MDedge Dermatology

CHICAGO – Sunscreen recommendations are most effective when a multitude of factors are considered, Susan C. Taylor, MD, said during a presentation on personal photoprotection at the inaugural Pigmentary Disorders Exchange Symposium.

Among the first factors physicians should consider before recommending sunscreen are a patient’s Fitzpatrick skin type, risks for burning or tanning, underlying skin disorders, and medications the patient is taking, Dr. Taylor, professor of dermatology at the University of Pennsylvania, Philadelphia, said at the meeting, provided by MedscapeLIVE! If patients are on hypertensives, for example, medications can make them more photosensitive.

MedscapeLIVE!

Consider skin type

Dr. Taylor said she was dismayed by the results of a recent study, which found that 43% of dermatologists who responded to a survey reported that they never, rarely, or only sometimes took a patient’s skin type into account when making sunscreen recommendations. The article is referenced in a 2022 expert panel consensus paper she coauthored on photoprotection “for skin of all color.” But she pointed out that considering skin type alone is inadequate.

Questions for patients in joint decision-making should include lifestyle and work choices such as whether they work inside or outside, and how much sun exposure they get in a typical day. Heat and humidity levels should also be considered as should a patient’s susceptibility to dyspigmentation. “That could be overall darkening of the skin, mottled hyperpigmentation, actinic dyspigmentation, and, of course, propensity for skin cancer,” she said.
 

Use differs by race

Dr. Taylor, who is also vice chair for diversity, equity and inclusion in the department of dermatology at the University of Pennsylvania, pointed out that sunscreen use differs considerably by race.

In study of 8,952 adults in the United States who reported that they were sun sensitive found that a subset of adults with skin of color were significantly less likely to use sunscreen when compared with non-Hispanic White adults: Non-Hispanic Black (adjusted odds ratio, 0.43); non-Hispanic Asian (aOR. 0.54); and Hispanic (aOR, 0.70) adults.

In the study, non-Hispanic Black and Hispanic adults were significantly less likely to use sunscreens with an SPF greater than 15. In addition, non-Hispanic Black, non-Hispanic Asian, and Hispanic adults were significantly more likely than non-Hispanic Whites to wear long sleeves when outside. Such differences are important to keep in mind when advising patients about sunscreens, she said.
 

Protection for lighter-colored skin

Dr. Taylor said that, for patients with lighter skin tones, “we really want to protect against ultraviolet B as well as ultraviolet A, particularly ultraviolet A2. Ultraviolet radiation is going to cause DNA damage.” Patients with Fitzpatrick skin types I, II, or III are most susceptible to the effects of UVB with sunburn inflammation, which will cause erythema and tanning, and immunosuppression.

“For those who are I, II, and III, we do want to recommend a broad-spectrum, photostable sunscreen with a critical wavelength of 370 nanometers, which is going to protect from both UVB and UVA2,” she said.

Sunscreen recommendations are meant to be paired with advice to avoid midday sun from 10 a.m. to 2 p.m., wearing protective clothing and accessories, and seeking shade, she noted.

Dr. Taylor said, for those patients with lighter skin who are more susceptible to photodamage and premature aging, physicians should recommend sunscreens that contain DNA repair enzymes such as photolyases and sunscreens that contain antioxidants that can prevent or reverse DNA damage. “The exogenous form of these lyases have been manufactured and added to sunscreens,” Dr. Taylor said. “They’re readily available in the United States. That is something to consider for patients with significant photodamage.”

Retinoids can also help alleviate or reverse photodamage, she added.
 

Protection for darker-colored skin

“Many people of color do not believe they need sunscreen,” Dr. Taylor said. But studies show that, although there may be more intrinsic protection, sunscreen is still needed.

Over 30 years ago, Halder and colleagues reported that melanin in skin of color can filter two to five times more UV radiation, and in a paper on the photoprotective role of melanin, Kaidbey and colleagues found that skin types V and VI had an intrinsic SPF of 13 when compared with those who have lighter complexions, which had an SPF of 3.

Sunburns seem to occur less frequently in people with skin of color, but that may be because erythema is less apparent in people with darker skin tones or because of differences in personal definitions of sunburn, Dr. Taylor said.

“Skin of color can and does sustain sunburns and sunscreen will help prevent that,” she said, adding that a recommendation of an SPF 30 is likely sufficient for these patients. Dr. Taylor noted that sunscreens for patients with darker skin often cost substantially more than those for lighter skin, and that should be considered in recommendations.

Tinted sunscreens

Dr. Taylor said that, while broad-spectrum photostable sunscreens protect against UVB and UVA 2, they don’t protect from visible light and UVA1. Two methods to add that protection are using inorganic tinted sunscreens that contain iron oxide or pigmentary titanium dioxide. Dr. Taylor was a coauthor of a practical guide to tinted sunscreens published in 2022.

“For iron oxide, we want a concentration of 3% or greater,” she said, adding that the percentage often is not known because if it is contained in a sunscreen, it is listed as an inactive ingredient.

Another method to address visible light and UVA1 is the use of antioxidant-containing sunscreens with vitamin E, vitamin C, or licochalcone A, Dr. Taylor said.

During the question-and-answer period following her presentation, Amit Pandya, MD, adjunct professor of dermatology at University of Texas Southwestern Medical Center, Dallas, asked why “every makeup, every sunscreen, just says iron oxide,” since it is known that visible light will cause pigmentation, especially in those with darker skin tones.

He urged pushing for a law that would require listing the percentage of iron oxide on products to assure it is sufficient, according to what the literature recommends.

Conference Chair Pearl Grimes, MD, director of the Vitiligo and Pigmentation Institute of Southern California, Los Angeles, said that she recommends tinted sunscreens almost exclusively for her patients, but those with darker skin colors struggle to match color.

Dr. Taylor referred to an analysis published in 2022 of 58 over-the counter sunscreens, which found that only 38% of tinted sunscreens was available in more than one shade, “which is a problem for many of our patients.” She said that providing samples with different hues and tactile sensations may help patients find the right product.

Dr. Taylor disclosed being on the advisory boards for AbbVie, Avita Medical, Beiersdorf, Biorez, Eli Lily, EPI Health, Evolus, Galderma, Hugel America, Johnson and Johnson, L’Oreal USA, MedScape, Pfizer, Scientis US, UCB, Vichy Laboratories. She is a consultant for Arcutis Biothermapeutics, Beiersdorf, Bristol-Myers Squibb, Cara Therapeutics, Dior, and Sanofi. She has done contracted research for Allergan Aesthetics, Concert Pharmaceuticals, Croma-Pharma, Eli Lilly, and Pfizer, and has an ownership interest in Armis Scientific, GloGetter, and Piction Health.

Medscape and this news organization are owned by the same parent company.

CHICAGO – Sunscreen recommendations are most effective when a multitude of factors are considered, Susan C. Taylor, MD, said during a presentation on personal photoprotection at the inaugural Pigmentary Disorders Exchange Symposium.

Among the first factors physicians should consider before recommending sunscreen are a patient’s Fitzpatrick skin type, risks for burning or tanning, underlying skin disorders, and medications the patient is taking, Dr. Taylor, professor of dermatology at the University of Pennsylvania, Philadelphia, said at the meeting, provided by MedscapeLIVE! If patients are on hypertensives, for example, medications can make them more photosensitive.

MedscapeLIVE!

Consider skin type

Dr. Taylor said she was dismayed by the results of a recent study, which found that 43% of dermatologists who responded to a survey reported that they never, rarely, or only sometimes took a patient’s skin type into account when making sunscreen recommendations. The article is referenced in a 2022 expert panel consensus paper she coauthored on photoprotection “for skin of all color.” But she pointed out that considering skin type alone is inadequate.

Questions for patients in joint decision-making should include lifestyle and work choices such as whether they work inside or outside, and how much sun exposure they get in a typical day. Heat and humidity levels should also be considered as should a patient’s susceptibility to dyspigmentation. “That could be overall darkening of the skin, mottled hyperpigmentation, actinic dyspigmentation, and, of course, propensity for skin cancer,” she said.
 

Use differs by race

Dr. Taylor, who is also vice chair for diversity, equity and inclusion in the department of dermatology at the University of Pennsylvania, pointed out that sunscreen use differs considerably by race.

In study of 8,952 adults in the United States who reported that they were sun sensitive found that a subset of adults with skin of color were significantly less likely to use sunscreen when compared with non-Hispanic White adults: Non-Hispanic Black (adjusted odds ratio, 0.43); non-Hispanic Asian (aOR. 0.54); and Hispanic (aOR, 0.70) adults.

In the study, non-Hispanic Black and Hispanic adults were significantly less likely to use sunscreens with an SPF greater than 15. In addition, non-Hispanic Black, non-Hispanic Asian, and Hispanic adults were significantly more likely than non-Hispanic Whites to wear long sleeves when outside. Such differences are important to keep in mind when advising patients about sunscreens, she said.
 

Protection for lighter-colored skin

Dr. Taylor said that, for patients with lighter skin tones, “we really want to protect against ultraviolet B as well as ultraviolet A, particularly ultraviolet A2. Ultraviolet radiation is going to cause DNA damage.” Patients with Fitzpatrick skin types I, II, or III are most susceptible to the effects of UVB with sunburn inflammation, which will cause erythema and tanning, and immunosuppression.

“For those who are I, II, and III, we do want to recommend a broad-spectrum, photostable sunscreen with a critical wavelength of 370 nanometers, which is going to protect from both UVB and UVA2,” she said.

Sunscreen recommendations are meant to be paired with advice to avoid midday sun from 10 a.m. to 2 p.m., wearing protective clothing and accessories, and seeking shade, she noted.

Dr. Taylor said, for those patients with lighter skin who are more susceptible to photodamage and premature aging, physicians should recommend sunscreens that contain DNA repair enzymes such as photolyases and sunscreens that contain antioxidants that can prevent or reverse DNA damage. “The exogenous form of these lyases have been manufactured and added to sunscreens,” Dr. Taylor said. “They’re readily available in the United States. That is something to consider for patients with significant photodamage.”

Retinoids can also help alleviate or reverse photodamage, she added.
 

Protection for darker-colored skin

“Many people of color do not believe they need sunscreen,” Dr. Taylor said. But studies show that, although there may be more intrinsic protection, sunscreen is still needed.

Over 30 years ago, Halder and colleagues reported that melanin in skin of color can filter two to five times more UV radiation, and in a paper on the photoprotective role of melanin, Kaidbey and colleagues found that skin types V and VI had an intrinsic SPF of 13 when compared with those who have lighter complexions, which had an SPF of 3.

Sunburns seem to occur less frequently in people with skin of color, but that may be because erythema is less apparent in people with darker skin tones or because of differences in personal definitions of sunburn, Dr. Taylor said.

“Skin of color can and does sustain sunburns and sunscreen will help prevent that,” she said, adding that a recommendation of an SPF 30 is likely sufficient for these patients. Dr. Taylor noted that sunscreens for patients with darker skin often cost substantially more than those for lighter skin, and that should be considered in recommendations.

Tinted sunscreens

Dr. Taylor said that, while broad-spectrum photostable sunscreens protect against UVB and UVA 2, they don’t protect from visible light and UVA1. Two methods to add that protection are using inorganic tinted sunscreens that contain iron oxide or pigmentary titanium dioxide. Dr. Taylor was a coauthor of a practical guide to tinted sunscreens published in 2022.

“For iron oxide, we want a concentration of 3% or greater,” she said, adding that the percentage often is not known because if it is contained in a sunscreen, it is listed as an inactive ingredient.

Another method to address visible light and UVA1 is the use of antioxidant-containing sunscreens with vitamin E, vitamin C, or licochalcone A, Dr. Taylor said.

During the question-and-answer period following her presentation, Amit Pandya, MD, adjunct professor of dermatology at University of Texas Southwestern Medical Center, Dallas, asked why “every makeup, every sunscreen, just says iron oxide,” since it is known that visible light will cause pigmentation, especially in those with darker skin tones.

He urged pushing for a law that would require listing the percentage of iron oxide on products to assure it is sufficient, according to what the literature recommends.

Conference Chair Pearl Grimes, MD, director of the Vitiligo and Pigmentation Institute of Southern California, Los Angeles, said that she recommends tinted sunscreens almost exclusively for her patients, but those with darker skin colors struggle to match color.

Dr. Taylor referred to an analysis published in 2022 of 58 over-the counter sunscreens, which found that only 38% of tinted sunscreens was available in more than one shade, “which is a problem for many of our patients.” She said that providing samples with different hues and tactile sensations may help patients find the right product.

Dr. Taylor disclosed being on the advisory boards for AbbVie, Avita Medical, Beiersdorf, Biorez, Eli Lily, EPI Health, Evolus, Galderma, Hugel America, Johnson and Johnson, L’Oreal USA, MedScape, Pfizer, Scientis US, UCB, Vichy Laboratories. She is a consultant for Arcutis Biothermapeutics, Beiersdorf, Bristol-Myers Squibb, Cara Therapeutics, Dior, and Sanofi. She has done contracted research for Allergan Aesthetics, Concert Pharmaceuticals, Croma-Pharma, Eli Lilly, and Pfizer, and has an ownership interest in Armis Scientific, GloGetter, and Piction Health.

Medscape and this news organization are owned by the same parent company.

CHICAGO – Sunscreen recommendations are most effective when a multitude of factors are considered, Susan C. Taylor, MD, said during a presentation on personal photoprotection at the inaugural Pigmentary Disorders Exchange Symposium.

Among the first factors physicians should consider before recommending sunscreen are a patient’s Fitzpatrick skin type, risks for burning or tanning, underlying skin disorders, and medications the patient is taking, Dr. Taylor, professor of dermatology at the University of Pennsylvania, Philadelphia, said at the meeting, provided by MedscapeLIVE! If patients are on hypertensives, for example, medications can make them more photosensitive.

MedscapeLIVE!

Consider skin type

Dr. Taylor said she was dismayed by the results of a recent study, which found that 43% of dermatologists who responded to a survey reported that they never, rarely, or only sometimes took a patient’s skin type into account when making sunscreen recommendations. The article is referenced in a 2022 expert panel consensus paper she coauthored on photoprotection “for skin of all color.” But she pointed out that considering skin type alone is inadequate.

Questions for patients in joint decision-making should include lifestyle and work choices such as whether they work inside or outside, and how much sun exposure they get in a typical day. Heat and humidity levels should also be considered as should a patient’s susceptibility to dyspigmentation. “That could be overall darkening of the skin, mottled hyperpigmentation, actinic dyspigmentation, and, of course, propensity for skin cancer,” she said.
 

Use differs by race

Dr. Taylor, who is also vice chair for diversity, equity and inclusion in the department of dermatology at the University of Pennsylvania, pointed out that sunscreen use differs considerably by race.

In study of 8,952 adults in the United States who reported that they were sun sensitive found that a subset of adults with skin of color were significantly less likely to use sunscreen when compared with non-Hispanic White adults: Non-Hispanic Black (adjusted odds ratio, 0.43); non-Hispanic Asian (aOR. 0.54); and Hispanic (aOR, 0.70) adults.

In the study, non-Hispanic Black and Hispanic adults were significantly less likely to use sunscreens with an SPF greater than 15. In addition, non-Hispanic Black, non-Hispanic Asian, and Hispanic adults were significantly more likely than non-Hispanic Whites to wear long sleeves when outside. Such differences are important to keep in mind when advising patients about sunscreens, she said.
 

Protection for lighter-colored skin

Dr. Taylor said that, for patients with lighter skin tones, “we really want to protect against ultraviolet B as well as ultraviolet A, particularly ultraviolet A2. Ultraviolet radiation is going to cause DNA damage.” Patients with Fitzpatrick skin types I, II, or III are most susceptible to the effects of UVB with sunburn inflammation, which will cause erythema and tanning, and immunosuppression.

“For those who are I, II, and III, we do want to recommend a broad-spectrum, photostable sunscreen with a critical wavelength of 370 nanometers, which is going to protect from both UVB and UVA2,” she said.

Sunscreen recommendations are meant to be paired with advice to avoid midday sun from 10 a.m. to 2 p.m., wearing protective clothing and accessories, and seeking shade, she noted.

Dr. Taylor said, for those patients with lighter skin who are more susceptible to photodamage and premature aging, physicians should recommend sunscreens that contain DNA repair enzymes such as photolyases and sunscreens that contain antioxidants that can prevent or reverse DNA damage. “The exogenous form of these lyases have been manufactured and added to sunscreens,” Dr. Taylor said. “They’re readily available in the United States. That is something to consider for patients with significant photodamage.”

Retinoids can also help alleviate or reverse photodamage, she added.
 

Protection for darker-colored skin

“Many people of color do not believe they need sunscreen,” Dr. Taylor said. But studies show that, although there may be more intrinsic protection, sunscreen is still needed.

Over 30 years ago, Halder and colleagues reported that melanin in skin of color can filter two to five times more UV radiation, and in a paper on the photoprotective role of melanin, Kaidbey and colleagues found that skin types V and VI had an intrinsic SPF of 13 when compared with those who have lighter complexions, which had an SPF of 3.

Sunburns seem to occur less frequently in people with skin of color, but that may be because erythema is less apparent in people with darker skin tones or because of differences in personal definitions of sunburn, Dr. Taylor said.

“Skin of color can and does sustain sunburns and sunscreen will help prevent that,” she said, adding that a recommendation of an SPF 30 is likely sufficient for these patients. Dr. Taylor noted that sunscreens for patients with darker skin often cost substantially more than those for lighter skin, and that should be considered in recommendations.

Tinted sunscreens

Dr. Taylor said that, while broad-spectrum photostable sunscreens protect against UVB and UVA 2, they don’t protect from visible light and UVA1. Two methods to add that protection are using inorganic tinted sunscreens that contain iron oxide or pigmentary titanium dioxide. Dr. Taylor was a coauthor of a practical guide to tinted sunscreens published in 2022.

“For iron oxide, we want a concentration of 3% or greater,” she said, adding that the percentage often is not known because if it is contained in a sunscreen, it is listed as an inactive ingredient.

Another method to address visible light and UVA1 is the use of antioxidant-containing sunscreens with vitamin E, vitamin C, or licochalcone A, Dr. Taylor said.

During the question-and-answer period following her presentation, Amit Pandya, MD, adjunct professor of dermatology at University of Texas Southwestern Medical Center, Dallas, asked why “every makeup, every sunscreen, just says iron oxide,” since it is known that visible light will cause pigmentation, especially in those with darker skin tones.

He urged pushing for a law that would require listing the percentage of iron oxide on products to assure it is sufficient, according to what the literature recommends.

Conference Chair Pearl Grimes, MD, director of the Vitiligo and Pigmentation Institute of Southern California, Los Angeles, said that she recommends tinted sunscreens almost exclusively for her patients, but those with darker skin colors struggle to match color.

Dr. Taylor referred to an analysis published in 2022 of 58 over-the counter sunscreens, which found that only 38% of tinted sunscreens was available in more than one shade, “which is a problem for many of our patients.” She said that providing samples with different hues and tactile sensations may help patients find the right product.

Dr. Taylor disclosed being on the advisory boards for AbbVie, Avita Medical, Beiersdorf, Biorez, Eli Lily, EPI Health, Evolus, Galderma, Hugel America, Johnson and Johnson, L’Oreal USA, MedScape, Pfizer, Scientis US, UCB, Vichy Laboratories. She is a consultant for Arcutis Biothermapeutics, Beiersdorf, Bristol-Myers Squibb, Cara Therapeutics, Dior, and Sanofi. She has done contracted research for Allergan Aesthetics, Concert Pharmaceuticals, Croma-Pharma, Eli Lilly, and Pfizer, and has an ownership interest in Armis Scientific, GloGetter, and Piction Health.

Medscape and this news organization are owned by the same parent company.

MILAN – Results of a phase 3 trial with the investigational drug telitacicept show that patients with systemic lupus erythematosus have a significantly greater rate of response to SLE response criteria, compared with placebo, while results from a phase 2 trial of the drug in patients with primary Sjögren’s syndrome (pSS) also show significant improvements versus placebo.

