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AGA Clinical Practice Update: Functional gastrointestinal symptoms in patients with inflammatory bowel disease
When patients with inflammatory bowel disease report persistent gastrointestinal symptoms, clinicians should perform a thorough clinical assessment and then take a stepwise approach to rule out ongoing inflammation, according to a clinical practice update from the American Gastroenterological Association.
A fecal calprotectin test can be useful because values under 50 mcg/mL may suggest endoscopic remission, which may, in turn, point to another etiology of gastrointestinal symptoms, wrote Jean-Frederic Colombel, MD, of the Icahn School of Medicine at Mount Sinai, New York, together with his associates in Clinical Gastroenterology and Hepatology.
However, a result between 50 and 250 mcg/mL is harder to interpret because the upper limit of normal varies and mild increases can occur secondary to nonspecific low-grade inflammation, according to the experts. For mild gastrointestinal symptoms, they suggested testing fecal calprotectin every 3-6 months to identify flares as early as possible. If a flare is suspected, they advised considering cross-sectional imaging or endoscopy with biopsy.
Imaging also is indicated for patients with obstructive symptoms such as abdominal pain, obstipation, or constipation, the practice update states. Such symptoms can indicate fecal stasis proximal to distal colitis in patients with ulcerative colitis, or intestinal stenosis in patients with Crohn’s disease.
Other pathophysiologies of gastrointestinal symptoms also should be considered based on constellations of symptoms. For example, steatorrhea with chronic abdominal pain may indicate pancreatic exocrine insufficiency, which fecal elastase testing can help confirm. Symptoms of diarrhea-predominant irritable bowel syndrome can result from bile acid diarrhea, for which several screening tests are available. Diarrhea, abdominal pain, and bloating may indicate carbohydrate malabsorption or small-intestinal bacterial overgrowth, which can be evaluated with breath testing.
If patients with inflammatory bowel disease have persistent gastrointestinal symptoms but lack objective evidence of ongoing inflammation or another etiology, then clinicians should increase their suspicion of an overlapping functional gastrointestinal disorder. These conditions actually “share many common pathophysiologic disturbances that, in some inflammatory bowel disease patients, may be a consequence of prior structural and functional bowel damage,” the experts wrote.
For patients with chronic constipation who do not have an underlying obstruction, they suggest osmotic or stimulant laxatives. For chronic diarrhea, they recommend hypomobility agents or bile-acid sequestrants. Patients with fecal symptoms of irritable bowel syndrome also should be evaluated for pelvic floor disorders, which may improve with biofeedback therapy, the experts state.
A low-FODMAP diet (a diet low in lactose, fermentable oligosaccharides, disaccharides, monosaccharides, and polyols) also can improve symptoms of irritable bowel syndrome, including patients with inflammatory bowel disease. However, a dietitian always should deliver this restrictive diet because patients with inflammatory bowel disease already are at increased risk for undernutrition.
Patients with functional gastrointestinal pain may benefit from antispasmodics, neuropathic-directed agents, and antidepressants, but they should not receive opiates, the experts emphasized. Anxiety and depression are common in both inflammatory bowel disease and irritable bowel syndrome, and patients may benefit from psychotherapy (cognitive-behavioral therapy, hypnotherapy, and mindfulness therapy), antidepressants, anxiolytics, or combinations of these treatments. The practice update also recommends physical exercise, which has been shown to decrease the risk of recurrent active disease in the setting of inflammatory bowel disease.
Finally, persistent gut symptoms can indicate intestinal barrier dysfunction, even if endoscopy shows mucosal healing. Barrier dysfunction is a potential therapeutic target that needs further study in this setting, the experts noted. They also called for studies of the potential benefits and risks of probiotics and other alternative approaches, such as herbal treatments and supplements, yoga, acupuncture, and moxibustion. Until further evidence, however, they have recommended against complementary or alternative medicine or fecal microbiota transplantation.
Dr. Colombel has served as consultant, advisory board member, or speaker for AbbVie, Amgen, Boehringer-Ingelheim, Celgene Corporation, and many other pharmaceutical companies. He has received research grants from AbbVie, Takeda, and Janssen and Janssen.
SOURCE: Colombel J-F et al. Clin Gastroenterol Hepatol. 2018 Aug 9. doi: 10.1016/j.cgh.2018.08.001.
When patients with inflammatory bowel disease report persistent gastrointestinal symptoms, clinicians should perform a thorough clinical assessment and then take a stepwise approach to rule out ongoing inflammation, according to a clinical practice update from the American Gastroenterological Association.
A fecal calprotectin test can be useful because values under 50 mcg/mL may suggest endoscopic remission, which may, in turn, point to another etiology of gastrointestinal symptoms, wrote Jean-Frederic Colombel, MD, of the Icahn School of Medicine at Mount Sinai, New York, together with his associates in Clinical Gastroenterology and Hepatology.
However, a result between 50 and 250 mcg/mL is harder to interpret because the upper limit of normal varies and mild increases can occur secondary to nonspecific low-grade inflammation, according to the experts. For mild gastrointestinal symptoms, they suggested testing fecal calprotectin every 3-6 months to identify flares as early as possible. If a flare is suspected, they advised considering cross-sectional imaging or endoscopy with biopsy.
Imaging also is indicated for patients with obstructive symptoms such as abdominal pain, obstipation, or constipation, the practice update states. Such symptoms can indicate fecal stasis proximal to distal colitis in patients with ulcerative colitis, or intestinal stenosis in patients with Crohn’s disease.
Other pathophysiologies of gastrointestinal symptoms also should be considered based on constellations of symptoms. For example, steatorrhea with chronic abdominal pain may indicate pancreatic exocrine insufficiency, which fecal elastase testing can help confirm. Symptoms of diarrhea-predominant irritable bowel syndrome can result from bile acid diarrhea, for which several screening tests are available. Diarrhea, abdominal pain, and bloating may indicate carbohydrate malabsorption or small-intestinal bacterial overgrowth, which can be evaluated with breath testing.
