilization of TTR tetramers with the use of drugs such as tafamidis and diflunisal has effectively prevented the formation of amyloidogenic monomers. Moreover, other investigational agents, including TTR stabilizers like acoramidis and tolcapone, as well as novel compounds that inhibit amyloid formation and disrupt fibrils, are expanding the therapeutic landscape for hATTR amyloidosis , providing hope for improved management of this complex condition.

Dr. Gertz is a professor and consultant in the Department of Hematology, Mayo Clinic, Rochester, Minnesota. He has disclosed the following relevant financial relationships: Received income in an amount equal to or greater than $250 from AstraZeneca, Ionis, and Alnylym.

A version of this article appeared on Medscape.com.

Amyloidosis is a condition marked by the accumulation of insoluble beta-sheet fibrillar protein aggregates in tissues that can be acquired or hereditary. Hereditary amyloidogenic transthyretin (hATTR) amyloidosis is an autosomal-dominant disease caused by pathogenic variants in the TTR gene. The TTR protein is essential for transporting thyroxine and retinol-binding protein and is primarily synthesized in the liver, becoming unstable as a result of the pathogenic mutations. Inherited pathogenic variants lead to the protein’s misfolding, aggregation, and deposition as amyloid fibrils in different organs, resulting in progressive multisystem dysfunction. hATTR amyloidosis is a heterogenous disease, characterized by a wide range of clinical manifestations affecting the peripheral (both somatic and autonomic) nervous system, heart, kidneys, and central nervous system (CNS); however, the heart and peripheral nerves appear to be the main targets of the TTR-related pathologic process. Without treatment, the prognosis is poor, with an average life expectancy of 7-11 years; however, in recent years, the development of new therapeutics has brought new hope to patients.

Here are five things to know about hereditary amyloidosis.
 

1. Diagnosis of hereditary amyloidosis requires a high level of suspicion.

The diagnosis of hATTR amyloidosis presents a significant challenge, particularly in nonendemic regions where a lack of family history and heterogeneity of clinical presentation can delay diagnosis by 4-5 years. A timely diagnosis requires clinicians to maintain a high index of suspicion, especially when evaluating patients with neuropathic symptoms. Early diagnosis is crucial to begin patients on recently available disease-modifying therapies that can slow the disease course. Failure to recognize is the major barrier to improved patient outcomes.

Confirming the diagnosis involves detecting amyloid deposits in tissue biopsy specimens from various possible sites, including the skin, nerves, myocardium, and others. However, the diagnosis can be challenging owing to the uneven distribution of amyloid fibrils, sometimes requiring multiple biopsies or alternative diagnostic approaches, such as TTR gene sequencing, to confirm the presence of an amyloidogenic pathogenic variant. Biopsy for hATTR amyloidosis is not required if imaging of the clinical phenotype and genetic testing are consistent.

Once diagnosed, the assessment of organ involvement is essential, using nerve conduction studies, cardiac investigations (eg, echocardiography, ECG, scintigraphy), ophthalmologic assessments, and complete renal function evaluations to fully understand the extent of disease impact.
 

2. Hereditary amyloidosis diseases are classified into two primary categories.

Hereditary amyloidosis represents a group of diseases caused by inherited gene mutations and is classified into two main types: ATTR (transthyretin-related) and non-TTR. Most cases of hereditary amyloidosis are associated with the TTR gene. Mutations in this protein lead to different forms of ATTR amyloidosis, categorized on the basis of the specific mutation involved, such as hATTR50M (genotype Val50Met), which is the most prevalent form.

ATTR mutations result in a variety of health issues, manifesting in three primary forms:

• Neuropathic ATTR (genotype Val50Met): Early symptoms include sensorimotor polyneuropathy of the legs, carpal tunnel syndrome, autonomic dysfunction, constipation/diarrhea, and impotence; late symptoms include cardiomyopathy, vitreous opacities, glaucoma, nephropathy, and CNS symptoms.
• Cardiac ATTR (genotype Val142Ile): This type is characterized by cardiomegaly, conduction block, arrhythmia, anginal pain, congestive heart failure, and sudden death.
• Leptomeningeal ATTR (genotype Asp38Gly): This is characterized by transient focal neurologic episodes, intracerebral and/or subarachnoid hemorrhages, dementia, ataxia, and psychosis.