“With only a limited number of treatments available for patients with lupus, this additional option is certainly an advance and the trial shows a strong efficacy result,” said Ronald van Vollenhoven, MD, PhD, who was not an investigator for either trial but presented the results for both at the annual European Congress of Rheumatology. He is professor of clinical immunology and rheumatology at Amsterdam University Medical Center and VU University Medical Center, also in Amsterdam.

Becky McCall/MDedge News

Telitacicept is a recombinant fusion protein that targets B-lymphocyte stimulator and a proliferating-inducing ligand. It is currently undergoing testing in another phase 3 trial (REMESLE-1) at sites in the United States, Europe, and Asia. The current SLE results relate to the phase 3 study conducted in China, Dr. van Vollenhoven clarified.
 

SLE trial

The double-blind, placebo-controlled trial included 335 patients with SLE who had an average age of 35 years, a body mass index of 22-23 kg/m², and a mean SELENA-SLEDAI (Safety of Estrogens in Systemic Lupus Erythematosus National Assessment–Systemic Lupus Erythematosus Disease Activity Index) score of at least 11.5, indicating high disease activity. Most patients were on glucocorticoids and immunosuppressants.

Patients were randomized 1:1 to weekly subcutaneous injections of telitacicept (160 mg; n = 167) or placebo (n = 168) in combination with standard therapy for 52 weeks. The primary endpoint was the SLE Responder Index-4 (SRI4) response rate at week 52, while key secondary endpoints included SELENA-SLEDAI, physician global assessment, and levels of immunologic biomarkers including C3, C4, IgM, IgG, IgA, and CD19+ B cells. Safety was also assessed.

At week 52, Dr. van Vollenhoven reported that significantly more patients taking telitacicept achieved a SRI4 response, compared with placebo, at 67.1% versus 32.7%, respectively (P < .001). “The difference was seen at 4-8 weeks and stabilized at around 20 weeks,” he said.

Time to first SLE flare was also reduced in patients on the trial drug at a median of 198 days (95% confidence interval, 169-254 days), compared with placebo at 115 days (95% CI, 92-140 days).

“The secondary outcomes also supported efficacy in these patients,” Dr. van Vollenhoven added, noting that there was a rapid and sustained increase of C3 and C4, the latter being significantly greater than placebo, and reduction of IgM, IgG, IgA, and CD19+ B cells observed following telitacicept treatment.

A significantly higher proportion of patients in the telitacicept group showed improvement in SELENA-SLEDAI at week 52, defined as a 4-point or greater reduction, compared with placebo (70.1% vs. 40.5%).

Telitacicept did not increase the risk of infections. Treatment-emergent adverse events occurred in 84.5% with telitacicept versus 91.6% with placebo, with infections (mostly upper respiratory) seen in 65.3% and 60.1%, respectively.
 

Sjögren’s trial

The second trial was a phase 2, randomized, placebo-controlled, 24-week study in 42 patients with pSS. Patients (18-65 years) received telitacicept at 160 mg or 240 mg subcutaneously once a week, or placebo, for a total of 24 doses. Patients had a EULAR Sjögren’s Syndrome Disease Activity Index (ESSDAI) score of 5 points or more, and were anti-SSA antibody positive.

“Compared with placebo, telitacicept treatment resulted in significant improvement in ESSDAI and MFI-20 [20-item Multidimensional Fatigue Inventory],” Dr. van Vollenhoven reported, adding that, “there was a trend for improvement in salivary gland function and lacrimal gland function relative to placebo, as well as a favorable safety profile.”

ESSDAI change from baseline was 0.5, –3.8, and –2.3 in placebo, 160-mg, and 240-mg telitacicept doses, respectively. MFI-20 change from baseline was 7.0, –4.0, and –5.1, respectively. Dr. Van Vollenhoven said the difference between the doses was not statistically significant.

“If these results are confirmed, it could be the first time a biologic is proven efficacious in this disease,” Dr. Van Vollenhoven said in an interview. “It’s encouraging to know that a new treatment is showing promise in this phase 2 trial. A phase 3 trial is warranted.”
 

Studies yield promising but confusing results

In an interview, Roy Fleischmann, MD, who was not involved with either study, wondered whether the results of the SLE study could be race specific given the magnitude of response to the drug and that the trial was conducted only in China, and whether the positive results of the small Sjögren’s study will pan out in a larger trial.

“The SLE study was very interesting, but the problem is that it’s a Chinese drug in Chinese patients with Chinese doctors, so they are very dramatic results,” he said, questioning whether “these results are race specific,” and that “we will find out when they do the multinational study, but we haven’t seen this type of separation before [in response]. It’s interesting.

“The Sjögren’s was a positive study, but it was confusing because the low dose seemed to be better than the higher dose, and there were very few patients,” said Dr. Fleischmann, clinical professor of medicine at the University of Texas Southwestern Medical Center and codirector of the Metroplex Clinical Research Center, both in Dallas. The left and right eyes gave different results, which was strange, and the salivary gland test was the same [mixed results], so what can we conclude? All in all, it was a small study with a suggestion of efficacy, but we have to do the phase 3 and see what it shows.”

Both trials were sponsored by RemeGen. Dr. van Vollenhoven reported serving as a paid adviser to AbbVie, AstraZeneca, Biogen, Bristol-Myers Squibb, Galapagos, GlaxoSmithKline, Janssen, Pfizer, RemeGen, and UCB. He has received research funding from Bristol-Myers Squibb and UCB and educational support from AstraZeneca, Galapagos, Merck Sharp & Dohme, Novartis, Pfizer, Roche, Sanofi, and UCB. Dr. Fleischmann said he had has no relevant financial relationships.

MILAN – Results of a phase 3 trial with the investigational drug telitacicept show that patients with systemic lupus erythematosus have a significantly greater rate of response to SLE response criteria, compared with placebo, while results from a phase 2 trial of the drug in patients with primary Sjögren’s syndrome (pSS) also show significant improvements versus placebo.

“With only a limited number of treatments available for patients with lupus, this additional option is certainly an advance and the trial shows a strong efficacy result,” said Ronald van Vollenhoven, MD, PhD, who was not an investigator for either trial but presented the results for both at the annual European Congress of Rheumatology. He is professor of clinical immunology and rheumatology at Amsterdam University Medical Center and VU University Medical Center, also in Amsterdam.

Becky McCall/MDedge News

Telitacicept is a recombinant fusion protein that targets B-lymphocyte stimulator and a proliferating-inducing ligand. It is currently undergoing testing in another phase 3 trial (REMESLE-1) at sites in the United States, Europe, and Asia. The current SLE results relate to the phase 3 study conducted in China, Dr. van Vollenhoven clarified.
 

SLE trial

The double-blind, placebo-controlled trial included 335 patients with SLE who had an average age of 35 years, a body mass index of 22-23 kg/m², and a mean SELENA-SLEDAI (Safety of Estrogens in Systemic Lupus Erythematosus National Assessment–Systemic Lupus Erythematosus Disease Activity Index) score of at least 11.5, indicating high disease activity. Most patients were on glucocorticoids and immunosuppressants.

Patients were randomized 1:1 to weekly subcutaneous injections of telitacicept (160 mg; n = 167) or placebo (n = 168) in combination with standard therapy for 52 weeks. The primary endpoint was the SLE Responder Index-4 (SRI4) response rate at week 52, while key secondary endpoints included SELENA-SLEDAI, physician global assessment, and levels of immunologic biomarkers including C3, C4, IgM, IgG, IgA, and CD19+ B cells. Safety was also assessed.

At week 52, Dr. van Vollenhoven reported that significantly more patients taking telitacicept achieved a SRI4 response, compared with placebo, at 67.1% versus 32.7%, respectively (P < .001). “The difference was seen at 4-8 weeks and stabilized at around 20 weeks,” he said.

Time to first SLE flare was also reduced in patients on the trial drug at a median of 198 days (95% confidence interval, 169-254 days), compared with placebo at 115 days (95% CI, 92-140 days).

“The secondary outcomes also supported efficacy in these patients,” Dr. van Vollenhoven added, noting that there was a rapid and sustained increase of C3 and C4, the latter being significantly greater than placebo, and reduction of IgM, IgG, IgA, and CD19+ B cells observed following telitacicept treatment.

A significantly higher proportion of patients in the telitacicept group showed improvement in SELENA-SLEDAI at week 52, defined as a 4-point or greater reduction, compared with placebo (70.1% vs. 40.5%).

Telitacicept did not increase the risk of infections. Treatment-emergent adverse events occurred in 84.5% with telitacicept versus 91.6% with placebo, with infections (mostly upper respiratory) seen in 65.3% and 60.1%, respectively.
 

Sjögren’s trial

The second trial was a phase 2, randomized, placebo-controlled, 24-week study in 42 patients with pSS. Patients (18-65 years) received telitacicept at 160 mg or 240 mg subcutaneously once a week, or placebo, for a total of 24 doses. Patients had a EULAR Sjögren’s Syndrome Disease Activity Index (ESSDAI) score of 5 points or more, and were anti-SSA antibody positive.

“Compared with placebo, telitacicept treatment resulted in significant improvement in ESSDAI and MFI-20 [20-item Multidimensional Fatigue Inventory],” Dr. van Vollenhoven reported, adding that, “there was a trend for improvement in salivary gland function and lacrimal gland function relative to placebo, as well as a favorable safety profile.”

ESSDAI change from baseline was 0.5, –3.8, and –2.3 in placebo, 160-mg, and 240-mg telitacicept doses, respectively. MFI-20 change from baseline was 7.0, –4.0, and –5.1, respectively. Dr. Van Vollenhoven said the difference between the doses was not statistically significant.

“If these results are confirmed, it could be the first time a biologic is proven efficacious in this disease,” Dr. Van Vollenhoven said in an interview. “It’s encouraging to know that a new treatment is showing promise in this phase 2 trial. A phase 3 trial is warranted.”
 

Studies yield promising but confusing results

In an interview, Roy Fleischmann, MD, who was not involved with either study, wondered whether the results of the SLE study could be race specific given the magnitude of response to the drug and that the trial was conducted only in China, and whether the positive results of the small Sjögren’s study will pan out in a larger trial.

“The SLE study was very interesting, but the problem is that it’s a Chinese drug in Chinese patients with Chinese doctors, so they are very dramatic results,” he said, questioning whether “these results are race specific,” and that “we will find out when they do the multinational study, but we haven’t seen this type of separation before [in response]. It’s interesting.

“The Sjögren’s was a positive study, but it was confusing because the low dose seemed to be better than the higher dose, and there were very few patients,” said Dr. Fleischmann, clinical professor of medicine at the University of Texas Southwestern Medical Center and codirector of the Metroplex Clinical Research Center, both in Dallas. The left and right eyes gave different results, which was strange, and the salivary gland test was the same [mixed results], so what can we conclude? All in all, it was a small study with a suggestion of efficacy, but we have to do the phase 3 and see what it shows.”

Both trials were sponsored by RemeGen. Dr. van Vollenhoven reported serving as a paid adviser to AbbVie, AstraZeneca, Biogen, Bristol-Myers Squibb, Galapagos, GlaxoSmithKline, Janssen, Pfizer, RemeGen, and UCB. He has received research funding from Bristol-Myers Squibb and UCB and educational support from AstraZeneca, Galapagos, Merck Sharp & Dohme, Novartis, Pfizer, Roche, Sanofi, and UCB. Dr. Fleischmann said he had has no relevant financial relationships.

MILAN – Results of a phase 3 trial with the investigational drug telitacicept show that patients with systemic lupus erythematosus have a significantly greater rate of response to SLE response criteria, compared with placebo, while results from a phase 2 trial of the drug in patients with primary Sjögren’s syndrome (pSS) also show significant improvements versus placebo.

“With only a limited number of treatments available for patients with lupus, this additional option is certainly an advance and the trial shows a strong efficacy result,” said Ronald van Vollenhoven, MD, PhD, who was not an investigator for either trial but presented the results for both at the annual European Congress of Rheumatology. He is professor of clinical immunology and rheumatology at Amsterdam University Medical Center and VU University Medical Center, also in Amsterdam.

Becky McCall/MDedge News

Telitacicept is a recombinant fusion protein that targets B-lymphocyte stimulator and a proliferating-inducing ligand. It is currently undergoing testing in another phase 3 trial (REMESLE-1) at sites in the United States, Europe, and Asia. The current SLE results relate to the phase 3 study conducted in China, Dr. van Vollenhoven clarified.
 

SLE trial

The double-blind, placebo-controlled trial included 335 patients with SLE who had an average age of 35 years, a body mass index of 22-23 kg/m², and a mean SELENA-SLEDAI (Safety of Estrogens in Systemic Lupus Erythematosus National Assessment–Systemic Lupus Erythematosus Disease Activity Index) score of at least 11.5, indicating high disease activity. Most patients were on glucocorticoids and immunosuppressants.

Patients were randomized 1:1 to weekly subcutaneous injections of telitacicept (160 mg; n = 167) or placebo (n = 168) in combination with standard therapy for 52 weeks. The primary endpoint was the SLE Responder Index-4 (SRI4) response rate at week 52, while key secondary endpoints included SELENA-SLEDAI, physician global assessment, and levels of immunologic biomarkers including C3, C4, IgM, IgG, IgA, and CD19+ B cells. Safety was also assessed.

At week 52, Dr. van Vollenhoven reported that significantly more patients taking telitacicept achieved a SRI4 response, compared with placebo, at 67.1% versus 32.7%, respectively (P < .001). “The difference was seen at 4-8 weeks and stabilized at around 20 weeks,” he said.

Time to first SLE flare was also reduced in patients on the trial drug at a median of 198 days (95% confidence interval, 169-254 days), compared with placebo at 115 days (95% CI, 92-140 days).

“The secondary outcomes also supported efficacy in these patients,” Dr. van Vollenhoven added, noting that there was a rapid and sustained increase of C3 and C4, the latter being significantly greater than placebo, and reduction of IgM, IgG, IgA, and CD19+ B cells observed following telitacicept treatment.

A significantly higher proportion of patients in the telitacicept group showed improvement in SELENA-SLEDAI at week 52, defined as a 4-point or greater reduction, compared with placebo (70.1% vs. 40.5%).

Telitacicept did not increase the risk of infections. Treatment-emergent adverse events occurred in 84.5% with telitacicept versus 91.6% with placebo, with infections (mostly upper respiratory) seen in 65.3% and 60.1%, respectively.
 

Sjögren’s trial

The second trial was a phase 2, randomized, placebo-controlled, 24-week study in 42 patients with pSS. Patients (18-65 years) received telitacicept at 160 mg or 240 mg subcutaneously once a week, or placebo, for a total of 24 doses. Patients had a EULAR Sjögren’s Syndrome Disease Activity Index (ESSDAI) score of 5 points or more, and were anti-SSA antibody positive.

“Compared with placebo, telitacicept treatment resulted in significant improvement in ESSDAI and MFI-20 [20-item Multidimensional Fatigue Inventory],” Dr. van Vollenhoven reported, adding that, “there was a trend for improvement in salivary gland function and lacrimal gland function relative to placebo, as well as a favorable safety profile.”

ESSDAI change from baseline was 0.5, –3.8, and –2.3 in placebo, 160-mg, and 240-mg telitacicept doses, respectively. MFI-20 change from baseline was 7.0, –4.0, and –5.1, respectively. Dr. Van Vollenhoven said the difference between the doses was not statistically significant.

“If these results are confirmed, it could be the first time a biologic is proven efficacious in this disease,” Dr. Van Vollenhoven said in an interview. “It’s encouraging to know that a new treatment is showing promise in this phase 2 trial. A phase 3 trial is warranted.”
 

Studies yield promising but confusing results

In an interview, Roy Fleischmann, MD, who was not involved with either study, wondered whether the results of the SLE study could be race specific given the magnitude of response to the drug and that the trial was conducted only in China, and whether the positive results of the small Sjögren’s study will pan out in a larger trial.

“The SLE study was very interesting, but the problem is that it’s a Chinese drug in Chinese patients with Chinese doctors, so they are very dramatic results,” he said, questioning whether “these results are race specific,” and that “we will find out when they do the multinational study, but we haven’t seen this type of separation before [in response]. It’s interesting.

“The Sjögren’s was a positive study, but it was confusing because the low dose seemed to be better than the higher dose, and there were very few patients,” said Dr. Fleischmann, clinical professor of medicine at the University of Texas Southwestern Medical Center and codirector of the Metroplex Clinical Research Center, both in Dallas. The left and right eyes gave different results, which was strange, and the salivary gland test was the same [mixed results], so what can we conclude? All in all, it was a small study with a suggestion of efficacy, but we have to do the phase 3 and see what it shows.”

Both trials were sponsored by RemeGen. Dr. van Vollenhoven reported serving as a paid adviser to AbbVie, AstraZeneca, Biogen, Bristol-Myers Squibb, Galapagos, GlaxoSmithKline, Janssen, Pfizer, RemeGen, and UCB. He has received research funding from Bristol-Myers Squibb and UCB and educational support from AstraZeneca, Galapagos, Merck Sharp & Dohme, Novartis, Pfizer, Roche, Sanofi, and UCB. Dr. Fleischmann said he had has no relevant financial relationships.

A team of researchers has identified genomic variants that cause disabling pansclerotic morphea (DPM), a rare, severe inflammatory skin disorder, and report that the Janus kinase (JAK) inhibitor ruxolitinib may be a useful therapy, especially in patients who have not responded to other interventions.

DPM was first reported in 1923, and while a genetic cause has been suspected, it had not been identified until now. The disease is the most severe form of deep morphea, which affects individuals with juvenile localized scleroderma. Patients, generally children under age 14, experience rapid sclerosis of all layers of the skin, fascia, muscle, and bone. DPM is also deadly: Most patients do not live more than 10 years after diagnosis, as they contract squamous cell carcinoma, restrictive pulmonary disease, sepsis, and gangrene.

In the study, published in the New England Journal of Medicine, the researchers discovered that people with DPM have an overactive version of the protein STAT4, which regulates inflammation and wound healing. The scientists studied four patients from three unrelated families with an autosomal dominant pattern of inheritance of DPM.

“Researchers previously thought that this disorder was caused by the immune system attacking the skin,” Sarah Blackstone, a predoctoral fellow in the inflammatory disease section at the National Human Genome Research Institute and co–first author of the study, said in a statement from the National Institutes of Health describing the results. “However, we found that this is an oversimplification, and that both skin and the immune system play an active role in disabling pansclerotic morphea,” added Ms. Blackstone, also a medical student at the University of South Dakota, Sioux Falls.

The overactive STAT4 protein creates a positive feedback loop of inflammation and impaired wound-healing. By targeting JAK, the researchers were able to stop the feedback and patients’ wounds dramatically improved. After 18 months of treatment with oral ruxolitinib, one patient had discontinued all other medications, and had complete resolution of a chest rash, substantial clearing on the arms and legs, and global clinical improvement.

The authors said that oral systemic JAK inhibitor therapy is preferred over topical therapy. Their research also suggested that anti–interleukin-6 monoclonal antibodies – such as tocilizumab, approved for indications that include rheumatoid arthritis and systemic sclerosis–associated interstitial lung disease, “may be an alternative therapy or may be useful in combination with JAK inhibitors in patients with DPM,” the authors wrote.

Most current DPM therapies – including methotrexate, mycophenolate mofetil, and ultraviolet A light therapy – have been ineffective, and some have severe side effects.

“The findings of this study open doors for JAK inhibitors to be a potential treatment for other inflammatory skin disorders or disorders related to tissue scarring, whether it is scarring of the lungs, liver or bone marrow,” Dan Kastner, MD, PhD, an NIH distinguished investigator, head of the NHGRI’s inflammatory disease section, and a senior author of the paper, said in the NIH statement.