If patients with inflammatory bowel disease have persistent gastrointestinal symptoms but lack objective evidence of ongoing inflammation or another etiology, then clinicians should increase their suspicion of an overlapping functional gastrointestinal disorder. These conditions actually “share many common pathophysiologic disturbances that, in some inflammatory bowel disease patients, may be a consequence of prior structural and functional bowel damage,” the experts wrote.
For patients with chronic constipation who do not have an underlying obstruction, they suggest osmotic or stimulant laxatives. For chronic diarrhea, they recommend hypomobility agents or bile-acid sequestrants. Patients with fecal symptoms of irritable bowel syndrome also should be evaluated for pelvic floor disorders, which may improve with biofeedback therapy, the experts state.
A low-FODMAP diet (a diet low in lactose, fermentable oligosaccharides, disaccharides, monosaccharides, and polyols) also can improve symptoms of irritable bowel syndrome, including patients with inflammatory bowel disease. However, a dietitian always should deliver this restrictive diet because patients with inflammatory bowel disease already are at increased risk for undernutrition.
Patients with functional gastrointestinal pain may benefit from antispasmodics, neuropathic-directed agents, and antidepressants, but they should not receive opiates, the experts emphasized. Anxiety and depression are common in both inflammatory bowel disease and irritable bowel syndrome, and patients may benefit from psychotherapy (cognitive-behavioral therapy, hypnotherapy, and mindfulness therapy), antidepressants, anxiolytics, or combinations of these treatments. The practice update also recommends physical exercise, which has been shown to decrease the risk of recurrent active disease in the setting of inflammatory bowel disease.
Finally, persistent gut symptoms can indicate intestinal barrier dysfunction, even if endoscopy shows mucosal healing. Barrier dysfunction is a potential therapeutic target that needs further study in this setting, the experts noted. They also called for studies of the potential benefits and risks of probiotics and other alternative approaches, such as herbal treatments and supplements, yoga, acupuncture, and moxibustion. Until further evidence, however, they have recommended against complementary or alternative medicine or fecal microbiota transplantation.
Dr. Colombel has served as consultant, advisory board member, or speaker for AbbVie, Amgen, Boehringer-Ingelheim, Celgene Corporation, and many other pharmaceutical companies. He has received research grants from AbbVie, Takeda, and Janssen and Janssen.
SOURCE: Colombel J-F et al. Clin Gastroenterol Hepatol. 2018 Aug 9. doi: 10.1016/j.cgh.2018.08.001.
When patients with inflammatory bowel disease report persistent gastrointestinal symptoms, clinicians should perform a thorough clinical assessment and then take a stepwise approach to rule out ongoing inflammation, according to a clinical practice update from the American Gastroenterological Association.
A fecal calprotectin test can be useful because values under 50 mcg/mL may suggest endoscopic remission, which may, in turn, point to another etiology of gastrointestinal symptoms, wrote Jean-Frederic Colombel, MD, of the Icahn School of Medicine at Mount Sinai, New York, together with his associates in Clinical Gastroenterology and Hepatology.
However, a result between 50 and 250 mcg/mL is harder to interpret because the upper limit of normal varies and mild increases can occur secondary to nonspecific low-grade inflammation, according to the experts. For mild gastrointestinal symptoms, they suggested testing fecal calprotectin every 3-6 months to identify flares as early as possible. If a flare is suspected, they advised considering cross-sectional imaging or endoscopy with biopsy.
Imaging also is indicated for patients with obstructive symptoms such as abdominal pain, obstipation, or constipation, the practice update states. Such symptoms can indicate fecal stasis proximal to distal colitis in patients with ulcerative colitis, or intestinal stenosis in patients with Crohn’s disease.
Other pathophysiologies of gastrointestinal symptoms also should be considered based on constellations of symptoms. For example, steatorrhea with chronic abdominal pain may indicate pancreatic exocrine insufficiency, which fecal elastase testing can help confirm. Symptoms of diarrhea-predominant irritable bowel syndrome can result from bile acid diarrhea, for which several screening tests are available. Diarrhea, abdominal pain, and bloating may indicate carbohydrate malabsorption or small-intestinal bacterial overgrowth, which can be evaluated with breath testing.
If patients with inflammatory bowel disease have persistent gastrointestinal symptoms but lack objective evidence of ongoing inflammation or another etiology, then clinicians should increase their suspicion of an overlapping functional gastrointestinal disorder. These conditions actually “share many common pathophysiologic disturbances that, in some inflammatory bowel disease patients, may be a consequence of prior structural and functional bowel damage,” the experts wrote.
For patients with chronic constipation who do not have an underlying obstruction, they suggest osmotic or stimulant laxatives. For chronic diarrhea, they recommend hypomobility agents or bile-acid sequestrants. Patients with fecal symptoms of irritable bowel syndrome also should be evaluated for pelvic floor disorders, which may improve with biofeedback therapy, the experts state.
A low-FODMAP diet (a diet low in lactose, fermentable oligosaccharides, disaccharides, monosaccharides, and polyols) also can improve symptoms of irritable bowel syndrome, including patients with inflammatory bowel disease. However, a dietitian always should deliver this restrictive diet because patients with inflammatory bowel disease already are at increased risk for undernutrition.
Patients with functional gastrointestinal pain may benefit from antispasmodics, neuropathic-directed agents, and antidepressants, but they should not receive opiates, the experts emphasized. Anxiety and depression are common in both inflammatory bowel disease and irritable bowel syndrome, and patients may benefit from psychotherapy (cognitive-behavioral therapy, hypnotherapy, and mindfulness therapy), antidepressants, anxiolytics, or combinations of these treatments. The practice update also recommends physical exercise, which has been shown to decrease the risk of recurrent active disease in the setting of inflammatory bowel disease.