Non-TTR amyloidoses are rarer than are ATTR variations and involve mutations in different genes that also have significant health impacts. These include proteins such as apolipoprotein AI, fibrinogen A alpha, lysozyme, apolipoprotein AII, gelsolin, and cystatin C. Each type contributes to a range of symptoms and requires individualized management approaches.
 

3. Heightened disease awareness has increased the recognized prevalence of hereditary amyloidosis.

hATTR amyloidosis has historically been recognized as a rare disease, with significant clusters in Portugal, Brazil, Sweden, and Japan and alongside smaller foci in regions such as Cyprus and Majorca. This disease›s variable incidence across Europe is now perceived to be on the rise. It is attributed to heightened disease awareness among healthcare providers and the broader availability of genetic testing, extending its recognized impact to at least 29 countries globally. The genetic landscape of hATTR amyloidosis is diverse, with over 140 mutations identified in the TTR gene. Among these, the Val50Met mutation is particularly notable for its association with large patient clusters in the endemic regions.

Morbidity and mortality associated with hATTR amyloidosis are significant, with an average lifespan of 7-11 years post diagnosis; however, survival rates can vary widely depending on the specific genetic variant and organ involvement. Early diagnosis can substantially improve outcomes; yet, for many, the prognosis remains poor, especially in cases dominated by cardiomyopathy. Genetics play a central role in the disease›s transmission, with autosomal-dominant inheritance patterns and high penetrance among carriers of pathogenic mutations. Research continues to uncover the broad spectrum of genetic variations contributing to hATTR amyloidosis, with ongoing studies poised to expand our understanding of its molecular underpinnings and potential treatment options.

4. The effect on quality of life is significant both in patients living with hATTR amyloidosis and their caregivers.

hATTR amyloidosis imposes a multifaceted burden on patients and their caregivers as the disease progresses. Symptoms range from sensorimotor impairment and gastrointestinal or autonomic dysfunction to heart failure, leading to significant health-related quality-of-life deficits. The systemic nature of hATTR amyloidosis significantly affects patients› lifestyles, daily activities, and general well-being, especially because it typically manifests in adulthood — a crucial time for occupational changes. The progression of hATTR amyloidosis exacerbates the challenges in maintaining employment and managing household chores, with symptomatic patients often unable to work and experiencing difficulties with absenteeism and presenteeism when they are able to work.

hATTR amyloidosis leads to physical, mental, occupational, and social limitations for patients, and it also places a considerable strain on their families and caregivers, who report poor mental health, work impairment, and a high time commitment (mean, 45.9 h/wk) to providing care.

5. There have been significant advancements in therapeutic options for early-stage hATTR amyloidosis.

After diagnosis, prompt initiation of treatment is recommended to delay the progression of hATTR amyloidosis; a multidisciplinary approach is essential, incorporating anti-amyloid therapy to inhibit further production and/or deposition of amyloid aggregates. Treatment strategies also include addressing symptomatic therapy and managing cardiac, renal, and ocular involvement. Although many therapies have been developed, especially for the early stages of hATTR amyloidosis, therapeutic benefits for patients with advanced disease remain limited.

Recent advancements in the treatment of hATTR amyloidosis have introduced RNA-targeted therapies including patisiran, vutrisiran, and eplontersen, which have shown efficacy in reducing hepatic TTR synthesis and the aggregation of misfolded monomers into amyloid deposits. These therapies, ranging from small interfering RNA formulations to antisense oligonucleotides, offer benefits in managing both cardiomyopathy and neuropathy associated with hATTR amyloidosis , administered through various methods, including intravenous infusions and subcutaneous injections. In addition, the stabilization of TTR tetramers with the use of drugs such as tafamidis and diflunisal has effectively prevented the formation of amyloidogenic monomers. Moreover, other investigational agents, including TTR stabilizers like acoramidis and tolcapone, as well as novel compounds that inhibit amyloid formation and disrupt fibrils, are expanding the therapeutic landscape for hATTR amyloidosis , providing hope for improved management of this complex condition.

Dr. Gertz is a professor and consultant in the Department of Hematology, Mayo Clinic, Rochester, Minnesota. He has disclosed the following relevant financial relationships: Received income in an amount equal to or greater than $250 from AstraZeneca, Ionis, and Alnylym.

A version of this article appeared on Medscape.com.