“We hope to continue studying other molecules in this pathway and how they are altered in patients with disabling pansclerotic morphea and related conditions to find clues to understanding a broader array of more common diseases,” Lori Broderick, MD, PhD, a senior author of the paper and an associate professor at University of California, San Diego, said in the statement.

The study was led by researchers at NHGRI in collaboration with researchers from UCSD and the University of Pittsburgh. Researchers from the National Institute of Arthritis and Musculoskeletal and Skin Diseases and the National Institute of Allergy and Infectious Diseases also participated.

The study was supported by grants from the American Academy of Allergy, Asthma, and Immunology Foundation; the Ludwig Institute for Cancer Research; the University of California, San Diego, department of pediatrics; and the Novo Nordisk Foundation. Additional support and grants were given by the Deutsche Forschungsgemeinschaft, various institutes at the NIH, the California Institute for Regenerative Medicine, the Hydrocephalus Association, the Scleroderma Research Foundation, the Biowulf High-Performance Computing Cluster of the Center for Information Technology, the Undiagnosed Diseases Program of the Common Fund of the Office of the Director of the NIH, and the NIH Clinical Center.

A team of researchers has identified genomic variants that cause disabling pansclerotic morphea (DPM), a rare, severe inflammatory skin disorder, and report that the Janus kinase (JAK) inhibitor ruxolitinib may be a useful therapy, especially in patients who have not responded to other interventions.

DPM was first reported in 1923, and while a genetic cause has been suspected, it had not been identified until now. The disease is the most severe form of deep morphea, which affects individuals with juvenile localized scleroderma. Patients, generally children under age 14, experience rapid sclerosis of all layers of the skin, fascia, muscle, and bone. DPM is also deadly: Most patients do not live more than 10 years after diagnosis, as they contract squamous cell carcinoma, restrictive pulmonary disease, sepsis, and gangrene.

In the study, published in the New England Journal of Medicine, the researchers discovered that people with DPM have an overactive version of the protein STAT4, which regulates inflammation and wound healing. The scientists studied four patients from three unrelated families with an autosomal dominant pattern of inheritance of DPM.

“Researchers previously thought that this disorder was caused by the immune system attacking the skin,” Sarah Blackstone, a predoctoral fellow in the inflammatory disease section at the National Human Genome Research Institute and co–first author of the study, said in a statement from the National Institutes of Health describing the results. “However, we found that this is an oversimplification, and that both skin and the immune system play an active role in disabling pansclerotic morphea,” added Ms. Blackstone, also a medical student at the University of South Dakota, Sioux Falls.

The overactive STAT4 protein creates a positive feedback loop of inflammation and impaired wound-healing. By targeting JAK, the researchers were able to stop the feedback and patients’ wounds dramatically improved. After 18 months of treatment with oral ruxolitinib, one patient had discontinued all other medications, and had complete resolution of a chest rash, substantial clearing on the arms and legs, and global clinical improvement.

The authors said that oral systemic JAK inhibitor therapy is preferred over topical therapy. Their research also suggested that anti–interleukin-6 monoclonal antibodies – such as tocilizumab, approved for indications that include rheumatoid arthritis and systemic sclerosis–associated interstitial lung disease, “may be an alternative therapy or may be useful in combination with JAK inhibitors in patients with DPM,” the authors wrote.

Most current DPM therapies – including methotrexate, mycophenolate mofetil, and ultraviolet A light therapy – have been ineffective, and some have severe side effects.

“The findings of this study open doors for JAK inhibitors to be a potential treatment for other inflammatory skin disorders or disorders related to tissue scarring, whether it is scarring of the lungs, liver or bone marrow,” Dan Kastner, MD, PhD, an NIH distinguished investigator, head of the NHGRI’s inflammatory disease section, and a senior author of the paper, said in the NIH statement.

“We hope to continue studying other molecules in this pathway and how they are altered in patients with disabling pansclerotic morphea and related conditions to find clues to understanding a broader array of more common diseases,” Lori Broderick, MD, PhD, a senior author of the paper and an associate professor at University of California, San Diego, said in the statement.

The study was led by researchers at NHGRI in collaboration with researchers from UCSD and the University of Pittsburgh. Researchers from the National Institute of Arthritis and Musculoskeletal and Skin Diseases and the National Institute of Allergy and Infectious Diseases also participated.

The study was supported by grants from the American Academy of Allergy, Asthma, and Immunology Foundation; the Ludwig Institute for Cancer Research; the University of California, San Diego, department of pediatrics; and the Novo Nordisk Foundation. Additional support and grants were given by the Deutsche Forschungsgemeinschaft, various institutes at the NIH, the California Institute for Regenerative Medicine, the Hydrocephalus Association, the Scleroderma Research Foundation, the Biowulf High-Performance Computing Cluster of the Center for Information Technology, the Undiagnosed Diseases Program of the Common Fund of the Office of the Director of the NIH, and the NIH Clinical Center.

A team of researchers has identified genomic variants that cause disabling pansclerotic morphea (DPM), a rare, severe inflammatory skin disorder, and report that the Janus kinase (JAK) inhibitor ruxolitinib may be a useful therapy, especially in patients who have not responded to other interventions.

DPM was first reported in 1923, and while a genetic cause has been suspected, it had not been identified until now. The disease is the most severe form of deep morphea, which affects individuals with juvenile localized scleroderma. Patients, generally children under age 14, experience rapid sclerosis of all layers of the skin, fascia, muscle, and bone. DPM is also deadly: Most patients do not live more than 10 years after diagnosis, as they contract squamous cell carcinoma, restrictive pulmonary disease, sepsis, and gangrene.

In the study, published in the New England Journal of Medicine, the researchers discovered that people with DPM have an overactive version of the protein STAT4, which regulates inflammation and wound healing. The scientists studied four patients from three unrelated families with an autosomal dominant pattern of inheritance of DPM.

“Researchers previously thought that this disorder was caused by the immune system attacking the skin,” Sarah Blackstone, a predoctoral fellow in the inflammatory disease section at the National Human Genome Research Institute and co–first author of the study, said in a statement from the National Institutes of Health describing the results. “However, we found that this is an oversimplification, and that both skin and the immune system play an active role in disabling pansclerotic morphea,” added Ms. Blackstone, also a medical student at the University of South Dakota, Sioux Falls.

The overactive STAT4 protein creates a positive feedback loop of inflammation and impaired wound-healing. By targeting JAK, the researchers were able to stop the feedback and patients’ wounds dramatically improved. After 18 months of treatment with oral ruxolitinib, one patient had discontinued all other medications, and had complete resolution of a chest rash, substantial clearing on the arms and legs, and global clinical improvement.

The authors said that oral systemic JAK inhibitor therapy is preferred over topical therapy. Their research also suggested that anti–interleukin-6 monoclonal antibodies – such as tocilizumab, approved for indications that include rheumatoid arthritis and systemic sclerosis–associated interstitial lung disease, “may be an alternative therapy or may be useful in combination with JAK inhibitors in patients with DPM,” the authors wrote.

Most current DPM therapies – including methotrexate, mycophenolate mofetil, and ultraviolet A light therapy – have been ineffective, and some have severe side effects.

“The findings of this study open doors for JAK inhibitors to be a potential treatment for other inflammatory skin disorders or disorders related to tissue scarring, whether it is scarring of the lungs, liver or bone marrow,” Dan Kastner, MD, PhD, an NIH distinguished investigator, head of the NHGRI’s inflammatory disease section, and a senior author of the paper, said in the NIH statement.

“We hope to continue studying other molecules in this pathway and how they are altered in patients with disabling pansclerotic morphea and related conditions to find clues to understanding a broader array of more common diseases,” Lori Broderick, MD, PhD, a senior author of the paper and an associate professor at University of California, San Diego, said in the statement.

The study was led by researchers at NHGRI in collaboration with researchers from UCSD and the University of Pittsburgh. Researchers from the National Institute of Arthritis and Musculoskeletal and Skin Diseases and the National Institute of Allergy and Infectious Diseases also participated.

The study was supported by grants from the American Academy of Allergy, Asthma, and Immunology Foundation; the Ludwig Institute for Cancer Research; the University of California, San Diego, department of pediatrics; and the Novo Nordisk Foundation. Additional support and grants were given by the Deutsche Forschungsgemeinschaft, various institutes at the NIH, the California Institute for Regenerative Medicine, the Hydrocephalus Association, the Scleroderma Research Foundation, the Biowulf High-Performance Computing Cluster of the Center for Information Technology, the Undiagnosed Diseases Program of the Common Fund of the Office of the Director of the NIH, and the NIH Clinical Center.

Around 5% of patients treated with dupilumab (Dupixent) for moderate-to-severe atopic dermatitis experience musculoskeletal (MSK) symptoms, according to the results of a descriptive study.

The main MSK symptom seen in the observational cohort was enthesitis, but some patients also experienced arthritis and tenosynovitis a median of 17 weeks after starting dupilumab treatment. Together these symptoms represent a new MSK syndrome, say researchers from the United Kingdom.

“The pattern of MSK symptoms and signs is characteristic of psoriatic arthritis/peripheral spondyloarthritis,” Bruce Kirkham, MD, and collaborators report in Arthritis & Rheumatology.

“We started a few years ago and have been following the patients for quite a long time,” Dr. Kirkham, a consultant rheumatologist at Guy’s and St. Thomas’ NHS Foundation Trust, London, told this news organization.

Characterizing the MSK symptoms

Of 470 patients with atopic dermatitis who started treatment with dupilumab at Guy’s and St. Thomas’ NHS Foundation Trust between October 2018 and February 2021, 36 (7.65%) developed rheumatic symptoms and were referred to the rheumatology department. These individuals had their family history assessed and thorough MSK evaluations, which included antibody and inflammatory markers, ultrasound of the peripheral small joints, and MRI of the large joints and spine.

A total of 26 (5.5%) patients – 14 of whom were male – had inflammatory enthesitis, arthritis, and/or tenosynovitis. Of the others, seven had osteoarthritis and three had degenerative spine disease.

Enthesitis was the most common finding in those with rheumatic symptoms, occurring on its own in 11 patients, with arthritis in three patients, and tenosynovitis in two patients.  

These symptoms appeared 2-48 weeks after starting dupilumab treatment and were categorized as mild in 16 (61%) cases, moderate in six cases, and severe in four cases.

No specific predictors of the MSK symptoms seen were noted. Patient age, sex, duration of their atopic dermatitis, or how their skin condition had been previously treated did not help identify those who might develop rheumatic problems.
 

Conservative management approach

All patients had “outstanding” responses to treatment, Dr. Kirkham noted: The mean Eczema Area and Severity Index score before dupilumab treatment was 21, falling to 4.2 with treatment, indicating a mean 80% improvement.

Co-author Joseph Nathan, MBChB, of London North West Healthcare NHS Trust, who collaborated on the research while working within Dr. Kirkham’s group, said separately: “The concern that patients have is that when they start a medication and develop a side effect is that the medication is going to be stopped.”

Clinicians treating the patients took a conservative approach, prescribing NSAIDs such as cyclooxygenase-2 inhibitors or altering the frequency with which dupilumab was given.

With this approach, MSK symptoms resolved in 15 patients who remained on treatment and in seven who had to stop dupilumab. There were four patients, however, who had unresolved symptoms even once dupilumab treatment had been stopped.
 

Altering the local cytokine balance

Dupilumab is a monoclonal antibody that binds to the alpha subunit of the interleukin-4 receptor. This results in blocking the function of not only IL-4 but also IL-13.

Dr. Kirkham and colleagues think this might not only alter the balance of cytokines in the skin but also in the joints and entheses with IL-17, IL-23, or even tumor necrosis factor playing a possible role. Another thought is that many circulating T-cells in the skin move to the joints and entheses to trigger symptoms.

IL-13 inhibition does seem to be important, as another British research team, from the Centre for Epidemiology Versus Arthritis at the University of Manchester (England), has found.

At the recent annual meeting of the British Society for Rheumatology, Sizheng Steven Zhao, MBChB, PhD, and colleagues reported that among people who carried a genetic variant predisposing them to having low IL-13 function, there was a higher risk for inflammatory diseases such as psoriatic arthritis and other spondyloarthropathy-related diseases.

Sara Freeman/Frontline Medical News

Dermatology perspective

Approved by the U.S. Food and Drug Administration in 2017, dupilumab has since been hailed as a “breakthrough” in atopic dermatitis treatment. Given as a subcutaneous injection every 2 weeks, it provides a much-needed option for people who have moderate-to-severe disease and have tried other available treatments, including corticosteroids.

Dupilumab has since also been approved for asthma, chronic sinusitis with nasal polyposis, eosinophilic esophagitis, and prurigo nodularis and is used off-label for other skin conditions such as contact dermatitis, chronic spontaneous urticaria, and alopecia areata.

“Dupilumab, like a lot of medications for atopic dermatitis, is a relatively new drug, and we are still learning about its safety,” Joel M. Gelfand, MD, MSCE, of the University of Pennsylvania Perelman School of Medicine, Philadelphia, told this news organization.

“Inflammatory arthritis has been reported in patients treated with dupilumab, and this new study provides some useful estimates,” added Dr. Gelfand, who is a professor of dermatology and epidemiology and directs the Psoriasis and Phototherapy Treatment Center, Philadelphia.

“There was no control group,” Dr. Gelfand said, so “a causal relationship cannot be well established based on these data alone. The mechanism is not known but may result from a shifting of the immune system.”

Dr. Zhao observed: “We don’t know what the natural history of these adverse events is. We don’t know if stopping the drug early will prevent long-term adverse events. So, we don’t know if people will ultimately develop permanent psoriatic arthritis if we don’t intervene quick enough when we observe an adverse event.”

Being aware of the possibility of rheumatic side effects occurring with dupilumab and similar agents is key, Dr. Gelfand and Dr. Kirkham both said independently.

“I have personally seen this entity in my practice,” Dr. Gelfand said. “It is important to clinicians prescribing dupilumab to alert patients about this potential side effect and ask about joint symptoms in follow-up.”

Dr. Kirkham said: “Prescribers need to be aware of it, because up until now it’s been just very vaguely discussed as sort of aches and pains, arthralgias, and it’s a much more specific of a kind of syndrome of enthesitis, arthritis, tenosynovitis – a little like psoriatic arthritis.”

Not everyone has come across these side effects, however, as Steven Daveluy, MD, associate professor and dermatology program director at Wayne State University, Detroit, said in an interview.

“This article and the other case series both noted the musculoskeletal symptoms occurred in about 5% of patients, which surprised me since I haven’t seen it in my practice and have enough patients being treated with dupilumab that I would expect to see a case at that rate,” Dr. Daveluy said.

“The majority of cases are mild and respond to treatment with anti-inflammatories like naproxen, which is available over the counter. It’s likely that patients with a mild case could simply treat their pain with naproxen that’s already in their medicine cabinet until it resolves, never bringing it to the doctor’s attention,” he suggested.

“Dupilumab is still a safe and effective medication that can change the lives of patients suffering from atopic dermatitis,” he said.

“Awareness of this potential side effect can help dermatologists recognize it early and work together with patients to determine the best course of action.”

All research mentioned in this article was independently supported. Dr. Kirkham, Mr. Nathan, Dr. Zhao, and Dr. Daveluy report no relevant financial relationships. Dr. Gelfand has served as a consultant for numerous pharmaceutical companies and receives research grants from Amgen, Boehringer Ingelheim, and Pfizer. He is a co-patent holder of resiquimod for treatment of cutaneous T-cell lymphoma.

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

Around 5% of patients treated with dupilumab (Dupixent) for moderate-to-severe atopic dermatitis experience musculoskeletal (MSK) symptoms, according to the results of a descriptive study.

The main MSK symptom seen in the observational cohort was enthesitis, but some patients also experienced arthritis and tenosynovitis a median of 17 weeks after starting dupilumab treatment. Together these symptoms represent a new MSK syndrome, say researchers from the United Kingdom.

“The pattern of MSK symptoms and signs is characteristic of psoriatic arthritis/peripheral spondyloarthritis,” Bruce Kirkham, MD, and collaborators report in Arthritis & Rheumatology.

“We started a few years ago and have been following the patients for quite a long time,” Dr. Kirkham, a consultant rheumatologist at Guy’s and St. Thomas’ NHS Foundation Trust, London, told this news organization.

Characterizing the MSK symptoms

Of 470 patients with atopic dermatitis who started treatment with dupilumab at Guy’s and St. Thomas’ NHS Foundation Trust between October 2018 and February 2021, 36 (7.65%) developed rheumatic symptoms and were referred to the rheumatology department. These individuals had their family history assessed and thorough MSK evaluations, which included antibody and inflammatory markers, ultrasound of the peripheral small joints, and MRI of the large joints and spine.

A total of 26 (5.5%) patients – 14 of whom were male – had inflammatory enthesitis, arthritis, and/or tenosynovitis. Of the others, seven had osteoarthritis and three had degenerative spine disease.

Enthesitis was the most common finding in those with rheumatic symptoms, occurring on its own in 11 patients, with arthritis in three patients, and tenosynovitis in two patients.  

These symptoms appeared 2-48 weeks after starting dupilumab treatment and were categorized as mild in 16 (61%) cases, moderate in six cases, and severe in four cases.

No specific predictors of the MSK symptoms seen were noted. Patient age, sex, duration of their atopic dermatitis, or how their skin condition had been previously treated did not help identify those who might develop rheumatic problems.
 

Conservative management approach

All patients had “outstanding” responses to treatment, Dr. Kirkham noted: The mean Eczema Area and Severity Index score before dupilumab treatment was 21, falling to 4.2 with treatment, indicating a mean 80% improvement.

Co-author Joseph Nathan, MBChB, of London North West Healthcare NHS Trust, who collaborated on the research while working within Dr. Kirkham’s group, said separately: “The concern that patients have is that when they start a medication and develop a side effect is that the medication is going to be stopped.”

Clinicians treating the patients took a conservative approach, prescribing NSAIDs such as cyclooxygenase-2 inhibitors or altering the frequency with which dupilumab was given.

With this approach, MSK symptoms resolved in 15 patients who remained on treatment and in seven who had to stop dupilumab. There were four patients, however, who had unresolved symptoms even once dupilumab treatment had been stopped.
 

Altering the local cytokine balance

Dupilumab is a monoclonal antibody that binds to the alpha subunit of the interleukin-4 receptor. This results in blocking the function of not only IL-4 but also IL-13.

Dr. Kirkham and colleagues think this might not only alter the balance of cytokines in the skin but also in the joints and entheses with IL-17, IL-23, or even tumor necrosis factor playing a possible role. Another thought is that many circulating T-cells in the skin move to the joints and entheses to trigger symptoms.

IL-13 inhibition does seem to be important, as another British research team, from the Centre for Epidemiology Versus Arthritis at the University of Manchester (England), has found.

At the recent annual meeting of the British Society for Rheumatology, Sizheng Steven Zhao, MBChB, PhD, and colleagues reported that among people who carried a genetic variant predisposing them to having low IL-13 function, there was a higher risk for inflammatory diseases such as psoriatic arthritis and other spondyloarthropathy-related diseases.

Sara Freeman/Frontline Medical News

Dermatology perspective

Approved by the U.S. Food and Drug Administration in 2017, dupilumab has since been hailed as a “breakthrough” in atopic dermatitis treatment. Given as a subcutaneous injection every 2 weeks, it provides a much-needed option for people who have moderate-to-severe disease and have tried other available treatments, including corticosteroids.

Dupilumab has since also been approved for asthma, chronic sinusitis with nasal polyposis, eosinophilic esophagitis, and prurigo nodularis and is used off-label for other skin conditions such as contact dermatitis, chronic spontaneous urticaria, and alopecia areata.

“Dupilumab, like a lot of medications for atopic dermatitis, is a relatively new drug, and we are still learning about its safety,” Joel M. Gelfand, MD, MSCE, of the University of Pennsylvania Perelman School of Medicine, Philadelphia, told this news organization.