Finally, persistent gut symptoms can indicate intestinal barrier dysfunction, even if endoscopy shows mucosal healing. Barrier dysfunction is a potential therapeutic target that needs further study in this setting, the experts noted. They also called for studies of the potential benefits and risks of probiotics and other alternative approaches, such as herbal treatments and supplements, yoga, acupuncture, and moxibustion. Until further evidence, however, they have recommended against complementary or alternative medicine or fecal microbiota transplantation.
Dr. Colombel has served as consultant, advisory board member, or speaker for AbbVie, Amgen, Boehringer-Ingelheim, Celgene Corporation, and many other pharmaceutical companies. He has received research grants from AbbVie, Takeda, and Janssen and Janssen.
SOURCE: Colombel J-F et al. Clin Gastroenterol Hepatol. 2018 Aug 9. doi: 10.1016/j.cgh.2018.08.001.
FROM CLINICAL GASTROENTEROLOGY AND HEPATOLOGY
AGA Guideline: Treatment of mild to moderate ulcerative colitis
For patients with extensive mild to moderate ulcerative colitis, numerous randomized controlled trials support the use of either standard-dose mesalamine (2-3 grams per day) or diazo-bonded 5-aminosalicylic acid (ASA) instead of low-dose mesalamine, sulfasalazine, or no therapy, state new guidelines from the American Gastroenterological Association, published in Gastroenterology.
Sulfasalazine (2-4 grams per day) is less likely to be tolerated but remains a “reasonable option” for remitted patients who are already on it and for patients with prominent arthritis symptoms, especially if alternative treatments are cost prohibitive, wrote Cynthia W. Ko, MD, MS, of the University of Washington, Seattle, and her associates.
According to the guideline, patients with mild to moderate ulcerative colitis have less than four to six bowel movements per day, only mild or moderate rectal bleeding, no constitutional symptoms, and no high overall inflammatory burden or signs of high inflammatory activity on the Mayo Clinic score and Truelove and Witt’s criteria. These patients usually do not require colectomy, but this outcome is more likely when patients are diagnosed before age 40 years or have extensive disease or deep ulcers, extraintestinal manifestations, or elevated inflammatory markers. These higher-risk patients need more aggressive initial treatment and faster treatment intensification in cases of inadequate response, the guideline emphasizes. Even for cases of mild to moderate ulcerative colitis, treatment intensification is preferable to repeated courses of corticosteroids.
The guideline recommends adding rectal mesalamine to oral 5-ASA if patients have extensive or left-sided mild to moderate ulcerative colitis. In randomized controlled trials, this combination was significantly more likely to induce and maintain remission than was standard-dose oral mesalamine monotherapy, the authors noted. “In the maintenance trials, enemas were used twice per week or for 1 week per month. Both oral and topical mesalamine were well tolerated.”
For patients with moderate disease activity or a suboptimal response to standard-dose mesalamine or diazo-bonded 5-ASA, the guideline recommends adding rectal mesalamine to high-dose oral mesalamine (more than 3 grams daily). Combination therapy maximizes the delivery of mesalamine to the affected area of the colon, which optimizes the trial of 5-ASA before opting for treatment escalation, the authors noted. They recommend once-daily oral mesalamine dosing, since this is easier to adhere to and studies have found no benefit of more frequent dosing.
For inducing remission of mild to moderate ulcerative colitis, the guideline recommends standard-dose oral mesalamine or diazo-bonded 5-ASA over budesonide. “Overall, the budesonide preparations are not superior to mesalamine for induction of remission,” the authors wrote. Oral 5-ASAs are preferred, especially given the absence of data on the efficacy or safety of maintenance budesonide therapy.
For patients with mild to moderate ulcerative proctosigmoiditis or proctitis, the guideline conditionally recommends rectal mesalamine over oral mesalamine. Compared with placebo, rectal mesalamine suppositories were significantly more likely to induce remission in randomized trials of patients with mild to moderate ulcerative proctitis. If these patients cannot tolerate or are refractory to mesalamine suppositories, low-quality evidence supports rectal steroid therapy over no treatment, the guideline states. For patients with mild to moderate ulcerative proctosigmoiditis, moderate-quality evidence supports mesalamine enemas over rectal corticosteroids. If these patients want to avoid the difficulties of enemas, the guideline considers rectal corticosteroid foam a reasonable alternative.
Likewise, they cite low-quality evidence for adding oral prednisone or budesonide MMX to 5-ASA if patients are refractory to optimized 5-ASA therapy. No trials have directly compared rates of remission with budesonide MMX versus systemic corticosteroids. In just one placebo-controlled trial, adding budesonide MMX to 5-ASA slightly improved the chances of remission (risk ratio, 0.95; 95% confidence interval, 0.89-1.00). Furthermore, studies of other second-generation corticosteroids found they were better tolerated but no more likely to induce remission than oral prednisone or prednisolone.
Some patients with mild to moderate colitis respond inadequately to these recommended therapies and need systemic corticosteroids, immunomodulators, or biologic therapies to induce and maintain remission, the guideline authors noted. They make no recommendation on immunomodulators or biologics. Studies of probiotics, curcumin, and fecal microbiota transplantation are “urgently needed,” but for now, their use “risks delaying proven effective therapy, with the potential for worsening symptoms or complications,” they wrote. For patients without Clostridium difficile infections, they recommend against fecal microbiota transplantation except in the setting of a clinical trial.
The experts also noted the need for a tool to stratify patients with mild to moderate ulcerative colitis based on their risk of future progression and colectomy.
Finally, they call for studies on who will benefit most from high-dose mesalamine or topical mesalamine and on the relative safety and efficacy of budesonide and systemic corticosteroids in the event of an inadequate response to 5-ASAs.
All members were required to complete the disclosure statement. These statements are maintained at the American Gastroenterological Association headquarters in Bethesda, Maryland, and pertinent disclosures of conflict of interest are published with this report.
SOURCE: Crocket SD et al. Gastro 2019;156(2). doi: org/10.1053/j.gastro.2018.12.009.