“Inflammatory arthritis has been reported in patients treated with dupilumab, and this new study provides some useful estimates,” added Dr. Gelfand, who is a professor of dermatology and epidemiology and directs the Psoriasis and Phototherapy Treatment Center, Philadelphia.

“There was no control group,” Dr. Gelfand said, so “a causal relationship cannot be well established based on these data alone. The mechanism is not known but may result from a shifting of the immune system.”

Dr. Zhao observed: “We don’t know what the natural history of these adverse events is. We don’t know if stopping the drug early will prevent long-term adverse events. So, we don’t know if people will ultimately develop permanent psoriatic arthritis if we don’t intervene quick enough when we observe an adverse event.”

Being aware of the possibility of rheumatic side effects occurring with dupilumab and similar agents is key, Dr. Gelfand and Dr. Kirkham both said independently.

“I have personally seen this entity in my practice,” Dr. Gelfand said. “It is important to clinicians prescribing dupilumab to alert patients about this potential side effect and ask about joint symptoms in follow-up.”

Dr. Kirkham said: “Prescribers need to be aware of it, because up until now it’s been just very vaguely discussed as sort of aches and pains, arthralgias, and it’s a much more specific of a kind of syndrome of enthesitis, arthritis, tenosynovitis – a little like psoriatic arthritis.”

Not everyone has come across these side effects, however, as Steven Daveluy, MD, associate professor and dermatology program director at Wayne State University, Detroit, said in an interview.

“This article and the other case series both noted the musculoskeletal symptoms occurred in about 5% of patients, which surprised me since I haven’t seen it in my practice and have enough patients being treated with dupilumab that I would expect to see a case at that rate,” Dr. Daveluy said.

“The majority of cases are mild and respond to treatment with anti-inflammatories like naproxen, which is available over the counter. It’s likely that patients with a mild case could simply treat their pain with naproxen that’s already in their medicine cabinet until it resolves, never bringing it to the doctor’s attention,” he suggested.

“Dupilumab is still a safe and effective medication that can change the lives of patients suffering from atopic dermatitis,” he said.

“Awareness of this potential side effect can help dermatologists recognize it early and work together with patients to determine the best course of action.”

All research mentioned in this article was independently supported. Dr. Kirkham, Mr. Nathan, Dr. Zhao, and Dr. Daveluy report no relevant financial relationships. Dr. Gelfand has served as a consultant for numerous pharmaceutical companies and receives research grants from Amgen, Boehringer Ingelheim, and Pfizer. He is a co-patent holder of resiquimod for treatment of cutaneous T-cell lymphoma.

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

Around 5% of patients treated with dupilumab (Dupixent) for moderate-to-severe atopic dermatitis experience musculoskeletal (MSK) symptoms, according to the results of a descriptive study.

The main MSK symptom seen in the observational cohort was enthesitis, but some patients also experienced arthritis and tenosynovitis a median of 17 weeks after starting dupilumab treatment. Together these symptoms represent a new MSK syndrome, say researchers from the United Kingdom.

“The pattern of MSK symptoms and signs is characteristic of psoriatic arthritis/peripheral spondyloarthritis,” Bruce Kirkham, MD, and collaborators report in Arthritis & Rheumatology.

“We started a few years ago and have been following the patients for quite a long time,” Dr. Kirkham, a consultant rheumatologist at Guy’s and St. Thomas’ NHS Foundation Trust, London, told this news organization.

Characterizing the MSK symptoms

Of 470 patients with atopic dermatitis who started treatment with dupilumab at Guy’s and St. Thomas’ NHS Foundation Trust between October 2018 and February 2021, 36 (7.65%) developed rheumatic symptoms and were referred to the rheumatology department. These individuals had their family history assessed and thorough MSK evaluations, which included antibody and inflammatory markers, ultrasound of the peripheral small joints, and MRI of the large joints and spine.

A total of 26 (5.5%) patients – 14 of whom were male – had inflammatory enthesitis, arthritis, and/or tenosynovitis. Of the others, seven had osteoarthritis and three had degenerative spine disease.

Enthesitis was the most common finding in those with rheumatic symptoms, occurring on its own in 11 patients, with arthritis in three patients, and tenosynovitis in two patients.  

These symptoms appeared 2-48 weeks after starting dupilumab treatment and were categorized as mild in 16 (61%) cases, moderate in six cases, and severe in four cases.

No specific predictors of the MSK symptoms seen were noted. Patient age, sex, duration of their atopic dermatitis, or how their skin condition had been previously treated did not help identify those who might develop rheumatic problems.
 

Conservative management approach

All patients had “outstanding” responses to treatment, Dr. Kirkham noted: The mean Eczema Area and Severity Index score before dupilumab treatment was 21, falling to 4.2 with treatment, indicating a mean 80% improvement.

Co-author Joseph Nathan, MBChB, of London North West Healthcare NHS Trust, who collaborated on the research while working within Dr. Kirkham’s group, said separately: “The concern that patients have is that when they start a medication and develop a side effect is that the medication is going to be stopped.”

Clinicians treating the patients took a conservative approach, prescribing NSAIDs such as cyclooxygenase-2 inhibitors or altering the frequency with which dupilumab was given.

With this approach, MSK symptoms resolved in 15 patients who remained on treatment and in seven who had to stop dupilumab. There were four patients, however, who had unresolved symptoms even once dupilumab treatment had been stopped.
 

Altering the local cytokine balance

Dupilumab is a monoclonal antibody that binds to the alpha subunit of the interleukin-4 receptor. This results in blocking the function of not only IL-4 but also IL-13.

Dr. Kirkham and colleagues think this might not only alter the balance of cytokines in the skin but also in the joints and entheses with IL-17, IL-23, or even tumor necrosis factor playing a possible role. Another thought is that many circulating T-cells in the skin move to the joints and entheses to trigger symptoms.

IL-13 inhibition does seem to be important, as another British research team, from the Centre for Epidemiology Versus Arthritis at the University of Manchester (England), has found.

At the recent annual meeting of the British Society for Rheumatology, Sizheng Steven Zhao, MBChB, PhD, and colleagues reported that among people who carried a genetic variant predisposing them to having low IL-13 function, there was a higher risk for inflammatory diseases such as psoriatic arthritis and other spondyloarthropathy-related diseases.

Sara Freeman/Frontline Medical News

Dermatology perspective

Approved by the U.S. Food and Drug Administration in 2017, dupilumab has since been hailed as a “breakthrough” in atopic dermatitis treatment. Given as a subcutaneous injection every 2 weeks, it provides a much-needed option for people who have moderate-to-severe disease and have tried other available treatments, including corticosteroids.

Dupilumab has since also been approved for asthma, chronic sinusitis with nasal polyposis, eosinophilic esophagitis, and prurigo nodularis and is used off-label for other skin conditions such as contact dermatitis, chronic spontaneous urticaria, and alopecia areata.

“Dupilumab, like a lot of medications for atopic dermatitis, is a relatively new drug, and we are still learning about its safety,” Joel M. Gelfand, MD, MSCE, of the University of Pennsylvania Perelman School of Medicine, Philadelphia, told this news organization.

“Inflammatory arthritis has been reported in patients treated with dupilumab, and this new study provides some useful estimates,” added Dr. Gelfand, who is a professor of dermatology and epidemiology and directs the Psoriasis and Phototherapy Treatment Center, Philadelphia.

“There was no control group,” Dr. Gelfand said, so “a causal relationship cannot be well established based on these data alone. The mechanism is not known but may result from a shifting of the immune system.”

Dr. Zhao observed: “We don’t know what the natural history of these adverse events is. We don’t know if stopping the drug early will prevent long-term adverse events. So, we don’t know if people will ultimately develop permanent psoriatic arthritis if we don’t intervene quick enough when we observe an adverse event.”

Being aware of the possibility of rheumatic side effects occurring with dupilumab and similar agents is key, Dr. Gelfand and Dr. Kirkham both said independently.

“I have personally seen this entity in my practice,” Dr. Gelfand said. “It is important to clinicians prescribing dupilumab to alert patients about this potential side effect and ask about joint symptoms in follow-up.”

Dr. Kirkham said: “Prescribers need to be aware of it, because up until now it’s been just very vaguely discussed as sort of aches and pains, arthralgias, and it’s a much more specific of a kind of syndrome of enthesitis, arthritis, tenosynovitis – a little like psoriatic arthritis.”

Not everyone has come across these side effects, however, as Steven Daveluy, MD, associate professor and dermatology program director at Wayne State University, Detroit, said in an interview.

“This article and the other case series both noted the musculoskeletal symptoms occurred in about 5% of patients, which surprised me since I haven’t seen it in my practice and have enough patients being treated with dupilumab that I would expect to see a case at that rate,” Dr. Daveluy said.

“The majority of cases are mild and respond to treatment with anti-inflammatories like naproxen, which is available over the counter. It’s likely that patients with a mild case could simply treat their pain with naproxen that’s already in their medicine cabinet until it resolves, never bringing it to the doctor’s attention,” he suggested.

“Dupilumab is still a safe and effective medication that can change the lives of patients suffering from atopic dermatitis,” he said.

“Awareness of this potential side effect can help dermatologists recognize it early and work together with patients to determine the best course of action.”

All research mentioned in this article was independently supported. Dr. Kirkham, Mr. Nathan, Dr. Zhao, and Dr. Daveluy report no relevant financial relationships. Dr. Gelfand has served as a consultant for numerous pharmaceutical companies and receives research grants from Amgen, Boehringer Ingelheim, and Pfizer. He is a co-patent holder of resiquimod for treatment of cutaneous T-cell lymphoma.

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

Scabies is caused by cutaneous ectoparasitic infection by the mite Sarcoptes scabiei var hominis. The infection is highly contagious via direct skin-to-skin contact or indirectly through infested bedding, clothing or fomites.^1,2 Scabies occurs at all ages, in all ethnic groups, and at all socioeconomic levels.¹ Analysis by the Global Burden of Disease estimates that 200 million individuals have been infected with scabies worldwide. The World Health Organization has declared scabies a neglected tropical disease.³

Crusted scabies is a severe and rare form of scabies, with hyperinfestation of thousands to millions of mites, and more commonly is associated with immunosuppressed states, including HIV and hematologic malignancies.^1,2,4 Crusted scabies has a high mortality rate due to sepsis when left untreated.^3,5

Occasionally, iatrogenic immunosuppression contributes to the development of crusted scabies.^1,2 Iatrogenic immunosuppression leading to crusted scabies most commonly occurs secondary to immunosuppression after bone marrow or solid organ transplantation.⁶ Less often, crusted scabies is caused by iatrogenic immunosuppression from other clinical scenarios.^1,2

We describe a patient with iatrogenic immunosuppression due to azathioprine-induced myelosuppression for the treatment of granulomatosis with polyangiitis (GPA) who developed crusted scabies that clinically presented as erythroderma. Crusted scabies should be included in the differential diagnosis of erythroderma, especially in the setting of iatrogenic immunosuppression, for timely and appropriate management.

Case Report

An 84-year-old man presented with worsening pruritus, erythema, and thick yellow scale that progressed to erythroderma over the last 2 weeks. He was diagnosed with GPA 6 months prior to presentation and was treated with azathioprine 150 mg/d, prednisone 10 mg/d, and sulfamethoxazole 800 mg plus trimethoprim 160 mg twice weekly for prophylaxis against Pneumocystis jirovecii pneumonia.

Three weeks prior to presentation, the patient was hospitalized for pancytopenia attributed to azathioprine-induced myelosuppression (hemoglobin, 6.1 g/dL [reference range, 13.5–18.0 g/dL]; hematocrit, 17.5% [reference range, 42%–52%]; white blood cell count, 1.66×10³/μL [reference range, 4.0–10.5×10³/μL]; platelet count, 146×10³/μL [reference range, 150–450×10³/μL]; absolute neutrophil count, 1.29×10³/μL [reference range, 1.4–6.5×10³/μL]). He was transferred to a skilled nursing facility after discharge and referred to dermatology for evaluation of the worsening pruritic rash.

At the current presentation, the patient denied close contact with anyone who had a similar rash at home or at the skilled nursing facility. Physical examination revealed diffuse erythroderma with yellow scale on the scalp, trunk, arms, and legs (Figure 1). The palms showed scattered 2- to 3-mm pustules. The mucosal surfaces did not have lesions. A punch biopsy of a pustule from the right arm revealed focal spongiosis, parakeratosis, and acanthosis, as well as a perivascular and interstitial mixed inflammatory infiltrate with lymphocytes and eosinophils. Organisms morphologically compatible with scabies were found in the stratum corneum (Figure 2). Another punch biopsy of a pustule from the right arm was performed for direct immunofluorescence (DIF) and was negative for immunoglobulin deposition. Mineral oil preparation from pustules on the palm was positive for mites.

The patient was treated with permethrin cream 5% and oral ivermectin 200 μg/kg on day 1 and day 10. The prednisone dosage was increased from 10 mg/d to 50 mg/d and tapered over 2 weeks to treat the symptomatic rash and GPA. He remains on maintenance rituximab for GPA, without recurrence of scabies.

Comment

Pathogenesis—As an obligate parasite, S scabiei spends its entire life cycle within the host. Impregnated female mites burrow into the epidermis after mating and lay eggs daily for 1 to 2 months. Eggs hatch 2 or 3 days later. Larvae then migrate to the skin surface; burrow into the stratum corneum, where they mature into adults; and then mate on the skin surface.^1,4

Clinical Presentation and Sequelae—Typically, scabies presents 2 to 6 weeks after initial exposure with generalized and intense itching and inflammatory pruritic papules on the finger webs, wrists, elbows, axillae, buttocks, umbilicus, genitalia, and areolae.¹ Burrows are specific for scabies but may not always be present. Often, there are nonspecific secondary lesions, including excoriations, dermatitis, and impetiginization.

Complications of scabies can be severe, with initial colonization and infection of the skin resulting in impetigo and cellulitis. Systematic sequelae from local skin infection include post-streptococcal glomerulonephritis, rheumatic fever, and sepsis. Mortality from sepsis in scabies can be high.^3,5

Classic Crusted Scabies and Other Variants—Crusted scabies presents with psoriasiform hyperkeratotic plaques involving the hands and feet with potential nail involvement that can become more generalized.¹ Alterations in CD4⁺ T-cell function have been implicated in the development of crusted scabies, in which an excessive helper T cell (T_H2) response is elicited against the ectoparasite, which may help explain the intense pruritus of scabies.⁶ Occasionally, iatrogenic immunosuppression contributes to development of crusted scabies,¹ as was the case with our patient. However, it is rare for crusted scabies to present with erythroderma.⁷

Other atypical presentations of scabies include a seborrheic dermatitis–like presentation in infants, nodular lesions in the groin and axillae in more chronic scabies, and vesicles or bullous lesions.¹

Diagnosis—Identification of mites, eggs, or feces is necessary for definitive diagnosis of scabies.⁸ These materials can be obtained through skin scrapings with mineral oil and observed under light microscopy or direct dermoscopy. Multiple scrapings on many lesions should be performed because failure to identify mites can be common and does not rule out scabies. Dermoscopic examination of active lesions under low power also can be helpful, given that identification of dark brown triangular structures can correspond to visualization of the pigmented anterior section of the mite.^9-11 A skin biopsy can help identify mites, but histopathology often shows a nonspecific hypersensitivity reaction.¹² Therefore, empiric treatment often is necessary.

Differential Diagnosis—The differential diagnosis of erythroderma is broad and includes a drug eruption; Sézary syndrome; and pre-existing skin diseases, including psoriasis, atopic dermatitis, pityriasis rubra pilaris, pemphigus foliaceus, and bullous pemphigoid. Histopathology is critical to differentiate these diagnoses. Bullous pemphigoid and pemphigus foliaceus are immunobullous diseases that typically are positive for immunoglobulin deposition on DIF. In rare cases, scabies also can present with bullae and positive DIF test results.¹³

Treatment—First-line treatment of crusted scabies in the United States is permethrin cream 5%, followed by oral ivermectin 200 μg/kg.^4,5,14,15 Other scabicides include topicals such as benzyl benzoate 10% to 25%; precipitated sulfur 2% to 10%; crotamiton 10%; malathion 0.5%; and lindane 1%.⁵ The association of neurotoxicity with lindane has considerably reduced the drug’s use.¹

During treatment of scabies, it is important to isolate patients to mitigate the possibility of spread.⁴ Pruritus can persist for a few weeks after completion of therapy.⁵ Patients should be closely monitored to ensure that this symptom is secondary to skin inflammation and not incomplete treatment.

Treatment of crusted scabies may require repeated treatments to decrease the notable mite burden as well as the associated crusting and scale. Adding a keratolytic such as 5% to 10% salicylic acid in petrolatum to the treatment regimen may be useful for breaking up thick scale.⁵

Immunosuppression—With numerous immunomodulatory drugs for treating autoimmunity comes an increased risk for iatrogenic immunosuppression that may contribute to the development of crusted scabies.¹⁶ In a number of autoimmune diseases such as rheumatoid arthritis,^17-19 psoriasis,^20,21 pemphigus vulgaris,²² systemic lupus erythematosus,²³ systemic sclerosis,^22,24 bullous pemphigoid,^25,26 and dermatomyositis,²⁷ patients have developed crusted scabies secondary to treatment-related immunosuppression. These immunosuppressive therapies include systemic steroids,^22-24,26-31 methotrexate,²³ infliximab,¹⁸ adalimumab,²¹ toclizumab,¹⁹ and etanercept.²⁰ In a case of drug-induced Stevens-Johnson syndrome, the patient developed crusted scabies during long-term use of oral steroids.²²

Patients with a malignancy who are being treated with chemotherapy also can develop crusted scabies.²⁸ Crusted scabies has even been associated with long-term topical steroid^32-34 and topical calcineurin inhibitor use.¹⁶

Iatrogenic immunosuppression in our patient resulted from treatment of GPA with azathioprine, an immunosuppressive drug that acts as an antagonist of the breakdown of purines, leading to inhibition of DNA, RNA, and protein synthesis.³⁵ On occasion, azathioprine can induce immunosuppression in the form of myelosuppression and resulting pancytopenia, as was the case with our patient.

Conclusion

Although scabies is designated as a neglected tropical disease by the World Health Organization, it still causes a notable burden worldwide, regardless of the economics. Our case highlights an unusual presentation of scabies as erythroderma in the setting of iatrogenic immunosuppression from azathioprine use. Dermatologists should consider crusted scabies in the differential diagnosis of erythroderma, especially in immunocompromised patients, to avoid delays in diagnosis and treatment. Immunosuppressive therapy is an important mainstay in the treatment of many conditions, but it is important to consider that these medications can place patients at an increased risk for rare opportunistic infections. Therefore, patients receiving such treatment should be closely monitored.

Scabies is caused by cutaneous ectoparasitic infection by the mite Sarcoptes scabiei var hominis. The infection is highly contagious via direct skin-to-skin contact or indirectly through infested bedding, clothing or fomites.^1,2 Scabies occurs at all ages, in all ethnic groups, and at all socioeconomic levels.¹ Analysis by the Global Burden of Disease estimates that 200 million individuals have been infected with scabies worldwide. The World Health Organization has declared scabies a neglected tropical disease.³

Crusted scabies is a severe and rare form of scabies, with hyperinfestation of thousands to millions of mites, and more commonly is associated with immunosuppressed states, including HIV and hematologic malignancies.^1,2,4 Crusted scabies has a high mortality rate due to sepsis when left untreated.^3,5

Occasionally, iatrogenic immunosuppression contributes to the development of crusted scabies.^1,2 Iatrogenic immunosuppression leading to crusted scabies most commonly occurs secondary to immunosuppression after bone marrow or solid organ transplantation.⁶ Less often, crusted scabies is caused by iatrogenic immunosuppression from other clinical scenarios.^1,2

We describe a patient with iatrogenic immunosuppression due to azathioprine-induced myelosuppression for the treatment of granulomatosis with polyangiitis (GPA) who developed crusted scabies that clinically presented as erythroderma. Crusted scabies should be included in the differential diagnosis of erythroderma, especially in the setting of iatrogenic immunosuppression, for timely and appropriate management.

Case Report

An 84-year-old man presented with worsening pruritus, erythema, and thick yellow scale that progressed to erythroderma over the last 2 weeks. He was diagnosed with GPA 6 months prior to presentation and was treated with azathioprine 150 mg/d, prednisone 10 mg/d, and sulfamethoxazole 800 mg plus trimethoprim 160 mg twice weekly for prophylaxis against Pneumocystis jirovecii pneumonia.

Three weeks prior to presentation, the patient was hospitalized for pancytopenia attributed to azathioprine-induced myelosuppression (hemoglobin, 6.1 g/dL [reference range, 13.5–18.0 g/dL]; hematocrit, 17.5% [reference range, 42%–52%]; white blood cell count, 1.66×10³/μL [reference range, 4.0–10.5×10³/μL]; platelet count, 146×10³/μL [reference range, 150–450×10³/μL]; absolute neutrophil count, 1.29×10³/μL [reference range, 1.4–6.5×10³/μL]). He was transferred to a skilled nursing facility after discharge and referred to dermatology for evaluation of the worsening pruritic rash.

At the current presentation, the patient denied close contact with anyone who had a similar rash at home or at the skilled nursing facility. Physical examination revealed diffuse erythroderma with yellow scale on the scalp, trunk, arms, and legs (Figure 1). The palms showed scattered 2- to 3-mm pustules. The mucosal surfaces did not have lesions. A punch biopsy of a pustule from the right arm revealed focal spongiosis, parakeratosis, and acanthosis, as well as a perivascular and interstitial mixed inflammatory infiltrate with lymphocytes and eosinophils. Organisms morphologically compatible with scabies were found in the stratum corneum (Figure 2). Another punch biopsy of a pustule from the right arm was performed for direct immunofluorescence (DIF) and was negative for immunoglobulin deposition. Mineral oil preparation from pustules on the palm was positive for mites.

The patient was treated with permethrin cream 5% and oral ivermectin 200 μg/kg on day 1 and day 10. The prednisone dosage was increased from 10 mg/d to 50 mg/d and tapered over 2 weeks to treat the symptomatic rash and GPA. He remains on maintenance rituximab for GPA, without recurrence of scabies.

Comment

Pathogenesis—As an obligate parasite, S scabiei spends its entire life cycle within the host. Impregnated female mites burrow into the epidermis after mating and lay eggs daily for 1 to 2 months. Eggs hatch 2 or 3 days later. Larvae then migrate to the skin surface; burrow into the stratum corneum, where they mature into adults; and then mate on the skin surface.^1,4

Clinical Presentation and Sequelae—Typically, scabies presents 2 to 6 weeks after initial exposure with generalized and intense itching and inflammatory pruritic papules on the finger webs, wrists, elbows, axillae, buttocks, umbilicus, genitalia, and areolae.¹ Burrows are specific for scabies but may not always be present. Often, there are nonspecific secondary lesions, including excoriations, dermatitis, and impetiginization.

Complications of scabies can be severe, with initial colonization and infection of the skin resulting in impetigo and cellulitis. Systematic sequelae from local skin infection include post-streptococcal glomerulonephritis, rheumatic fever, and sepsis. Mortality from sepsis in scabies can be high.^3,5

Classic Crusted Scabies and Other Variants—Crusted scabies presents with psoriasiform hyperkeratotic plaques involving the hands and feet with potential nail involvement that can become more generalized.¹ Alterations in CD4⁺ T-cell function have been implicated in the development of crusted scabies, in which an excessive helper T cell (T_H2) response is elicited against the ectoparasite, which may help explain the intense pruritus of scabies.⁶ Occasionally, iatrogenic immunosuppression contributes to development of crusted scabies,¹ as was the case with our patient. However, it is rare for crusted scabies to present with erythroderma.⁷

Other atypical presentations of scabies include a seborrheic dermatitis–like presentation in infants, nodular lesions in the groin and axillae in more chronic scabies, and vesicles or bullous lesions.¹

Diagnosis—Identification of mites, eggs, or feces is necessary for definitive diagnosis of scabies.⁸ These materials can be obtained through skin scrapings with mineral oil and observed under light microscopy or direct dermoscopy. Multiple scrapings on many lesions should be performed because failure to identify mites can be common and does not rule out scabies. Dermoscopic examination of active lesions under low power also can be helpful, given that identification of dark brown triangular structures can correspond to visualization of the pigmented anterior section of the mite.^9-11 A skin biopsy can help identify mites, but histopathology often shows a nonspecific hypersensitivity reaction.¹² Therefore, empiric treatment often is necessary.

Differential Diagnosis—The differential diagnosis of erythroderma is broad and includes a drug eruption; Sézary syndrome; and pre-existing skin diseases, including psoriasis, atopic dermatitis, pityriasis rubra pilaris, pemphigus foliaceus, and bullous pemphigoid. Histopathology is critical to differentiate these diagnoses. Bullous pemphigoid and pemphigus foliaceus are immunobullous diseases that typically are positive for immunoglobulin deposition on DIF. In rare cases, scabies also can present with bullae and positive DIF test results.¹³

Treatment—First-line treatment of crusted scabies in the United States is permethrin cream 5%, followed by oral ivermectin 200 μg/kg.^4,5,14,15 Other scabicides include topicals such as benzyl benzoate 10% to 25%; precipitated sulfur 2% to 10%; crotamiton 10%; malathion 0.5%; and lindane 1%.⁵ The association of neurotoxicity with lindane has considerably reduced the drug’s use.¹

During treatment of scabies, it is important to isolate patients to mitigate the possibility of spread.⁴ Pruritus can persist for a few weeks after completion of therapy.⁵ Patients should be closely monitored to ensure that this symptom is secondary to skin inflammation and not incomplete treatment.

Treatment of crusted scabies may require repeated treatments to decrease the notable mite burden as well as the associated crusting and scale. Adding a keratolytic such as 5% to 10% salicylic acid in petrolatum to the treatment regimen may be useful for breaking up thick scale.⁵

Immunosuppression—With numerous immunomodulatory drugs for treating autoimmunity comes an increased risk for iatrogenic immunosuppression that may contribute to the development of crusted scabies.¹⁶ In a number of autoimmune diseases such as rheumatoid arthritis,^17-19 psoriasis,^20,21 pemphigus vulgaris,²² systemic lupus erythematosus,²³ systemic sclerosis,^22,24 bullous pemphigoid,^25,26 and dermatomyositis,²⁷ patients have developed crusted scabies secondary to treatment-related immunosuppression. These immunosuppressive therapies include systemic steroids,^22-24,26-31 methotrexate,²³ infliximab,¹⁸ adalimumab,²¹ toclizumab,¹⁹ and etanercept.²⁰ In a case of drug-induced Stevens-Johnson syndrome, the patient developed crusted scabies during long-term use of oral steroids.²²

Patients with a malignancy who are being treated with chemotherapy also can develop crusted scabies.²⁸ Crusted scabies has even been associated with long-term topical steroid^32-34 and topical calcineurin inhibitor use.¹⁶

Iatrogenic immunosuppression in our patient resulted from treatment of GPA with azathioprine, an immunosuppressive drug that acts as an antagonist of the breakdown of purines, leading to inhibition of DNA, RNA, and protein synthesis.³⁵ On occasion, azathioprine can induce immunosuppression in the form of myelosuppression and resulting pancytopenia, as was the case with our patient.

Conclusion

Although scabies is designated as a neglected tropical disease by the World Health Organization, it still causes a notable burden worldwide, regardless of the economics. Our case highlights an unusual presentation of scabies as erythroderma in the setting of iatrogenic immunosuppression from azathioprine use. Dermatologists should consider crusted scabies in the differential diagnosis of erythroderma, especially in immunocompromised patients, to avoid delays in diagnosis and treatment. Immunosuppressive therapy is an important mainstay in the treatment of many conditions, but it is important to consider that these medications can place patients at an increased risk for rare opportunistic infections. Therefore, patients receiving such treatment should be closely monitored.

Scabies is caused by cutaneous ectoparasitic infection by the mite Sarcoptes scabiei var hominis. The infection is highly contagious via direct skin-to-skin contact or indirectly through infested bedding, clothing or fomites.^1,2 Scabies occurs at all ages, in all ethnic groups, and at all socioeconomic levels.¹ Analysis by the Global Burden of Disease estimates that 200 million individuals have been infected with scabies worldwide. The World Health Organization has declared scabies a neglected tropical disease.³

Crusted scabies is a severe and rare form of scabies, with hyperinfestation of thousands to millions of mites, and more commonly is associated with immunosuppressed states, including HIV and hematologic malignancies.^1,2,4 Crusted scabies has a high mortality rate due to sepsis when left untreated.^3,5

Occasionally, iatrogenic immunosuppression contributes to the development of crusted scabies.^1,2 Iatrogenic immunosuppression leading to crusted scabies most commonly occurs secondary to immunosuppression after bone marrow or solid organ transplantation.⁶ Less often, crusted scabies is caused by iatrogenic immunosuppression from other clinical scenarios.^1,2

We describe a patient with iatrogenic immunosuppression due to azathioprine-induced myelosuppression for the treatment of granulomatosis with polyangiitis (GPA) who developed crusted scabies that clinically presented as erythroderma. Crusted scabies should be included in the differential diagnosis of erythroderma, especially in the setting of iatrogenic immunosuppression, for timely and appropriate management.

Case Report

An 84-year-old man presented with worsening pruritus, erythema, and thick yellow scale that progressed to erythroderma over the last 2 weeks. He was diagnosed with GPA 6 months prior to presentation and was treated with azathioprine 150 mg/d, prednisone 10 mg/d, and sulfamethoxazole 800 mg plus trimethoprim 160 mg twice weekly for prophylaxis against Pneumocystis jirovecii pneumonia.

Three weeks prior to presentation, the patient was hospitalized for pancytopenia attributed to azathioprine-induced myelosuppression (hemoglobin, 6.1 g/dL [reference range, 13.5–18.0 g/dL]; hematocrit, 17.5% [reference range, 42%–52%]; white blood cell count, 1.66×10³/μL [reference range, 4.0–10.5×10³/μL]; platelet count, 146×10³/μL [reference range, 150–450×10³/μL]; absolute neutrophil count, 1.29×10³/μL [reference range, 1.4–6.5×10³/μL]). He was transferred to a skilled nursing facility after discharge and referred to dermatology for evaluation of the worsening pruritic rash.

At the current presentation, the patient denied close contact with anyone who had a similar rash at home or at the skilled nursing facility. Physical examination revealed diffuse erythroderma with yellow scale on the scalp, trunk, arms, and legs (Figure 1). The palms showed scattered 2- to 3-mm pustules. The mucosal surfaces did not have lesions. A punch biopsy of a pustule from the right arm revealed focal spongiosis, parakeratosis, and acanthosis, as well as a perivascular and interstitial mixed inflammatory infiltrate with lymphocytes and eosinophils. Organisms morphologically compatible with scabies were found in the stratum corneum (Figure 2). Another punch biopsy of a pustule from the right arm was performed for direct immunofluorescence (DIF) and was negative for immunoglobulin deposition. Mineral oil preparation from pustules on the palm was positive for mites.

The patient was treated with permethrin cream 5% and oral ivermectin 200 μg/kg on day 1 and day 10. The prednisone dosage was increased from 10 mg/d to 50 mg/d and tapered over 2 weeks to treat the symptomatic rash and GPA. He remains on maintenance rituximab for GPA, without recurrence of scabies.

Comment

Pathogenesis—As an obligate parasite, S scabiei spends its entire life cycle within the host. Impregnated female mites burrow into the epidermis after mating and lay eggs daily for 1 to 2 months. Eggs hatch 2 or 3 days later. Larvae then migrate to the skin surface; burrow into the stratum corneum, where they mature into adults; and then mate on the skin surface.^1,4

Clinical Presentation and Sequelae—Typically, scabies presents 2 to 6 weeks after initial exposure with generalized and intense itching and inflammatory pruritic papules on the finger webs, wrists, elbows, axillae, buttocks, umbilicus, genitalia, and areolae.¹ Burrows are specific for scabies but may not always be present. Often, there are nonspecific secondary lesions, including excoriations, dermatitis, and impetiginization.

Complications of scabies can be severe, with initial colonization and infection of the skin resulting in impetigo and cellulitis. Systematic sequelae from local skin infection include post-streptococcal glomerulonephritis, rheumatic fever, and sepsis. Mortality from sepsis in scabies can be high.^3,5

Classic Crusted Scabies and Other Variants—Crusted scabies presents with psoriasiform hyperkeratotic plaques involving the hands and feet with potential nail involvement that can become more generalized.¹ Alterations in CD4⁺ T-cell function have been implicated in the development of crusted scabies, in which an excessive helper T cell (T_H2) response is elicited against the ectoparasite, which may help explain the intense pruritus of scabies.⁶ Occasionally, iatrogenic immunosuppression contributes to development of crusted scabies,¹ as was the case with our patient. However, it is rare for crusted scabies to present with erythroderma.⁷

Other atypical presentations of scabies include a seborrheic dermatitis–like presentation in infants, nodular lesions in the groin and axillae in more chronic scabies, and vesicles or bullous lesions.¹

Diagnosis—Identification of mites, eggs, or feces is necessary for definitive diagnosis of scabies.⁸ These materials can be obtained through skin scrapings with mineral oil and observed under light microscopy or direct dermoscopy. Multiple scrapings on many lesions should be performed because failure to identify mites can be common and does not rule out scabies. Dermoscopic examination of active lesions under low power also can be helpful, given that identification of dark brown triangular structures can correspond to visualization of the pigmented anterior section of the mite.^9-11 A skin biopsy can help identify mites, but histopathology often shows a nonspecific hypersensitivity reaction.¹² Therefore, empiric treatment often is necessary.

Differential Diagnosis—The differential diagnosis of erythroderma is broad and includes a drug eruption; Sézary syndrome; and pre-existing skin diseases, including psoriasis, atopic dermatitis, pityriasis rubra pilaris, pemphigus foliaceus, and bullous pemphigoid. Histopathology is critical to differentiate these diagnoses. Bullous pemphigoid and pemphigus foliaceus are immunobullous diseases that typically are positive for immunoglobulin deposition on DIF. In rare cases, scabies also can present with bullae and positive DIF test results.¹³

Treatment—First-line treatment of crusted scabies in the United States is permethrin cream 5%, followed by oral ivermectin 200 μg/kg.^4,5,14,15 Other scabicides include topicals such as benzyl benzoate 10% to 25%; precipitated sulfur 2% to 10%; crotamiton 10%; malathion 0.5%; and lindane 1%.⁵ The association of neurotoxicity with lindane has considerably reduced the drug’s use.¹

During treatment of scabies, it is important to isolate patients to mitigate the possibility of spread.⁴ Pruritus can persist for a few weeks after completion of therapy.⁵ Patients should be closely monitored to ensure that this symptom is secondary to skin inflammation and not incomplete treatment.

Treatment of crusted scabies may require repeated treatments to decrease the notable mite burden as well as the associated crusting and scale. Adding a keratolytic such as 5% to 10% salicylic acid in petrolatum to the treatment regimen may be useful for breaking up thick scale.⁵

Immunosuppression—With numerous immunomodulatory drugs for treating autoimmunity comes an increased risk for iatrogenic immunosuppression that may contribute to the development of crusted scabies.¹⁶ In a number of autoimmune diseases such as rheumatoid arthritis,^17-19 psoriasis,^20,21 pemphigus vulgaris,²² systemic lupus erythematosus,²³ systemic sclerosis,^22,24 bullous pemphigoid,^25,26 and dermatomyositis,²⁷ patients have developed crusted scabies secondary to treatment-related immunosuppression. These immunosuppressive therapies include systemic steroids,^22-24,26-31 methotrexate,²³ infliximab,¹⁸ adalimumab,²¹ toclizumab,¹⁹ and etanercept.²⁰ In a case of drug-induced Stevens-Johnson syndrome, the patient developed crusted scabies during long-term use of oral steroids.²²

Patients with a malignancy who are being treated with chemotherapy also can develop crusted scabies.²⁸ Crusted scabies has even been associated with long-term topical steroid^32-34 and topical calcineurin inhibitor use.¹⁶

Iatrogenic immunosuppression in our patient resulted from treatment of GPA with azathioprine, an immunosuppressive drug that acts as an antagonist of the breakdown of purines, leading to inhibition of DNA, RNA, and protein synthesis.³⁵ On occasion, azathioprine can induce immunosuppression in the form of myelosuppression and resulting pancytopenia, as was the case with our patient.

Conclusion

Although scabies is designated as a neglected tropical disease by the World Health Organization, it still causes a notable burden worldwide, regardless of the economics. Our case highlights an unusual presentation of scabies as erythroderma in the setting of iatrogenic immunosuppression from azathioprine use. Dermatologists should consider crusted scabies in the differential diagnosis of erythroderma, especially in immunocompromised patients, to avoid delays in diagnosis and treatment. Immunosuppressive therapy is an important mainstay in the treatment of many conditions, but it is important to consider that these medications can place patients at an increased risk for rare opportunistic infections. Therefore, patients receiving such treatment should be closely monitored.

To the Editor:

A 47-year-old man presented to the dermatology service with an asymptomatic plaque on the right thigh of 2 months’ duration. He had a medical history of HIV and Kaposi sarcoma as well as a recently relapsed primary effusion lymphoma (PEL) subsequent to an allogeneic bone marrow transplant. He initially was diagnosed with PEL 3 years prior to the current presentation during a workup for fever and weight loss. Imaging at the time demonstrated a bladder mass, which was biopsied and demonstrated PEL. Further imaging demonstrated both sinus and bone marrow involvement. Prior to dermatologic consultation, he had been treated with 6 cycles of etoposide, prednisolone, vincristine, cyclophosphamide, and doxorubicin (EPOCH); 6 cycles of brentuximab; 4 cycles of rituximab with gemcitabine and oxaliplatin; and 2 cycles of ifosfamide, carboplatin, and etoposide. Despite these therapies, he had 3 relapses, and oncology determined the need for a matched unrelated donor allogeneic stem cell transplant for his PEL.

At the time of dermatology consultation, the patient was being managed on daratumumab and bortezomib. Physical examination revealed an infiltrative plaque on the right inferomedial thigh measuring approximately 6.0 cm (largest dimension) with a small amount of peripheral scale (Figure 1). An ultrasound revealed notable subcutaneous tissue edema and increased vascularity without a discrete mass or fluid collection. A 4-mm punch biopsy demonstrated a dense infiltrate comprised of collections of histiocytes admixed with scattered plasma cells and mature lymphoid aggregates. Additionally, rare enlarged plasmablastic cells with scant basophilic cytoplasm and slightly irregular nuclear contours were visualized (Figure 2A). Immunohistochemistry was positive for CD3 with a normal CD4:CD8 ratio, CD68-highlighted histiocytes within the lymphoid aggregates, and human herpesvirus 8 (HHV-8)(or Kaposi sarcoma–associated herpesvirus) demonstrated stippled nuclear staining within the scattered large cells (Figure 2B). Epstein-Barr virus–encoded RNA staining was negative, though the area of interest was lost on deeper sectioning of the tissue block. The histopathologic findings were consistent with cutaneous extracavitary PEL. Shortly after this diagnosis, he died from disease complications.