For patients with extensive mild to moderate ulcerative colitis, numerous randomized controlled trials support the use of either standard-dose mesalamine (2-3 grams per day) or diazo-bonded 5-aminosalicylic acid (ASA) instead of low-dose mesalamine, sulfasalazine, or no therapy, state new guidelines from the American Gastroenterological Association, published in Gastroenterology.
Sulfasalazine (2-4 grams per day) is less likely to be tolerated but remains a “reasonable option” for remitted patients who are already on it and for patients with prominent arthritis symptoms, especially if alternative treatments are cost prohibitive, wrote Cynthia W. Ko, MD, MS, of the University of Washington, Seattle, and her associates.
According to the guideline, patients with mild to moderate ulcerative colitis have less than four to six bowel movements per day, only mild or moderate rectal bleeding, no constitutional symptoms, and no high overall inflammatory burden or signs of high inflammatory activity on the Mayo Clinic score and Truelove and Witt’s criteria. These patients usually do not require colectomy, but this outcome is more likely when patients are diagnosed before age 40 years or have extensive disease or deep ulcers, extraintestinal manifestations, or elevated inflammatory markers. These higher-risk patients need more aggressive initial treatment and faster treatment intensification in cases of inadequate response, the guideline emphasizes. Even for cases of mild to moderate ulcerative colitis, treatment intensification is preferable to repeated courses of corticosteroids.
The guideline recommends adding rectal mesalamine to oral 5-ASA if patients have extensive or left-sided mild to moderate ulcerative colitis. In randomized controlled trials, this combination was significantly more likely to induce and maintain remission than was standard-dose oral mesalamine monotherapy, the authors noted. “In the maintenance trials, enemas were used twice per week or for 1 week per month. Both oral and topical mesalamine were well tolerated.”
For patients with moderate disease activity or a suboptimal response to standard-dose mesalamine or diazo-bonded 5-ASA, the guideline recommends adding rectal mesalamine to high-dose oral mesalamine (more than 3 grams daily). Combination therapy maximizes the delivery of mesalamine to the affected area of the colon, which optimizes the trial of 5-ASA before opting for treatment escalation, the authors noted. They recommend once-daily oral mesalamine dosing, since this is easier to adhere to and studies have found no benefit of more frequent dosing.
For inducing remission of mild to moderate ulcerative colitis, the guideline recommends standard-dose oral mesalamine or diazo-bonded 5-ASA over budesonide. “Overall, the budesonide preparations are not superior to mesalamine for induction of remission,” the authors wrote. Oral 5-ASAs are preferred, especially given the absence of data on the efficacy or safety of maintenance budesonide therapy.
For patients with mild to moderate ulcerative proctosigmoiditis or proctitis, the guideline conditionally recommends rectal mesalamine over oral mesalamine. Compared with placebo, rectal mesalamine suppositories were significantly more likely to induce remission in randomized trials of patients with mild to moderate ulcerative proctitis. If these patients cannot tolerate or are refractory to mesalamine suppositories, low-quality evidence supports rectal steroid therapy over no treatment, the guideline states. For patients with mild to moderate ulcerative proctosigmoiditis, moderate-quality evidence supports mesalamine enemas over rectal corticosteroids. If these patients want to avoid the difficulties of enemas, the guideline considers rectal corticosteroid foam a reasonable alternative.
Likewise, they cite low-quality evidence for adding oral prednisone or budesonide MMX to 5-ASA if patients are refractory to optimized 5-ASA therapy. No trials have directly compared rates of remission with budesonide MMX versus systemic corticosteroids. In just one placebo-controlled trial, adding budesonide MMX to 5-ASA slightly improved the chances of remission (risk ratio, 0.95; 95% confidence interval, 0.89-1.00). Furthermore, studies of other second-generation corticosteroids found they were better tolerated but no more likely to induce remission than oral prednisone or prednisolone.
Some patients with mild to moderate colitis respond inadequately to these recommended therapies and need systemic corticosteroids, immunomodulators, or biologic therapies to induce and maintain remission, the guideline authors noted. They make no recommendation on immunomodulators or biologics. Studies of probiotics, curcumin, and fecal microbiota transplantation are “urgently needed,” but for now, their use “risks delaying proven effective therapy, with the potential for worsening symptoms or complications,” they wrote. For patients without Clostridium difficile infections, they recommend against fecal microbiota transplantation except in the setting of a clinical trial.
The experts also noted the need for a tool to stratify patients with mild to moderate ulcerative colitis based on their risk of future progression and colectomy.
Finally, they call for studies on who will benefit most from high-dose mesalamine or topical mesalamine and on the relative safety and efficacy of budesonide and systemic corticosteroids in the event of an inadequate response to 5-ASAs.
All members were required to complete the disclosure statement. These statements are maintained at the American Gastroenterological Association headquarters in Bethesda, Maryland, and pertinent disclosures of conflict of interest are published with this report.
SOURCE: Crocket SD et al. Gastro 2019;156(2). doi: org/10.1053/j.gastro.2018.12.009.
For patients with extensive mild to moderate ulcerative colitis, numerous randomized controlled trials support the use of either standard-dose mesalamine (2-3 grams per day) or diazo-bonded 5-aminosalicylic acid (ASA) instead of low-dose mesalamine, sulfasalazine, or no therapy, state new guidelines from the American Gastroenterological Association, published in Gastroenterology.
Sulfasalazine (2-4 grams per day) is less likely to be tolerated but remains a “reasonable option” for remitted patients who are already on it and for patients with prominent arthritis symptoms, especially if alternative treatments are cost prohibitive, wrote Cynthia W. Ko, MD, MS, of the University of Washington, Seattle, and her associates.
According to the guideline, patients with mild to moderate ulcerative colitis have less than four to six bowel movements per day, only mild or moderate rectal bleeding, no constitutional symptoms, and no high overall inflammatory burden or signs of high inflammatory activity on the Mayo Clinic score and Truelove and Witt’s criteria. These patients usually do not require colectomy, but this outcome is more likely when patients are diagnosed before age 40 years or have extensive disease or deep ulcers, extraintestinal manifestations, or elevated inflammatory markers. These higher-risk patients need more aggressive initial treatment and faster treatment intensification in cases of inadequate response, the guideline emphasizes. Even for cases of mild to moderate ulcerative colitis, treatment intensification is preferable to repeated courses of corticosteroids.
The guideline recommends adding rectal mesalamine to oral 5-ASA if patients have extensive or left-sided mild to moderate ulcerative colitis. In randomized controlled trials, this combination was significantly more likely to induce and maintain remission than was standard-dose oral mesalamine monotherapy, the authors noted. “In the maintenance trials, enemas were used twice per week or for 1 week per month. Both oral and topical mesalamine were well tolerated.”
For patients with moderate disease activity or a suboptimal response to standard-dose mesalamine or diazo-bonded 5-ASA, the guideline recommends adding rectal mesalamine to high-dose oral mesalamine (more than 3 grams daily). Combination therapy maximizes the delivery of mesalamine to the affected area of the colon, which optimizes the trial of 5-ASA before opting for treatment escalation, the authors noted. They recommend once-daily oral mesalamine dosing, since this is easier to adhere to and studies have found no benefit of more frequent dosing.
For inducing remission of mild to moderate ulcerative colitis, the guideline recommends standard-dose oral mesalamine or diazo-bonded 5-ASA over budesonide. “Overall, the budesonide preparations are not superior to mesalamine for induction of remission,” the authors wrote. Oral 5-ASAs are preferred, especially given the absence of data on the efficacy or safety of maintenance budesonide therapy.
For patients with mild to moderate ulcerative proctosigmoiditis or proctitis, the guideline conditionally recommends rectal mesalamine over oral mesalamine. Compared with placebo, rectal mesalamine suppositories were significantly more likely to induce remission in randomized trials of patients with mild to moderate ulcerative proctitis. If these patients cannot tolerate or are refractory to mesalamine suppositories, low-quality evidence supports rectal steroid therapy over no treatment, the guideline states. For patients with mild to moderate ulcerative proctosigmoiditis, moderate-quality evidence supports mesalamine enemas over rectal corticosteroids. If these patients want to avoid the difficulties of enemas, the guideline considers rectal corticosteroid foam a reasonable alternative.
Likewise, they cite low-quality evidence for adding oral prednisone or budesonide MMX to 5-ASA if patients are refractory to optimized 5-ASA therapy. No trials have directly compared rates of remission with budesonide MMX versus systemic corticosteroids. In just one placebo-controlled trial, adding budesonide MMX to 5-ASA slightly improved the chances of remission (risk ratio, 0.95; 95% confidence interval, 0.89-1.00). Furthermore, studies of other second-generation corticosteroids found they were better tolerated but no more likely to induce remission than oral prednisone or prednisolone.
Some patients with mild to moderate colitis respond inadequately to these recommended therapies and need systemic corticosteroids, immunomodulators, or biologic therapies to induce and maintain remission, the guideline authors noted. They make no recommendation on immunomodulators or biologics. Studies of probiotics, curcumin, and fecal microbiota transplantation are “urgently needed,” but for now, their use “risks delaying proven effective therapy, with the potential for worsening symptoms or complications,” they wrote. For patients without Clostridium difficile infections, they recommend against fecal microbiota transplantation except in the setting of a clinical trial.
The experts also noted the need for a tool to stratify patients with mild to moderate ulcerative colitis based on their risk of future progression and colectomy.
Finally, they call for studies on who will benefit most from high-dose mesalamine or topical mesalamine and on the relative safety and efficacy of budesonide and systemic corticosteroids in the event of an inadequate response to 5-ASAs.
All members were required to complete the disclosure statement. These statements are maintained at the American Gastroenterological Association headquarters in Bethesda, Maryland, and pertinent disclosures of conflict of interest are published with this report.
SOURCE: Crocket SD et al. Gastro 2019;156(2). doi: org/10.1053/j.gastro.2018.12.009.
FROM GASTROENTEROLOGY
NIH announces new clinical trial assessing FMT for recurrent CDAD
A clinical trial has begun which will examine whether fecal microbiota transplantation (FMT) by enema is safe and can prevent recurrent Clostridium difficile–associated disease (CDAD), according to a press release from the National Institutes of Health.
CDAD is normally treated with antibiotics such as vancomycin or fidaxomicin; however, it recurs in about 20% of people who receive this treatment. FMT is effective at curing patients with recurring C. diff infections, but long-term safety and a standardized process have yet to be established.
An estimated 162 people aged 18 years or older who have had two or more episodes of CDAD within the previous 6 months will be included in the clinical trial. These patients will be split into two groups: The first will receive an antidiarrheal medication and an FMT delivered by retention enema; the second will receive an antidiarrheal and a placebo colored to look like an active stool sample.
All patients will provide stool and blood samples at designated time points for 1 year after they undergo treatment for CDAD. Stool samples will be examined for gut microbial diversity changes and infectious pathogens; blood samples will be examined for metabolic syndrome markers.
“Clostridium difficile–associated disease, a significant problem in health care facilities, causes an estimated 15,000 deaths in the United States each year. This randomized, controlled trial aims to provide critical data on the efficacy and long-term safety of using fecal microbiota transplants by enema to cure C. diff infections,” NIAID director Anthony S. Fauci, MD, said in the press release.
The full trial page can be found at Clinicaltrials.gov.
A clinical trial has begun which will examine whether fecal microbiota transplantation (FMT) by enema is safe and can prevent recurrent Clostridium difficile–associated disease (CDAD), according to a press release from the National Institutes of Health.
CDAD is normally treated with antibiotics such as vancomycin or fidaxomicin; however, it recurs in about 20% of people who receive this treatment. FMT is effective at curing patients with recurring C. diff infections, but long-term safety and a standardized process have yet to be established.