Primary effusion lymphoma is an aggressive non-Hodgkin B-cell lymphoma that was first described by Knowles et al¹ in 1989. Primary effusion lymphoma occurs exclusively in the setting of HHV-8 infection and typically is associated with chronic immunosuppression related to HIV/AIDS. Cases that are negative for HIV-1 are rare but have been reported in organ transplant recipients and elderly men from areas with a high prevalence of HHV-8 infections. Most HIV-associated cases show concurrent Epstein-Barr virus infection, though the pathogenic meaning of this co-infection remains unclear.^2,3

Primary effusion lymphoma classically presents as an isolated effusion of malignant lymphoid cells within body cavities in the absence of solid tumor masses. The pleural, peritoneal, and pericardial spaces most commonly are involved. Extracavitary PEL, a rare variant, may present as a solid mass without effusion. In general, extracavitary tumors may occur in the setting of de novo malignancy or recurrent PEL.⁴ Cutaneous manifestations associated with extracavitary PEL are rare; 4 cases have been described in which skin lesions were the heralding sign of the disease.³ Interestingly, despite obligatory underlying HHV-8 infection, a review by Pielasinski et al³ noted only 2 patients with cutaneous PEL who had prior or concurrent Kaposi sarcoma. This heterogeneity in HHV-8–related phenotypes may be related to differences in microRNA expression, but further study is needed.⁵

The diagnosis of PEL relies on histologic, immunophenotypic, and molecular analysis of the affected tissue. The malignant cells typically are large with round to irregular nuclei. These cells may demonstrate a variety of appearances, including anaplastic, plasmablastic, and immunoblastic morphologies.^6,7 The immunophenotype displays CD45 positivity and markers of lymphocyte activation (CD30, CD38, CD71), while typical B-cell (CD19, CD20, CD79a) and T-cell (CD3, CD4, CD8) markers often are absent.^6-8 Human herpesvirus 8 detection by polymerase chain reaction testing of the peripheral blood or by immunohistochemistry staining of the affected tissue is required for diagnosis.^6,7 Epstein-Barr virus infection may be detected via in situ hybridization, though it is not required for diagnosis.

The overall prognosis for PEL is poor; Brimo et al⁶ reported a median survival of less than 6 months, and Guillet et al⁹ reported 5-year overall survival (OS) for PEL vs extracavitary PEL to be 43% vs 39%. Another review noted variation in survival contingent on the number of body cavities involved; patients with a single body cavity involved experienced a median OS of 18 months, whereas patients with multiple involved cavities experienced a median OS of 4 months,⁷ possibly due to the limited study of treatment regimens or disease aggressiveness. Even in cases of successful initial treatment, relapse within 6 to 8 months is common. Extracavitary PEL may have improved disease-free survival relative to classic PEL, though the data were less clear for OS.⁹ Limitations of the Guillet et al⁹ study included a small sample size, the impossibility to randomize to disease type, and loss of power on the log-rank test for OS in the setting of possible nonproportional hazards (crossing survival curves). Overall, prognostic differences between the groups may be challenging to ascertain until further data are obtained.

As with many HIV-associated neoplasms, antiretroviral treatment (ART) for HIV-positive patients affords a better prognosis when used in addition to therapy directed at malignancy.⁷ The general approach is for concurrent ART with systemic therapies such as rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone for the rare CD20⁺ cases, and cyclophosphamide, doxorubicin, vincristine, and prednisone (CHOP) or dose-adjusted EPOCH therapy in the more common CD20⁻ PEL cases. Narkhede et al⁷ suggested avoidance of methotrexate in patients with effusions because of increased toxicity, but it is unclear if this recommendation is applicable in extracavitary PEL patients without an effusion. Additionally, second-line treatment modalities include radiation for solid PEL masses, HHV-8–targeted antivirals, and stem cell transplantation, though evidence is limited. Of note, there is a phase I-II trial (ClinicalTrials.gov identifier NCT02911142) ongoing for treatment-naïve PEL patients involving the experimental treatment DA-EPOCH-R plus lenalidomide, but the trial is ongoing.¹⁰

We report a case of cutaneous PEL in a patient with a history of Kaposi sarcoma. The patient’s deterioration and ultimate death despite initial treatment with EPOCH and bone marrow transplantation followed by final management with daratumumab and bortezomib confirm other reports that PEL has a poor prognosis and that optimal treatments are not well delineated for these patients. In general, the current approach is to utilize ART for HIV-positive patients and to then implement chemotherapy such as CHOP. Without continued research and careful planning of treatments, data will remain limited on how best to serve patients with PEL.

To the Editor:

A 47-year-old man presented to the dermatology service with an asymptomatic plaque on the right thigh of 2 months’ duration. He had a medical history of HIV and Kaposi sarcoma as well as a recently relapsed primary effusion lymphoma (PEL) subsequent to an allogeneic bone marrow transplant. He initially was diagnosed with PEL 3 years prior to the current presentation during a workup for fever and weight loss. Imaging at the time demonstrated a bladder mass, which was biopsied and demonstrated PEL. Further imaging demonstrated both sinus and bone marrow involvement. Prior to dermatologic consultation, he had been treated with 6 cycles of etoposide, prednisolone, vincristine, cyclophosphamide, and doxorubicin (EPOCH); 6 cycles of brentuximab; 4 cycles of rituximab with gemcitabine and oxaliplatin; and 2 cycles of ifosfamide, carboplatin, and etoposide. Despite these therapies, he had 3 relapses, and oncology determined the need for a matched unrelated donor allogeneic stem cell transplant for his PEL.

At the time of dermatology consultation, the patient was being managed on daratumumab and bortezomib. Physical examination revealed an infiltrative plaque on the right inferomedial thigh measuring approximately 6.0 cm (largest dimension) with a small amount of peripheral scale (Figure 1). An ultrasound revealed notable subcutaneous tissue edema and increased vascularity without a discrete mass or fluid collection. A 4-mm punch biopsy demonstrated a dense infiltrate comprised of collections of histiocytes admixed with scattered plasma cells and mature lymphoid aggregates. Additionally, rare enlarged plasmablastic cells with scant basophilic cytoplasm and slightly irregular nuclear contours were visualized (Figure 2A). Immunohistochemistry was positive for CD3 with a normal CD4:CD8 ratio, CD68-highlighted histiocytes within the lymphoid aggregates, and human herpesvirus 8 (HHV-8)(or Kaposi sarcoma–associated herpesvirus) demonstrated stippled nuclear staining within the scattered large cells (Figure 2B). Epstein-Barr virus–encoded RNA staining was negative, though the area of interest was lost on deeper sectioning of the tissue block. The histopathologic findings were consistent with cutaneous extracavitary PEL. Shortly after this diagnosis, he died from disease complications.

Primary effusion lymphoma is an aggressive non-Hodgkin B-cell lymphoma that was first described by Knowles et al¹ in 1989. Primary effusion lymphoma occurs exclusively in the setting of HHV-8 infection and typically is associated with chronic immunosuppression related to HIV/AIDS. Cases that are negative for HIV-1 are rare but have been reported in organ transplant recipients and elderly men from areas with a high prevalence of HHV-8 infections. Most HIV-associated cases show concurrent Epstein-Barr virus infection, though the pathogenic meaning of this co-infection remains unclear.^2,3

Primary effusion lymphoma classically presents as an isolated effusion of malignant lymphoid cells within body cavities in the absence of solid tumor masses. The pleural, peritoneal, and pericardial spaces most commonly are involved. Extracavitary PEL, a rare variant, may present as a solid mass without effusion. In general, extracavitary tumors may occur in the setting of de novo malignancy or recurrent PEL.⁴ Cutaneous manifestations associated with extracavitary PEL are rare; 4 cases have been described in which skin lesions were the heralding sign of the disease.³ Interestingly, despite obligatory underlying HHV-8 infection, a review by Pielasinski et al³ noted only 2 patients with cutaneous PEL who had prior or concurrent Kaposi sarcoma. This heterogeneity in HHV-8–related phenotypes may be related to differences in microRNA expression, but further study is needed.⁵

The diagnosis of PEL relies on histologic, immunophenotypic, and molecular analysis of the affected tissue. The malignant cells typically are large with round to irregular nuclei. These cells may demonstrate a variety of appearances, including anaplastic, plasmablastic, and immunoblastic morphologies.^6,7 The immunophenotype displays CD45 positivity and markers of lymphocyte activation (CD30, CD38, CD71), while typical B-cell (CD19, CD20, CD79a) and T-cell (CD3, CD4, CD8) markers often are absent.^6-8 Human herpesvirus 8 detection by polymerase chain reaction testing of the peripheral blood or by immunohistochemistry staining of the affected tissue is required for diagnosis.^6,7 Epstein-Barr virus infection may be detected via in situ hybridization, though it is not required for diagnosis.

The overall prognosis for PEL is poor; Brimo et al⁶ reported a median survival of less than 6 months, and Guillet et al⁹ reported 5-year overall survival (OS) for PEL vs extracavitary PEL to be 43% vs 39%. Another review noted variation in survival contingent on the number of body cavities involved; patients with a single body cavity involved experienced a median OS of 18 months, whereas patients with multiple involved cavities experienced a median OS of 4 months,⁷ possibly due to the limited study of treatment regimens or disease aggressiveness. Even in cases of successful initial treatment, relapse within 6 to 8 months is common. Extracavitary PEL may have improved disease-free survival relative to classic PEL, though the data were less clear for OS.⁹ Limitations of the Guillet et al⁹ study included a small sample size, the impossibility to randomize to disease type, and loss of power on the log-rank test for OS in the setting of possible nonproportional hazards (crossing survival curves). Overall, prognostic differences between the groups may be challenging to ascertain until further data are obtained.

As with many HIV-associated neoplasms, antiretroviral treatment (ART) for HIV-positive patients affords a better prognosis when used in addition to therapy directed at malignancy.⁷ The general approach is for concurrent ART with systemic therapies such as rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone for the rare CD20⁺ cases, and cyclophosphamide, doxorubicin, vincristine, and prednisone (CHOP) or dose-adjusted EPOCH therapy in the more common CD20⁻ PEL cases. Narkhede et al⁷ suggested avoidance of methotrexate in patients with effusions because of increased toxicity, but it is unclear if this recommendation is applicable in extracavitary PEL patients without an effusion. Additionally, second-line treatment modalities include radiation for solid PEL masses, HHV-8–targeted antivirals, and stem cell transplantation, though evidence is limited. Of note, there is a phase I-II trial (ClinicalTrials.gov identifier NCT02911142) ongoing for treatment-naïve PEL patients involving the experimental treatment DA-EPOCH-R plus lenalidomide, but the trial is ongoing.¹⁰

We report a case of cutaneous PEL in a patient with a history of Kaposi sarcoma. The patient’s deterioration and ultimate death despite initial treatment with EPOCH and bone marrow transplantation followed by final management with daratumumab and bortezomib confirm other reports that PEL has a poor prognosis and that optimal treatments are not well delineated for these patients. In general, the current approach is to utilize ART for HIV-positive patients and to then implement chemotherapy such as CHOP. Without continued research and careful planning of treatments, data will remain limited on how best to serve patients with PEL.

To the Editor:

A 47-year-old man presented to the dermatology service with an asymptomatic plaque on the right thigh of 2 months’ duration. He had a medical history of HIV and Kaposi sarcoma as well as a recently relapsed primary effusion lymphoma (PEL) subsequent to an allogeneic bone marrow transplant. He initially was diagnosed with PEL 3 years prior to the current presentation during a workup for fever and weight loss. Imaging at the time demonstrated a bladder mass, which was biopsied and demonstrated PEL. Further imaging demonstrated both sinus and bone marrow involvement. Prior to dermatologic consultation, he had been treated with 6 cycles of etoposide, prednisolone, vincristine, cyclophosphamide, and doxorubicin (EPOCH); 6 cycles of brentuximab; 4 cycles of rituximab with gemcitabine and oxaliplatin; and 2 cycles of ifosfamide, carboplatin, and etoposide. Despite these therapies, he had 3 relapses, and oncology determined the need for a matched unrelated donor allogeneic stem cell transplant for his PEL.

At the time of dermatology consultation, the patient was being managed on daratumumab and bortezomib. Physical examination revealed an infiltrative plaque on the right inferomedial thigh measuring approximately 6.0 cm (largest dimension) with a small amount of peripheral scale (Figure 1). An ultrasound revealed notable subcutaneous tissue edema and increased vascularity without a discrete mass or fluid collection. A 4-mm punch biopsy demonstrated a dense infiltrate comprised of collections of histiocytes admixed with scattered plasma cells and mature lymphoid aggregates. Additionally, rare enlarged plasmablastic cells with scant basophilic cytoplasm and slightly irregular nuclear contours were visualized (Figure 2A). Immunohistochemistry was positive for CD3 with a normal CD4:CD8 ratio, CD68-highlighted histiocytes within the lymphoid aggregates, and human herpesvirus 8 (HHV-8)(or Kaposi sarcoma–associated herpesvirus) demonstrated stippled nuclear staining within the scattered large cells (Figure 2B). Epstein-Barr virus–encoded RNA staining was negative, though the area of interest was lost on deeper sectioning of the tissue block. The histopathologic findings were consistent with cutaneous extracavitary PEL. Shortly after this diagnosis, he died from disease complications.

Primary effusion lymphoma is an aggressive non-Hodgkin B-cell lymphoma that was first described by Knowles et al¹ in 1989. Primary effusion lymphoma occurs exclusively in the setting of HHV-8 infection and typically is associated with chronic immunosuppression related to HIV/AIDS. Cases that are negative for HIV-1 are rare but have been reported in organ transplant recipients and elderly men from areas with a high prevalence of HHV-8 infections. Most HIV-associated cases show concurrent Epstein-Barr virus infection, though the pathogenic meaning of this co-infection remains unclear.^2,3

Primary effusion lymphoma classically presents as an isolated effusion of malignant lymphoid cells within body cavities in the absence of solid tumor masses. The pleural, peritoneal, and pericardial spaces most commonly are involved. Extracavitary PEL, a rare variant, may present as a solid mass without effusion. In general, extracavitary tumors may occur in the setting of de novo malignancy or recurrent PEL.⁴ Cutaneous manifestations associated with extracavitary PEL are rare; 4 cases have been described in which skin lesions were the heralding sign of the disease.³ Interestingly, despite obligatory underlying HHV-8 infection, a review by Pielasinski et al³ noted only 2 patients with cutaneous PEL who had prior or concurrent Kaposi sarcoma. This heterogeneity in HHV-8–related phenotypes may be related to differences in microRNA expression, but further study is needed.⁵

The diagnosis of PEL relies on histologic, immunophenotypic, and molecular analysis of the affected tissue. The malignant cells typically are large with round to irregular nuclei. These cells may demonstrate a variety of appearances, including anaplastic, plasmablastic, and immunoblastic morphologies.^6,7 The immunophenotype displays CD45 positivity and markers of lymphocyte activation (CD30, CD38, CD71), while typical B-cell (CD19, CD20, CD79a) and T-cell (CD3, CD4, CD8) markers often are absent.^6-8 Human herpesvirus 8 detection by polymerase chain reaction testing of the peripheral blood or by immunohistochemistry staining of the affected tissue is required for diagnosis.^6,7 Epstein-Barr virus infection may be detected via in situ hybridization, though it is not required for diagnosis.

The overall prognosis for PEL is poor; Brimo et al⁶ reported a median survival of less than 6 months, and Guillet et al⁹ reported 5-year overall survival (OS) for PEL vs extracavitary PEL to be 43% vs 39%. Another review noted variation in survival contingent on the number of body cavities involved; patients with a single body cavity involved experienced a median OS of 18 months, whereas patients with multiple involved cavities experienced a median OS of 4 months,⁷ possibly due to the limited study of treatment regimens or disease aggressiveness. Even in cases of successful initial treatment, relapse within 6 to 8 months is common. Extracavitary PEL may have improved disease-free survival relative to classic PEL, though the data were less clear for OS.⁹ Limitations of the Guillet et al⁹ study included a small sample size, the impossibility to randomize to disease type, and loss of power on the log-rank test for OS in the setting of possible nonproportional hazards (crossing survival curves). Overall, prognostic differences between the groups may be challenging to ascertain until further data are obtained.

As with many HIV-associated neoplasms, antiretroviral treatment (ART) for HIV-positive patients affords a better prognosis when used in addition to therapy directed at malignancy.⁷ The general approach is for concurrent ART with systemic therapies such as rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone for the rare CD20⁺ cases, and cyclophosphamide, doxorubicin, vincristine, and prednisone (CHOP) or dose-adjusted EPOCH therapy in the more common CD20⁻ PEL cases. Narkhede et al⁷ suggested avoidance of methotrexate in patients with effusions because of increased toxicity, but it is unclear if this recommendation is applicable in extracavitary PEL patients without an effusion. Additionally, second-line treatment modalities include radiation for solid PEL masses, HHV-8–targeted antivirals, and stem cell transplantation, though evidence is limited. Of note, there is a phase I-II trial (ClinicalTrials.gov identifier NCT02911142) ongoing for treatment-naïve PEL patients involving the experimental treatment DA-EPOCH-R plus lenalidomide, but the trial is ongoing.¹⁰

We report a case of cutaneous PEL in a patient with a history of Kaposi sarcoma. The patient’s deterioration and ultimate death despite initial treatment with EPOCH and bone marrow transplantation followed by final management with daratumumab and bortezomib confirm other reports that PEL has a poor prognosis and that optimal treatments are not well delineated for these patients. In general, the current approach is to utilize ART for HIV-positive patients and to then implement chemotherapy such as CHOP. Without continued research and careful planning of treatments, data will remain limited on how best to serve patients with PEL.

MILAN – Patients with psoriatic arthritis (PsA) who are using biologic and targeted synthetic disease-modifying antirheumatic drugs (b/tsDMARDs) have fivefold higher risk for interstitial lung disease (ILD) than does the general population, according to the first study to explore risk of ILD in this particular patient group.

The study also found 10-fold higher risk of ILD in patients with RA who were starting a b/tsDMARD, compared with the general population, while the addition of methotrexate did not appear to be associated with increased risk for ILD in either RA nor PsA.

Becky McCall/MDedge News

Sella Aarrestad Provan, MD, of the Center for Treatment of Rheumatic and Musculoskeletal Diseases at Diakonhjemmet Hospital, Oslo, presented the results at the annual European Congress of Rheumatology.

Explaining the motivation for the study, Dr. Aarrestad Provan said that, in RA, methotrexate’s role in ILD development remained unclear, while some small studies linked b/tsDMARDs with risk for ILD. “In PsA, very few studies have explored the risk of ILD, and no systematic studies have looked at ILD risk factors in this disease.”

The researchers analyzed patient data from hospital and death registries across five Nordic countries (Denmark, Norway, Finland, Iceland, and Sweden) and compared them with general population controls. They calculated risk ratios for people who developed ILD within 5 years of starting a b/tsDMARD (with or without methotrexate).

A total of 37,010 patients with RA, 12,341 with PsA, and 569,451 members of the general population were included in the analysis, with respective disease durations of 10 and 8.9 years. Methotrexate was used along with b/tsDMARDs in 49% of patients with RA and 41% with PsA, and most patients were already on methotrexate when b/tsDMARDs were started. The tumor necrosis factor inhibitor etanercept (Enbrel) was the most commonly used b/tsDMARD in both RA and PsA, followed by infliximab (Remicade and biosimilars) and adalimumab (Humira and biosimilars).

The incidence of ILD within 5 years of starting a b/tsDMARD was 0.8% in patients with RA, 0.2% with PsA, and 0.1% in the general population, and these findings generated hazard ratios of 10.1 (95% confidence interval, 8.6-11.9) for RA and 5.0 (95% CI, 3.4-7.4) for PsA, compared with the general population as reference.

When the risk for ILD was explored according to methotrexate use in RA patients, “there was no signal of increased risk across patients using methotrexate,” Dr. Aarrestad Provan reported. When risk of ILD was explored according to b/tsDMARD use in RA patients, a signal of increased risk was observed with rituximab, she noted, “but upon adjusting for age, sex, and comorbidities, this association was no longer significant, but was still numerically increased.”

Iain McInnes, MD, PhD, vice principal, professor of rheumatology, and head of the College of Medical, Veterinary and Life Sciences at the University of Glasgow, remarked that he “loves results that are unexpected” and thanked the researcher for such an “important study.”