An estimated 162 people aged 18 years or older who have had two or more episodes of CDAD within the previous 6 months will be included in the clinical trial. These patients will be split into two groups: The first will receive an antidiarrheal medication and an FMT delivered by retention enema; the second will receive an antidiarrheal and a placebo colored to look like an active stool sample.
All patients will provide stool and blood samples at designated time points for 1 year after they undergo treatment for CDAD. Stool samples will be examined for gut microbial diversity changes and infectious pathogens; blood samples will be examined for metabolic syndrome markers.
“Clostridium difficile–associated disease, a significant problem in health care facilities, causes an estimated 15,000 deaths in the United States each year. This randomized, controlled trial aims to provide critical data on the efficacy and long-term safety of using fecal microbiota transplants by enema to cure C. diff infections,” NIAID director Anthony S. Fauci, MD, said in the press release.
The full trial page can be found at Clinicaltrials.gov.
A clinical trial has begun which will examine whether fecal microbiota transplantation (FMT) by enema is safe and can prevent recurrent Clostridium difficile–associated disease (CDAD), according to a press release from the National Institutes of Health.
CDAD is normally treated with antibiotics such as vancomycin or fidaxomicin; however, it recurs in about 20% of people who receive this treatment. FMT is effective at curing patients with recurring C. diff infections, but long-term safety and a standardized process have yet to be established.
An estimated 162 people aged 18 years or older who have had two or more episodes of CDAD within the previous 6 months will be included in the clinical trial. These patients will be split into two groups: The first will receive an antidiarrheal medication and an FMT delivered by retention enema; the second will receive an antidiarrheal and a placebo colored to look like an active stool sample.
All patients will provide stool and blood samples at designated time points for 1 year after they undergo treatment for CDAD. Stool samples will be examined for gut microbial diversity changes and infectious pathogens; blood samples will be examined for metabolic syndrome markers.
“Clostridium difficile–associated disease, a significant problem in health care facilities, causes an estimated 15,000 deaths in the United States each year. This randomized, controlled trial aims to provide critical data on the efficacy and long-term safety of using fecal microbiota transplants by enema to cure C. diff infections,” NIAID director Anthony S. Fauci, MD, said in the press release.
The full trial page can be found at Clinicaltrials.gov.
Anaerobically prepared donor FMT led to steroid-free remission of ulcerative colitis
For patients with mild to moderate ulcerative colitis, a three-dose, 1-week induction course of anaerobically prepared donor fecal microbiota transplantation (FMT) produced steroid-free remission in 32% of patients, compared with 9% of those who received autologous aerobically prepared FMT in a randomized, double-blind, clinical trial.
Eight weeks after FMT, the odds of steroid-free remission were fivefold higher with anaerobically prepared donor versus aerobically prepared autologous FMT (odds ratio, 5; 95% confidence interval, 1.2-20.1; P = .03), reported Samuel P. Costello, MD, of the Queen Elizabeth Hospital in Woodville, Australia, and his associates. Donor FMT also significantly increased the likelihood of clinical remission and clinical response, the researchers said. “Further research is needed to assess longer-term maintenance of remission and safety,” they wrote in JAMA.
In prior studies, high-intensity FMT with aerobically prepared donor material remitted some cases of mild to moderate ulcerative colitis. However, anaerobic processing has been found to improve microbial viability, which might allow patients to remit with less intensive FMT, the researchers wrote. In their multicenter study, 73 adults with mildly to moderately active ulcerative colitis (total Mayo score, 3-10 points, with endoscopic subscore of at least 2) received either anaerobically prepared stool pooled from three to four highly screened donors or aerobically processed autologous stool. Patients in both arms received two enemas in the 7 days after FMT – a less dose-intensive treatment protocol than in prior FMT trials of patients with ulcerative colitis.
Among 38 patients in the intervention group, 12 (32%) achieved remission, defined as total Mayo score no greater than 2 with an endoscopic score no greater than 1. Strikingly, five (42%) of these patients remained in remission at 12 months, the researchers said. Additionally, 55% of the intervention group but only 23% of the comparator group (P = .007) achieved clinical response at 8 weeks, defined as at least a 3-point decrease in total Mayo score. Rates of clinical remission (Simple Colitis Activity Index score no greater than 2) were 47% and 17%, respectively (P = .01).
The study population averaged 39 years of age, 45% were women, and 95% completed the trial. Serious adverse events included one case each of worsening colitis, Clostridium difficile colitis requiring colectomy, and pneumonia in the donor FMT group, and two cases of worsening colitis in the comparator group. However, the study “was not powered to assess safety, and and thus further larger studies are required to assess this,” the researchers said. The study also suffered from a significant loss to follow-up at 12 months, so additional studies should assess long-term remission, they added.
The National Health and Medical Research Council and the Gutsy Foundation provided funding. Dr. Costello disclosed ties to Janssen, Shire, Ferring, Microbiotica, and Pfizer.
SOURCE: Costello SP et al. JAMA. 2019;321(2):156-64. doi: 10.1001/jama.2018.20046.
This is the fourth randomized clinical trial of fecal microbiota transplantation (FMT) in ulcerative colitis, and despite their differing methodologies, all four trials reported remission rates of 24%-32%, wrote Colleen R. Kelly, MD, and Ashwin N. Ananthakrishnan, MD, in an editorial accompanying the study.
Using pooled stool from multiple donors increases bacterial diversity and the likelihood that the sample will include a donor with optimal bacterial composition in the stool, the experts said. Based on studies to date, this approach works in about one-third of patients with ulcerative colitis, which resembles the rate of efficacy of systemic immunosuppression. Thus, FMT is likely to work best in combination with therapies such as immunomodulators and biologics, which target underlying immune dysregulation, they said.
Large multicenter trials are needed to answer questions on mechanism of action, optimal patient population and delivery methods, durability, and the use of FMT monotherapy versus combination regimens in patients with mild or severe ulcerative colitis, the experts wrote. “Finally, regulatory agencies must provide a reasonable pathway for approval of microbial-based therapeutics,” they added. “[The] therapeutic manipulation of the intestinal microbiota, whether by full-spectrum FMT or a more targeted approach using synthetic cultured consortia of bacterial species, is likely to be a component of therapy for [inflammatory bowel disease] and others in the not-so-distant future.”