“For years, we’ve been interested in the potential for DMARDs to impact interstitial lung disease, with potential that drugs could make it worse, or better,” he said. “This study is wonderful and novel because first of all, there hasn’t, until now, been a direct comparison between RA and PsA in quite this way, and secondly, we haven’t really assessed whether there is a drug-related risk in PsA. Note that drug related does not necessarily imply causality.”

Regarding mechanisms, Dr. McInnes added that “epidemiologic studies suggest that PsA often coexists with the presence of cardiometabolic syndrome and obesity, which has a higher prevalence in PsA than in RA. Obesity is also related to ILD. As such, it begs the question of whether cardiometabolic, diabetes, or obesity-related features may give us a clue as to what is going on in these PsA patients.”

The research was supported by NordForsk and FOREUM. Dr. Aarrestad Provan reported serving as a consultant to Boehringer Ingelheim and Novartis and receiving grant/research support from Boehringer Ingelheim. Dr. McInnes declared no disclosures relevant to this study.

MILAN – Patients with psoriatic arthritis (PsA) who are using biologic and targeted synthetic disease-modifying antirheumatic drugs (b/tsDMARDs) have fivefold higher risk for interstitial lung disease (ILD) than does the general population, according to the first study to explore risk of ILD in this particular patient group.

The study also found 10-fold higher risk of ILD in patients with RA who were starting a b/tsDMARD, compared with the general population, while the addition of methotrexate did not appear to be associated with increased risk for ILD in either RA nor PsA.

Becky McCall/MDedge News

Sella Aarrestad Provan, MD, of the Center for Treatment of Rheumatic and Musculoskeletal Diseases at Diakonhjemmet Hospital, Oslo, presented the results at the annual European Congress of Rheumatology.

Explaining the motivation for the study, Dr. Aarrestad Provan said that, in RA, methotrexate’s role in ILD development remained unclear, while some small studies linked b/tsDMARDs with risk for ILD. “In PsA, very few studies have explored the risk of ILD, and no systematic studies have looked at ILD risk factors in this disease.”

The researchers analyzed patient data from hospital and death registries across five Nordic countries (Denmark, Norway, Finland, Iceland, and Sweden) and compared them with general population controls. They calculated risk ratios for people who developed ILD within 5 years of starting a b/tsDMARD (with or without methotrexate).

A total of 37,010 patients with RA, 12,341 with PsA, and 569,451 members of the general population were included in the analysis, with respective disease durations of 10 and 8.9 years. Methotrexate was used along with b/tsDMARDs in 49% of patients with RA and 41% with PsA, and most patients were already on methotrexate when b/tsDMARDs were started. The tumor necrosis factor inhibitor etanercept (Enbrel) was the most commonly used b/tsDMARD in both RA and PsA, followed by infliximab (Remicade and biosimilars) and adalimumab (Humira and biosimilars).

The incidence of ILD within 5 years of starting a b/tsDMARD was 0.8% in patients with RA, 0.2% with PsA, and 0.1% in the general population, and these findings generated hazard ratios of 10.1 (95% confidence interval, 8.6-11.9) for RA and 5.0 (95% CI, 3.4-7.4) for PsA, compared with the general population as reference.

When the risk for ILD was explored according to methotrexate use in RA patients, “there was no signal of increased risk across patients using methotrexate,” Dr. Aarrestad Provan reported. When risk of ILD was explored according to b/tsDMARD use in RA patients, a signal of increased risk was observed with rituximab, she noted, “but upon adjusting for age, sex, and comorbidities, this association was no longer significant, but was still numerically increased.”

Iain McInnes, MD, PhD, vice principal, professor of rheumatology, and head of the College of Medical, Veterinary and Life Sciences at the University of Glasgow, remarked that he “loves results that are unexpected” and thanked the researcher for such an “important study.”

“For years, we’ve been interested in the potential for DMARDs to impact interstitial lung disease, with potential that drugs could make it worse, or better,” he said. “This study is wonderful and novel because first of all, there hasn’t, until now, been a direct comparison between RA and PsA in quite this way, and secondly, we haven’t really assessed whether there is a drug-related risk in PsA. Note that drug related does not necessarily imply causality.”

Regarding mechanisms, Dr. McInnes added that “epidemiologic studies suggest that PsA often coexists with the presence of cardiometabolic syndrome and obesity, which has a higher prevalence in PsA than in RA. Obesity is also related to ILD. As such, it begs the question of whether cardiometabolic, diabetes, or obesity-related features may give us a clue as to what is going on in these PsA patients.”

The research was supported by NordForsk and FOREUM. Dr. Aarrestad Provan reported serving as a consultant to Boehringer Ingelheim and Novartis and receiving grant/research support from Boehringer Ingelheim. Dr. McInnes declared no disclosures relevant to this study.

MILAN – Patients with psoriatic arthritis (PsA) who are using biologic and targeted synthetic disease-modifying antirheumatic drugs (b/tsDMARDs) have fivefold higher risk for interstitial lung disease (ILD) than does the general population, according to the first study to explore risk of ILD in this particular patient group.

The study also found 10-fold higher risk of ILD in patients with RA who were starting a b/tsDMARD, compared with the general population, while the addition of methotrexate did not appear to be associated with increased risk for ILD in either RA nor PsA.

Becky McCall/MDedge News

Sella Aarrestad Provan, MD, of the Center for Treatment of Rheumatic and Musculoskeletal Diseases at Diakonhjemmet Hospital, Oslo, presented the results at the annual European Congress of Rheumatology.

Explaining the motivation for the study, Dr. Aarrestad Provan said that, in RA, methotrexate’s role in ILD development remained unclear, while some small studies linked b/tsDMARDs with risk for ILD. “In PsA, very few studies have explored the risk of ILD, and no systematic studies have looked at ILD risk factors in this disease.”

The researchers analyzed patient data from hospital and death registries across five Nordic countries (Denmark, Norway, Finland, Iceland, and Sweden) and compared them with general population controls. They calculated risk ratios for people who developed ILD within 5 years of starting a b/tsDMARD (with or without methotrexate).

A total of 37,010 patients with RA, 12,341 with PsA, and 569,451 members of the general population were included in the analysis, with respective disease durations of 10 and 8.9 years. Methotrexate was used along with b/tsDMARDs in 49% of patients with RA and 41% with PsA, and most patients were already on methotrexate when b/tsDMARDs were started. The tumor necrosis factor inhibitor etanercept (Enbrel) was the most commonly used b/tsDMARD in both RA and PsA, followed by infliximab (Remicade and biosimilars) and adalimumab (Humira and biosimilars).

The incidence of ILD within 5 years of starting a b/tsDMARD was 0.8% in patients with RA, 0.2% with PsA, and 0.1% in the general population, and these findings generated hazard ratios of 10.1 (95% confidence interval, 8.6-11.9) for RA and 5.0 (95% CI, 3.4-7.4) for PsA, compared with the general population as reference.

When the risk for ILD was explored according to methotrexate use in RA patients, “there was no signal of increased risk across patients using methotrexate,” Dr. Aarrestad Provan reported. When risk of ILD was explored according to b/tsDMARD use in RA patients, a signal of increased risk was observed with rituximab, she noted, “but upon adjusting for age, sex, and comorbidities, this association was no longer significant, but was still numerically increased.”

Iain McInnes, MD, PhD, vice principal, professor of rheumatology, and head of the College of Medical, Veterinary and Life Sciences at the University of Glasgow, remarked that he “loves results that are unexpected” and thanked the researcher for such an “important study.”

“For years, we’ve been interested in the potential for DMARDs to impact interstitial lung disease, with potential that drugs could make it worse, or better,” he said. “This study is wonderful and novel because first of all, there hasn’t, until now, been a direct comparison between RA and PsA in quite this way, and secondly, we haven’t really assessed whether there is a drug-related risk in PsA. Note that drug related does not necessarily imply causality.”

Regarding mechanisms, Dr. McInnes added that “epidemiologic studies suggest that PsA often coexists with the presence of cardiometabolic syndrome and obesity, which has a higher prevalence in PsA than in RA. Obesity is also related to ILD. As such, it begs the question of whether cardiometabolic, diabetes, or obesity-related features may give us a clue as to what is going on in these PsA patients.”

The research was supported by NordForsk and FOREUM. Dr. Aarrestad Provan reported serving as a consultant to Boehringer Ingelheim and Novartis and receiving grant/research support from Boehringer Ingelheim. Dr. McInnes declared no disclosures relevant to this study.

Even the plague wanted to visit Stonehenge

We’re about to blow your mind: The history you learned in school was often inaccurate. Shocking, we know, so we’ll give you a minute to process this incredible news.

Better? Good. Now, let’s look back at high school European history. The Black Death, specifically. The common narrative is that the Mongols, while besieging a Crimean city belonging to the Genoese, catapulted dead bodies infected with some mystery disease that turned out to be the plague. The Genoese then brought the plague back to Italy, and from there, we all know the rest of the story.

Ian Hodkinson, [email protected]

The Black Death was certainly extremely important to the development of modern Europe as we know it, but the history books gloss over the much longer history of the plague. Yersinia pestis did not suddenly appear unbidden in a Mongol war camp in 1347. The Black Death wasn’t even the first horrific, continent-wide pandemic caused by the plague; the Plague of Justinian 800 years earlier crippled the Byzantine Empire during an expansionist phase and killed anywhere between 15 million and 100 million.

Today, though, LOTME looks even deeper into history, nearly beyond even history itself, back into the depths of early Bronze Age northern Europe. Specifically, to two ancient burial sites in England, where researchers have identified three 4,000-year-old cases of Y. pestis, the first recorded incidence of the disease in Britain.

Two of the individuals, identified through analysis of dental pulp, were young children buried at a mass grave in Somerset, while the third, a middle-aged woman, was found in a ring cairn in Cumbria. These sites are hundreds of miles apart, yet carbon dating suggests all three people lived and died at roughly the same time. The strain found is very similar to other samples of plague found across central and western Europe starting around 3,000 BCE, suggesting a single, easily spread disease affecting a large area in a relatively small period of time. In other words, a pandemic. Even in these ancient times, the world was connected. Not even the island of Britain could escape.

Beyond that though, the research helps confirm the cyclical nature of the plague; over time, it loses its effectiveness and goes into hiding, only to mutate and come roaring back. This is a story with absolutely no relevance at all to the modern world. Nope, no plagues or pandemics going around right now, no viruses fading into the background in any way. What a ridiculous inference to make.
 

Uncovering the invisible with artificial intelligence

This week in “What Else Can AI Do?” new research shows that a computer program can reveal brain injury that couldn’t be seen before with typical MRI.

The hot new AI, birthed by researchers at New York University, could potentially be a game changer by linking repeated head impacts with tiny, structural changes in the brains of athletes who have not been diagnosed with a concussion. By using machine learning to train the AI, the researchers were, for the first time, able to distinguish the brain of athletes who played contact sports (football, soccer, lacrosse) from those participating in noncontact sports such as baseball, basketball, and cross-country.

Andrea Danti/Thinkstock

How did they do it? The investigators “designed statistical techniques that gave their computer program the ability to ‘learn’ how to predict exposure to repeated head impacts using mathematical models,” they explained in a written statement. Adding in data from the MRI scans of 81 male athletes with no known concussion diagnosis and the ability to identify unusual brain features between athletes with and without head trauma allowed the AI to predict results with accuracy even Miss Cleo would envy.

“This method may provide an important diagnostic tool not only for concussion, but also for detecting the damage that stems from subtler and more frequent head impacts,” said lead author Junbo Chen, an engineering doctoral candidate at NYU. That could make this new AI a valuable asset to science and medicine.

There are many things the human brain can do that AI can’t, and delegation could be one of them. Examining the data that represent the human brain in minute detail? Maybe we leave that to the machine.
 

Talk about your field promotions

If you’re a surgeon doing an amputation, the list of possible assistants pretty much starts and ends in only one place: Not the closest available janitor.

That may seem like an oddly obvious thing for us to say, but there’s at least one former Mainz (Germany) University Hospital physician who really needed to get this bit of advice before he attempted an unassisted toe amputation back in October of 2020. Yes, that does seem like kind of a long time ago for us to be reporting it now, but the details of the incident only just came to light a few days ago, thanks to German public broadcaster SWR.

Ente75/Wikipedia

Since it was just a toe, the surgeon thought he could perform the operation without any help. The toe, unfortunately, had other plans. The partially anesthetized patient got restless in the operating room, but with no actual trained nurse in the vicinity, the surgeon asked the closest available person – that would be the janitor – to lend a hand.

The surgical manager heard about these goings-on and got to the operating room too late to stop the procedure but soon enough to see the cleaning staffer “at the operating table with a bloody suction cup and a bloody compress in their hands,” SWR recently reported.

The incident was reported to the hospital’s medical director and the surgeon was fired, but since the patient experienced no complications not much fuss was made about it at the time.

Well, guess what? It’s toe-tally our job to make a fuss about these kinds of things. Or could it be that our job, much like the surgeon’s employment and the patient’s digit, is here toe-day and gone toe-morrow?

Even the plague wanted to visit Stonehenge

We’re about to blow your mind: The history you learned in school was often inaccurate. Shocking, we know, so we’ll give you a minute to process this incredible news.

Better? Good. Now, let’s look back at high school European history. The Black Death, specifically. The common narrative is that the Mongols, while besieging a Crimean city belonging to the Genoese, catapulted dead bodies infected with some mystery disease that turned out to be the plague. The Genoese then brought the plague back to Italy, and from there, we all know the rest of the story.

Ian Hodkinson, [email protected]

The Black Death was certainly extremely important to the development of modern Europe as we know it, but the history books gloss over the much longer history of the plague. Yersinia pestis did not suddenly appear unbidden in a Mongol war camp in 1347. The Black Death wasn’t even the first horrific, continent-wide pandemic caused by the plague; the Plague of Justinian 800 years earlier crippled the Byzantine Empire during an expansionist phase and killed anywhere between 15 million and 100 million.

Today, though, LOTME looks even deeper into history, nearly beyond even history itself, back into the depths of early Bronze Age northern Europe. Specifically, to two ancient burial sites in England, where researchers have identified three 4,000-year-old cases of Y. pestis, the first recorded incidence of the disease in Britain.

Two of the individuals, identified through analysis of dental pulp, were young children buried at a mass grave in Somerset, while the third, a middle-aged woman, was found in a ring cairn in Cumbria. These sites are hundreds of miles apart, yet carbon dating suggests all three people lived and died at roughly the same time. The strain found is very similar to other samples of plague found across central and western Europe starting around 3,000 BCE, suggesting a single, easily spread disease affecting a large area in a relatively small period of time. In other words, a pandemic. Even in these ancient times, the world was connected. Not even the island of Britain could escape.

Beyond that though, the research helps confirm the cyclical nature of the plague; over time, it loses its effectiveness and goes into hiding, only to mutate and come roaring back. This is a story with absolutely no relevance at all to the modern world. Nope, no plagues or pandemics going around right now, no viruses fading into the background in any way. What a ridiculous inference to make.
 

Uncovering the invisible with artificial intelligence

This week in “What Else Can AI Do?” new research shows that a computer program can reveal brain injury that couldn’t be seen before with typical MRI.

The hot new AI, birthed by researchers at New York University, could potentially be a game changer by linking repeated head impacts with tiny, structural changes in the brains of athletes who have not been diagnosed with a concussion. By using machine learning to train the AI, the researchers were, for the first time, able to distinguish the brain of athletes who played contact sports (football, soccer, lacrosse) from those participating in noncontact sports such as baseball, basketball, and cross-country.

Andrea Danti/Thinkstock

How did they do it? The investigators “designed statistical techniques that gave their computer program the ability to ‘learn’ how to predict exposure to repeated head impacts using mathematical models,” they explained in a written statement. Adding in data from the MRI scans of 81 male athletes with no known concussion diagnosis and the ability to identify unusual brain features between athletes with and without head trauma allowed the AI to predict results with accuracy even Miss Cleo would envy.

“This method may provide an important diagnostic tool not only for concussion, but also for detecting the damage that stems from subtler and more frequent head impacts,” said lead author Junbo Chen, an engineering doctoral candidate at NYU. That could make this new AI a valuable asset to science and medicine.

There are many things the human brain can do that AI can’t, and delegation could be one of them. Examining the data that represent the human brain in minute detail? Maybe we leave that to the machine.
 

Talk about your field promotions

If you’re a surgeon doing an amputation, the list of possible assistants pretty much starts and ends in only one place: Not the closest available janitor.

That may seem like an oddly obvious thing for us to say, but there’s at least one former Mainz (Germany) University Hospital physician who really needed to get this bit of advice before he attempted an unassisted toe amputation back in October of 2020. Yes, that does seem like kind of a long time ago for us to be reporting it now, but the details of the incident only just came to light a few days ago, thanks to German public broadcaster SWR.

Ente75/Wikipedia

Since it was just a toe, the surgeon thought he could perform the operation without any help. The toe, unfortunately, had other plans. The partially anesthetized patient got restless in the operating room, but with no actual trained nurse in the vicinity, the surgeon asked the closest available person – that would be the janitor – to lend a hand.

The surgical manager heard about these goings-on and got to the operating room too late to stop the procedure but soon enough to see the cleaning staffer “at the operating table with a bloody suction cup and a bloody compress in their hands,” SWR recently reported.

The incident was reported to the hospital’s medical director and the surgeon was fired, but since the patient experienced no complications not much fuss was made about it at the time.

Well, guess what? It’s toe-tally our job to make a fuss about these kinds of things. Or could it be that our job, much like the surgeon’s employment and the patient’s digit, is here toe-day and gone toe-morrow?

Even the plague wanted to visit Stonehenge

We’re about to blow your mind: The history you learned in school was often inaccurate. Shocking, we know, so we’ll give you a minute to process this incredible news.

Better? Good. Now, let’s look back at high school European history. The Black Death, specifically. The common narrative is that the Mongols, while besieging a Crimean city belonging to the Genoese, catapulted dead bodies infected with some mystery disease that turned out to be the plague. The Genoese then brought the plague back to Italy, and from there, we all know the rest of the story.

Ian Hodkinson, [email protected]

The Black Death was certainly extremely important to the development of modern Europe as we know it, but the history books gloss over the much longer history of the plague. Yersinia pestis did not suddenly appear unbidden in a Mongol war camp in 1347. The Black Death wasn’t even the first horrific, continent-wide pandemic caused by the plague; the Plague of Justinian 800 years earlier crippled the Byzantine Empire during an expansionist phase and killed anywhere between 15 million and 100 million.

Today, though, LOTME looks even deeper into history, nearly beyond even history itself, back into the depths of early Bronze Age northern Europe. Specifically, to two ancient burial sites in England, where researchers have identified three 4,000-year-old cases of Y. pestis, the first recorded incidence of the disease in Britain.

Two of the individuals, identified through analysis of dental pulp, were young children buried at a mass grave in Somerset, while the third, a middle-aged woman, was found in a ring cairn in Cumbria. These sites are hundreds of miles apart, yet carbon dating suggests all three people lived and died at roughly the same time. The strain found is very similar to other samples of plague found across central and western Europe starting around 3,000 BCE, suggesting a single, easily spread disease affecting a large area in a relatively small period of time. In other words, a pandemic. Even in these ancient times, the world was connected. Not even the island of Britain could escape.

Beyond that though, the research helps confirm the cyclical nature of the plague; over time, it loses its effectiveness and goes into hiding, only to mutate and come roaring back. This is a story with absolutely no relevance at all to the modern world. Nope, no plagues or pandemics going around right now, no viruses fading into the background in any way. What a ridiculous inference to make.
 

Uncovering the invisible with artificial intelligence

This week in “What Else Can AI Do?” new research shows that a computer program can reveal brain injury that couldn’t be seen before with typical MRI.

The hot new AI, birthed by researchers at New York University, could potentially be a game changer by linking repeated head impacts with tiny, structural changes in the brains of athletes who have not been diagnosed with a concussion. By using machine learning to train the AI, the researchers were, for the first time, able to distinguish the brain of athletes who played contact sports (football, soccer, lacrosse) from those participating in noncontact sports such as baseball, basketball, and cross-country.

Andrea Danti/Thinkstock

How did they do it? The investigators “designed statistical techniques that gave their computer program the ability to ‘learn’ how to predict exposure to repeated head impacts using mathematical models,” they explained in a written statement. Adding in data from the MRI scans of 81 male athletes with no known concussion diagnosis and the ability to identify unusual brain features between athletes with and without head trauma allowed the AI to predict results with accuracy even Miss Cleo would envy.

“This method may provide an important diagnostic tool not only for concussion, but also for detecting the damage that stems from subtler and more frequent head impacts,” said lead author Junbo Chen, an engineering doctoral candidate at NYU. That could make this new AI a valuable asset to science and medicine.

There are many things the human brain can do that AI can’t, and delegation could be one of them. Examining the data that represent the human brain in minute detail? Maybe we leave that to the machine.
 

Talk about your field promotions

If you’re a surgeon doing an amputation, the list of possible assistants pretty much starts and ends in only one place: Not the closest available janitor.

That may seem like an oddly obvious thing for us to say, but there’s at least one former Mainz (Germany) University Hospital physician who really needed to get this bit of advice before he attempted an unassisted toe amputation back in October of 2020. Yes, that does seem like kind of a long time ago for us to be reporting it now, but the details of the incident only just came to light a few days ago, thanks to German public broadcaster SWR.

Ente75/Wikipedia

Since it was just a toe, the surgeon thought he could perform the operation without any help. The toe, unfortunately, had other plans. The partially anesthetized patient got restless in the operating room, but with no actual trained nurse in the vicinity, the surgeon asked the closest available person – that would be the janitor – to lend a hand.

The surgical manager heard about these goings-on and got to the operating room too late to stop the procedure but soon enough to see the cleaning staffer “at the operating table with a bloody suction cup and a bloody compress in their hands,” SWR recently reported.

The incident was reported to the hospital’s medical director and the surgeon was fired, but since the patient experienced no complications not much fuss was made about it at the time.

Well, guess what? It’s toe-tally our job to make a fuss about these kinds of things. Or could it be that our job, much like the surgeon’s employment and the patient’s digit, is here toe-day and gone toe-morrow?

The Diagnosis: Actinic Prurigo

Actinic prurigo is an idiopathic photodermatosis triggered by UV exposure that primarily affects sun-exposed areas of the skin.^1,2 It typically presents as pruritic papules, plaques, and nodules, with most patients also experiencing oral tingling and pain.³ In more severe cases, it can progress to include conjunctival disease, scarring, and cheilitis.¹ A study of ocular findings among children with actinic pruritus reported that photophobia was one of the most important features,⁴ which was present in our patient. The face, especially over the zygomatic arches, nasal bridge, and lower lip, commonly is affected.1 Secondary lichenification or eczematization may occur.⁵ In our patient, the combination of conjunctivitis, cheilitis, and an eruption on sun-exposed skin were crucial in making the diagnosis.

Most cases present in patients younger than 10 years. It most commonly is seen in American Indians in North America, Central America, and South America.² After the diagnosis was considered in our patient, the family was asked about their ancestry and confirmed that both of the patient’s maternal and paternal grandparents were of American Indian descent. There also is a strong genetic component; the HLA-DR4 allele variant is present in 90% of cases, especially DRB1*0407, which is seen in 60% of cases.^1,6 In our patient, testing revealed HLA-DR4, DRB1*04 positivity. We further hypothesized that his mother’s photosensitive rash may have been actinic prurigo as opposed to polymorphous light eruption, which could explain the lack of response to hydroxychloroquine.

The diagnosis of actinic prurigo usually is made clinically. A skin biopsy typically is not necessary but would show hyperkeratosis, spongiosis, and acanthosis with a lymphocytic perivascular infiltrate. Biopsies of the lip classically show lymphoid germinal centers in the lamina propria, which can help distinguish actinic prurigo from polymorphous light eruption.¹

In our patient, the differential diagnosis included polymorphous light eruption, connective tissue disease such as lupus erythematosus or dermatomyositis, porphyria such as erythropoietic protoporphyria, and allergic contact dermatitis. Polymorphous light eruption was ruled out by the oral and ocular manifestations, which are not atypical for this diagnosis. The patient’s laboratory results displayed unremarkable antinuclear antibodies, creatine kinase, aldolase, and extractable nuclear antigens, which made connective tissue disease unlikely. Furthermore, a porphyria screen for total plasma porphyrins and whole blood protoporphyrin was negative, which helped rule out porphyria. Allergic contact dermatitis seemed less likely given the lack of improvement with topical steroids. Overall, the clinical presentation in a patient with relevant family ancestry and HLA-DR4 positivity supported a diagnosis of actinic prurigo.⁷

To manage the condition in our patient, strict photoprotection was recommended as well as the application of triamcinolone ointment 0.025% to the affected areas twice daily until the skin symptoms improved. For acute flares, other treatment considerations include topical tacrolimus, oral antihistamines, and oral corticosteroids. Some success has been reported with cyclosporine and azathioprine. For severe disease, thalidomide is the recommended treatment; it is effective in pediatric patients at dosages of 50 to 100 mg daily, but the dose has not yet been standardized for this age group.^8,9 Many adult patients initially are controlled with 100 to 200 mg daily, which can be tapered down to a dosage of 25 to 50 mg weekly with few adverse effects; however, the overall substantial side effects of thalidomide limit its use in both pediatric and adult populations.^1,2 Newer studies have suggested promising results with dupilumab, especially when actinic prurigo presents with high IgE levels or eosinophils on histology.^7,10 In our patient, the IgE level was normal.

The Diagnosis: Actinic Prurigo

Actinic prurigo is an idiopathic photodermatosis triggered by UV exposure that primarily affects sun-exposed areas of the skin.^1,2 It typically presents as pruritic papules, plaques, and nodules, with most patients also experiencing oral tingling and pain.³ In more severe cases, it can progress to include conjunctival disease, scarring, and cheilitis.¹ A study of ocular findings among children with actinic pruritus reported that photophobia was one of the most important features,⁴ which was present in our patient. The face, especially over the zygomatic arches, nasal bridge, and lower lip, commonly is affected.1 Secondary lichenification or eczematization may occur.⁵ In our patient, the combination of conjunctivitis, cheilitis, and an eruption on sun-exposed skin were crucial in making the diagnosis.

Most cases present in patients younger than 10 years. It most commonly is seen in American Indians in North America, Central America, and South America.² After the diagnosis was considered in our patient, the family was asked about their ancestry and confirmed that both of the patient’s maternal and paternal grandparents were of American Indian descent. There also is a strong genetic component; the HLA-DR4 allele variant is present in 90% of cases, especially DRB1*0407, which is seen in 60% of cases.^1,6 In our patient, testing revealed HLA-DR4, DRB1*04 positivity. We further hypothesized that his mother’s photosensitive rash may have been actinic prurigo as opposed to polymorphous light eruption, which could explain the lack of response to hydroxychloroquine.

The diagnosis of actinic prurigo usually is made clinically. A skin biopsy typically is not necessary but would show hyperkeratosis, spongiosis, and acanthosis with a lymphocytic perivascular infiltrate. Biopsies of the lip classically show lymphoid germinal centers in the lamina propria, which can help distinguish actinic prurigo from polymorphous light eruption.¹

In our patient, the differential diagnosis included polymorphous light eruption, connective tissue disease such as lupus erythematosus or dermatomyositis, porphyria such as erythropoietic protoporphyria, and allergic contact dermatitis. Polymorphous light eruption was ruled out by the oral and ocular manifestations, which are not atypical for this diagnosis. The patient’s laboratory results displayed unremarkable antinuclear antibodies, creatine kinase, aldolase, and extractable nuclear antigens, which made connective tissue disease unlikely. Furthermore, a porphyria screen for total plasma porphyrins and whole blood protoporphyrin was negative, which helped rule out porphyria. Allergic contact dermatitis seemed less likely given the lack of improvement with topical steroids. Overall, the clinical presentation in a patient with relevant family ancestry and HLA-DR4 positivity supported a diagnosis of actinic prurigo.⁷

To manage the condition in our patient, strict photoprotection was recommended as well as the application of triamcinolone ointment 0.025% to the affected areas twice daily until the skin symptoms improved. For acute flares, other treatment considerations include topical tacrolimus, oral antihistamines, and oral corticosteroids. Some success has been reported with cyclosporine and azathioprine. For severe disease, thalidomide is the recommended treatment; it is effective in pediatric patients at dosages of 50 to 100 mg daily, but the dose has not yet been standardized for this age group.^8,9 Many adult patients initially are controlled with 100 to 200 mg daily, which can be tapered down to a dosage of 25 to 50 mg weekly with few adverse effects; however, the overall substantial side effects of thalidomide limit its use in both pediatric and adult populations.^1,2 Newer studies have suggested promising results with dupilumab, especially when actinic prurigo presents with high IgE levels or eosinophils on histology.^7,10 In our patient, the IgE level was normal.

The Diagnosis: Actinic Prurigo

Actinic prurigo is an idiopathic photodermatosis triggered by UV exposure that primarily affects sun-exposed areas of the skin.^1,2 It typically presents as pruritic papules, plaques, and nodules, with most patients also experiencing oral tingling and pain.³ In more severe cases, it can progress to include conjunctival disease, scarring, and cheilitis.¹ A study of ocular findings among children with actinic pruritus reported that photophobia was one of the most important features,⁴ which was present in our patient. The face, especially over the zygomatic arches, nasal bridge, and lower lip, commonly is affected.1 Secondary lichenification or eczematization may occur.⁵ In our patient, the combination of conjunctivitis, cheilitis, and an eruption on sun-exposed skin were crucial in making the diagnosis.

Most cases present in patients younger than 10 years. It most commonly is seen in American Indians in North America, Central America, and South America.² After the diagnosis was considered in our patient, the family was asked about their ancestry and confirmed that both of the patient’s maternal and paternal grandparents were of American Indian descent. There also is a strong genetic component; the HLA-DR4 allele variant is present in 90% of cases, especially DRB1*0407, which is seen in 60% of cases.^1,6 In our patient, testing revealed HLA-DR4, DRB1*04 positivity. We further hypothesized that his mother’s photosensitive rash may have been actinic prurigo as opposed to polymorphous light eruption, which could explain the lack of response to hydroxychloroquine.

The diagnosis of actinic prurigo usually is made clinically. A skin biopsy typically is not necessary but would show hyperkeratosis, spongiosis, and acanthosis with a lymphocytic perivascular infiltrate. Biopsies of the lip classically show lymphoid germinal centers in the lamina propria, which can help distinguish actinic prurigo from polymorphous light eruption.¹

In our patient, the differential diagnosis included polymorphous light eruption, connective tissue disease such as lupus erythematosus or dermatomyositis, porphyria such as erythropoietic protoporphyria, and allergic contact dermatitis. Polymorphous light eruption was ruled out by the oral and ocular manifestations, which are not atypical for this diagnosis. The patient’s laboratory results displayed unremarkable antinuclear antibodies, creatine kinase, aldolase, and extractable nuclear antigens, which made connective tissue disease unlikely. Furthermore, a porphyria screen for total plasma porphyrins and whole blood protoporphyrin was negative, which helped rule out porphyria. Allergic contact dermatitis seemed less likely given the lack of improvement with topical steroids. Overall, the clinical presentation in a patient with relevant family ancestry and HLA-DR4 positivity supported a diagnosis of actinic prurigo.⁷

To manage the condition in our patient, strict photoprotection was recommended as well as the application of triamcinolone ointment 0.025% to the affected areas twice daily until the skin symptoms improved. For acute flares, other treatment considerations include topical tacrolimus, oral antihistamines, and oral corticosteroids. Some success has been reported with cyclosporine and azathioprine. For severe disease, thalidomide is the recommended treatment; it is effective in pediatric patients at dosages of 50 to 100 mg daily, but the dose has not yet been standardized for this age group.^8,9 Many adult patients initially are controlled with 100 to 200 mg daily, which can be tapered down to a dosage of 25 to 50 mg weekly with few adverse effects; however, the overall substantial side effects of thalidomide limit its use in both pediatric and adult populations.^1,2 Newer studies have suggested promising results with dupilumab, especially when actinic prurigo presents with high IgE levels or eosinophils on histology.^7,10 In our patient, the IgE level was normal.

The most common adverse events were acne, headache, upper respiratory tract infection, creatine phosphokinase (CPK) level elevations, and nasopharyngitis. I'm confident that none of my patients will have CPK elevations detected, because I won't be testing for it. I suspect that CPK elevations come from people being more physically active when their skin clears up.

I have the sense that our comfort with Janus kinase (JAK) inhibition will grow rapidly as we use the drug for patients with vitiligo, alopecia areata, resistant atopic dermatitis, and other diseases. Many of us are comfortable with methotrexate, dapsone, cyclosporine, and mycophenolate; our comfort with JAK inhibitors for our patients who need it will almost surely follow.

Williams and colleagues did a meta-analysis looking at the relationship between AD and rheumatoid arthritis (RA). They claim that “patients with AD had significantly increased odds of comorbid RA.” This claim should not be taken at face value. What they found was that the observed rate of RA was higher in patients with AD than in controls, and the difference was not something you would see by chance very often. But that does not make something significant. To truly be significant, you'd expect it to be clinically meaningful. The relationship they found — even if not due to chance or to some unmeasured bias — wasn't clinically relevant, in my opinion. RA is a relatively rare phenomenon. If it is barely more common in patients with AD than in controls, it is still rare in AD patients. We don't need to screen for RA in AD patients. We don't need to do anything with this apparent association.

The bottom line is to be wary when you see an article that reports a “significant” finding, especially when it is based on a higher relative risk, like an odds ratio. What we need to know is what the absolute magnitude of the risk is. We need to know how many patients with AD you'd have to see before you'd see one more case of RA due to AD. Williams and colleagues' study doesn't report the information we need as clinicians.

Fijan and colleagues did a meta-analysis to assess the effects of single-strain probiotic lactobacilli on atopic dermatitis. The found a “significant” (meaning, statistically significant) reduction with the lactobacilli treatment compared with placebo. They used the SCORing Atopic Dermatitis (SCORAD) index as the outcome. There was a mean 4.5-unit improvement.

For comparison, Wollenberg and colleagues¹ reported the SCORAD improvement seen with dupilumab: 49- and 46-unit improvements in children and adolescents, respectively.

While I'm sure that patients would love a safe, effective, “all natural” probiotic option for atopic dermatitis, I'm not optimistic that this gut magic is going to work.

Additional Reference

1. Wollenberg A, Marcoux D, Silverberg JI, et al. Dupilumab provides rapid and sustained improvement in SCORing Atopic Dermatitis outcomes in paediatric patients with atopic dermatitis. Acta Derm Venereol. 2022;102:adv00726. doi: 10.2340/actadv.v102.854

The most common adverse events were acne, headache, upper respiratory tract infection, creatine phosphokinase (CPK) level elevations, and nasopharyngitis. I'm confident that none of my patients will have CPK elevations detected, because I won't be testing for it. I suspect that CPK elevations come from people being more physically active when their skin clears up.

I have the sense that our comfort with Janus kinase (JAK) inhibition will grow rapidly as we use the drug for patients with vitiligo, alopecia areata, resistant atopic dermatitis, and other diseases. Many of us are comfortable with methotrexate, dapsone, cyclosporine, and mycophenolate; our comfort with JAK inhibitors for our patients who need it will almost surely follow.

Williams and colleagues did a meta-analysis looking at the relationship between AD and rheumatoid arthritis (RA). They claim that “patients with AD had significantly increased odds of comorbid RA.” This claim should not be taken at face value. What they found was that the observed rate of RA was higher in patients with AD than in controls, and the difference was not something you would see by chance very often. But that does not make something significant. To truly be significant, you'd expect it to be clinically meaningful. The relationship they found — even if not due to chance or to some unmeasured bias — wasn't clinically relevant, in my opinion. RA is a relatively rare phenomenon. If it is barely more common in patients with AD than in controls, it is still rare in AD patients. We don't need to screen for RA in AD patients. We don't need to do anything with this apparent association.

The bottom line is to be wary when you see an article that reports a “significant” finding, especially when it is based on a higher relative risk, like an odds ratio. What we need to know is what the absolute magnitude of the risk is. We need to know how many patients with AD you'd have to see before you'd see one more case of RA due to AD. Williams and colleagues' study doesn't report the information we need as clinicians.

Fijan and colleagues did a meta-analysis to assess the effects of single-strain probiotic lactobacilli on atopic dermatitis. The found a “significant” (meaning, statistically significant) reduction with the lactobacilli treatment compared with placebo. They used the SCORing Atopic Dermatitis (SCORAD) index as the outcome. There was a mean 4.5-unit improvement.

For comparison, Wollenberg and colleagues¹ reported the SCORAD improvement seen with dupilumab: 49- and 46-unit improvements in children and adolescents, respectively.

While I'm sure that patients would love a safe, effective, “all natural” probiotic option for atopic dermatitis, I'm not optimistic that this gut magic is going to work.

Additional Reference

1. Wollenberg A, Marcoux D, Silverberg JI, et al. Dupilumab provides rapid and sustained improvement in SCORing Atopic Dermatitis outcomes in paediatric patients with atopic dermatitis. Acta Derm Venereol. 2022;102:adv00726. doi: 10.2340/actadv.v102.854

The most common adverse events were acne, headache, upper respiratory tract infection, creatine phosphokinase (CPK) level elevations, and nasopharyngitis. I'm confident that none of my patients will have CPK elevations detected, because I won't be testing for it. I suspect that CPK elevations come from people being more physically active when their skin clears up.

I have the sense that our comfort with Janus kinase (JAK) inhibition will grow rapidly as we use the drug for patients with vitiligo, alopecia areata, resistant atopic dermatitis, and other diseases. Many of us are comfortable with methotrexate, dapsone, cyclosporine, and mycophenolate; our comfort with JAK inhibitors for our patients who need it will almost surely follow.

Williams and colleagues did a meta-analysis looking at the relationship between AD and rheumatoid arthritis (RA). They claim that “patients with AD had significantly increased odds of comorbid RA.” This claim should not be taken at face value. What they found was that the observed rate of RA was higher in patients with AD than in controls, and the difference was not something you would see by chance very often. But that does not make something significant. To truly be significant, you'd expect it to be clinically meaningful. The relationship they found — even if not due to chance or to some unmeasured bias — wasn't clinically relevant, in my opinion. RA is a relatively rare phenomenon. If it is barely more common in patients with AD than in controls, it is still rare in AD patients. We don't need to screen for RA in AD patients. We don't need to do anything with this apparent association.

The bottom line is to be wary when you see an article that reports a “significant” finding, especially when it is based on a higher relative risk, like an odds ratio. What we need to know is what the absolute magnitude of the risk is. We need to know how many patients with AD you'd have to see before you'd see one more case of RA due to AD. Williams and colleagues' study doesn't report the information we need as clinicians.

Fijan and colleagues did a meta-analysis to assess the effects of single-strain probiotic lactobacilli on atopic dermatitis. The found a “significant” (meaning, statistically significant) reduction with the lactobacilli treatment compared with placebo. They used the SCORing Atopic Dermatitis (SCORAD) index as the outcome. There was a mean 4.5-unit improvement.

For comparison, Wollenberg and colleagues¹ reported the SCORAD improvement seen with dupilumab: 49- and 46-unit improvements in children and adolescents, respectively.

While I'm sure that patients would love a safe, effective, “all natural” probiotic option for atopic dermatitis, I'm not optimistic that this gut magic is going to work.

Additional Reference

1. Wollenberg A, Marcoux D, Silverberg JI, et al. Dupilumab provides rapid and sustained improvement in SCORing Atopic Dermatitis outcomes in paediatric patients with atopic dermatitis. Acta Derm Venereol. 2022;102:adv00726. doi: 10.2340/actadv.v102.854