Dr. Kelly is with Brown University in Providence, R.I. She disclosed ties to Finch Therapeutics and Openbiome. Dr. Ananthakrishnan is with Harvard Medical School, Boston. He disclosed ties to Pfizer and Gilead (JAMA. 2019;321[2]:151-2).
This is the fourth randomized clinical trial of fecal microbiota transplantation (FMT) in ulcerative colitis, and despite their differing methodologies, all four trials reported remission rates of 24%-32%, wrote Colleen R. Kelly, MD, and Ashwin N. Ananthakrishnan, MD, in an editorial accompanying the study.
Using pooled stool from multiple donors increases bacterial diversity and the likelihood that the sample will include a donor with optimal bacterial composition in the stool, the experts said. Based on studies to date, this approach works in about one-third of patients with ulcerative colitis, which resembles the rate of efficacy of systemic immunosuppression. Thus, FMT is likely to work best in combination with therapies such as immunomodulators and biologics, which target underlying immune dysregulation, they said.
Large multicenter trials are needed to answer questions on mechanism of action, optimal patient population and delivery methods, durability, and the use of FMT monotherapy versus combination regimens in patients with mild or severe ulcerative colitis, the experts wrote. “Finally, regulatory agencies must provide a reasonable pathway for approval of microbial-based therapeutics,” they added. “[The] therapeutic manipulation of the intestinal microbiota, whether by full-spectrum FMT or a more targeted approach using synthetic cultured consortia of bacterial species, is likely to be a component of therapy for [inflammatory bowel disease] and others in the not-so-distant future.”
Dr. Kelly is with Brown University in Providence, R.I. She disclosed ties to Finch Therapeutics and Openbiome. Dr. Ananthakrishnan is with Harvard Medical School, Boston. He disclosed ties to Pfizer and Gilead (JAMA. 2019;321[2]:151-2).
This is the fourth randomized clinical trial of fecal microbiota transplantation (FMT) in ulcerative colitis, and despite their differing methodologies, all four trials reported remission rates of 24%-32%, wrote Colleen R. Kelly, MD, and Ashwin N. Ananthakrishnan, MD, in an editorial accompanying the study.
Using pooled stool from multiple donors increases bacterial diversity and the likelihood that the sample will include a donor with optimal bacterial composition in the stool, the experts said. Based on studies to date, this approach works in about one-third of patients with ulcerative colitis, which resembles the rate of efficacy of systemic immunosuppression. Thus, FMT is likely to work best in combination with therapies such as immunomodulators and biologics, which target underlying immune dysregulation, they said.
Large multicenter trials are needed to answer questions on mechanism of action, optimal patient population and delivery methods, durability, and the use of FMT monotherapy versus combination regimens in patients with mild or severe ulcerative colitis, the experts wrote. “Finally, regulatory agencies must provide a reasonable pathway for approval of microbial-based therapeutics,” they added. “[The] therapeutic manipulation of the intestinal microbiota, whether by full-spectrum FMT or a more targeted approach using synthetic cultured consortia of bacterial species, is likely to be a component of therapy for [inflammatory bowel disease] and others in the not-so-distant future.”
Dr. Kelly is with Brown University in Providence, R.I. She disclosed ties to Finch Therapeutics and Openbiome. Dr. Ananthakrishnan is with Harvard Medical School, Boston. He disclosed ties to Pfizer and Gilead (JAMA. 2019;321[2]:151-2).
For patients with mild to moderate ulcerative colitis, a three-dose, 1-week induction course of anaerobically prepared donor fecal microbiota transplantation (FMT) produced steroid-free remission in 32% of patients, compared with 9% of those who received autologous aerobically prepared FMT in a randomized, double-blind, clinical trial.
Eight weeks after FMT, the odds of steroid-free remission were fivefold higher with anaerobically prepared donor versus aerobically prepared autologous FMT (odds ratio, 5; 95% confidence interval, 1.2-20.1; P = .03), reported Samuel P. Costello, MD, of the Queen Elizabeth Hospital in Woodville, Australia, and his associates. Donor FMT also significantly increased the likelihood of clinical remission and clinical response, the researchers said. “Further research is needed to assess longer-term maintenance of remission and safety,” they wrote in JAMA.
In prior studies, high-intensity FMT with aerobically prepared donor material remitted some cases of mild to moderate ulcerative colitis. However, anaerobic processing has been found to improve microbial viability, which might allow patients to remit with less intensive FMT, the researchers wrote. In their multicenter study, 73 adults with mildly to moderately active ulcerative colitis (total Mayo score, 3-10 points, with endoscopic subscore of at least 2) received either anaerobically prepared stool pooled from three to four highly screened donors or aerobically processed autologous stool. Patients in both arms received two enemas in the 7 days after FMT – a less dose-intensive treatment protocol than in prior FMT trials of patients with ulcerative colitis.
Among 38 patients in the intervention group, 12 (32%) achieved remission, defined as total Mayo score no greater than 2 with an endoscopic score no greater than 1. Strikingly, five (42%) of these patients remained in remission at 12 months, the researchers said. Additionally, 55% of the intervention group but only 23% of the comparator group (P = .007) achieved clinical response at 8 weeks, defined as at least a 3-point decrease in total Mayo score. Rates of clinical remission (Simple Colitis Activity Index score no greater than 2) were 47% and 17%, respectively (P = .01).
The study population averaged 39 years of age, 45% were women, and 95% completed the trial. Serious adverse events included one case each of worsening colitis, Clostridium difficile colitis requiring colectomy, and pneumonia in the donor FMT group, and two cases of worsening colitis in the comparator group. However, the study “was not powered to assess safety, and and thus further larger studies are required to assess this,” the researchers said. The study also suffered from a significant loss to follow-up at 12 months, so additional studies should assess long-term remission, they added.
The National Health and Medical Research Council and the Gutsy Foundation provided funding. Dr. Costello disclosed ties to Janssen, Shire, Ferring, Microbiotica, and Pfizer.
SOURCE: Costello SP et al. JAMA. 2019;321(2):156-64. doi: 10.1001/jama.2018.20046.
For patients with mild to moderate ulcerative colitis, a three-dose, 1-week induction course of anaerobically prepared donor fecal microbiota transplantation (FMT) produced steroid-free remission in 32% of patients, compared with 9% of those who received autologous aerobically prepared FMT in a randomized, double-blind, clinical trial.
Eight weeks after FMT, the odds of steroid-free remission were fivefold higher with anaerobically prepared donor versus aerobically prepared autologous FMT (odds ratio, 5; 95% confidence interval, 1.2-20.1; P = .03), reported Samuel P. Costello, MD, of the Queen Elizabeth Hospital in Woodville, Australia, and his associates. Donor FMT also significantly increased the likelihood of clinical remission and clinical response, the researchers said. “Further research is needed to assess longer-term maintenance of remission and safety,” they wrote in JAMA.
In prior studies, high-intensity FMT with aerobically prepared donor material remitted some cases of mild to moderate ulcerative colitis. However, anaerobic processing has been found to improve microbial viability, which might allow patients to remit with less intensive FMT, the researchers wrote. In their multicenter study, 73 adults with mildly to moderately active ulcerative colitis (total Mayo score, 3-10 points, with endoscopic subscore of at least 2) received either anaerobically prepared stool pooled from three to four highly screened donors or aerobically processed autologous stool. Patients in both arms received two enemas in the 7 days after FMT – a less dose-intensive treatment protocol than in prior FMT trials of patients with ulcerative colitis.
Among 38 patients in the intervention group, 12 (32%) achieved remission, defined as total Mayo score no greater than 2 with an endoscopic score no greater than 1. Strikingly, five (42%) of these patients remained in remission at 12 months, the researchers said. Additionally, 55% of the intervention group but only 23% of the comparator group (P = .007) achieved clinical response at 8 weeks, defined as at least a 3-point decrease in total Mayo score. Rates of clinical remission (Simple Colitis Activity Index score no greater than 2) were 47% and 17%, respectively (P = .01).
The study population averaged 39 years of age, 45% were women, and 95% completed the trial. Serious adverse events included one case each of worsening colitis, Clostridium difficile colitis requiring colectomy, and pneumonia in the donor FMT group, and two cases of worsening colitis in the comparator group. However, the study “was not powered to assess safety, and and thus further larger studies are required to assess this,” the researchers said. The study also suffered from a significant loss to follow-up at 12 months, so additional studies should assess long-term remission, they added.
The National Health and Medical Research Council and the Gutsy Foundation provided funding. Dr. Costello disclosed ties to Janssen, Shire, Ferring, Microbiotica, and Pfizer.
SOURCE: Costello SP et al. JAMA. 2019;321(2):156-64. doi: 10.1001/jama.2018.20046.
FROM JAMA
Key clinical point: Anaerobically prepared donor fecal microbiota transplantation (FMT) significantly increased the likelihood of steroid-free remission, compared with autologous FMT in patients with mild to moderately active ulcerative colitis.
Major finding: Eight weeks after FMT, 32% of the donor group achieved steroid-free remission, compared with 9% of the autologous FMT group (odds ratio, 5; P = .03).
Study details: Randomized, double-blind, multicenter trial of 73 patients with mild to moderate ulcerative colitis.
Disclosures: The National Health and Medical Research Council and the Gutsy Foundation provided funding. Dr. Costello disclosed ties to Janssen, Shire, Ferring, Microbiotica, and Pfizer.
Source: Costello SP et al. JAMA. 2019;321(2):156-64.
Dietary aluminum may trigger IBS
Aluminum ingested in small amounts causes visceral hypersensitivity in rats, suggesting that dietary levels of aluminum may trigger irritable bowel syndrome (IBS) in humans, according to a study published in Cellular and Molecular Gastroenterology and Hepatology.
Rats given oral aluminum exhibited dose-dependent visceral pain along with activation of proteinase-activated receptor-2 (PAR2) and mast cell degranulation, a combination of events that mirror clinical signs and molecular mechanisms of IBS in humans, reported lead author, Nicolas Esquerre, PhD, of Lille Inflammation Research International Center at Université Lille in France, and his colleagues. The study contributes to ongoing research surrounding causes and mechanisms of IBS, which may vary among patients because of disease subsets. These findings suggest that some patients with IBS may benefit from dietary aluminum restriction or chelation therapy.
“[T]he question of the initial trigger [of IBS] still remains unresolved,” the investigators wrote. “A more precise link between food and IBS has been demonstrated for gluten and other wheat proteins, lactose, and nickel, highlighting particular subsets of IBS patients now diagnosed as nonceliac gluten/wheat sensitivity, lactose intolerance, and nickel-allergic contact mucositis,” they added. “Here, we evaluated the effect of aluminum, a common contaminant of food and water, on abdominal pain.”
Aluminum may enter the diet as a food additive, or it may contaminate foods grown in aluminum-rich soil. Other sources of oral exposure include packaging and kitchenware. A previous study showed that most Americans ingest 0.01-1.4 mg/kg of aluminum daily, and 5% ingest 1.58 mg/kg daily (i.e., 95 mg per day for a 60-kg person).
Based on these statistics, rats in the present study received oral aluminum citrate (AlCi) corresponding with three doses of aluminum: 0.5 mg/kg, 1.5 mg/kg, or 3.0 mg/kg. Treatment continued for 30 days, with colorectal distension (CRD) measured on days 2, 4, 8, 15, and 30.
Results showed a dose-dependent relationship between aluminum ingestion and visceral hypersensitivity. Within 2 days, rats receiving 3.0 mg/kg of aluminum exhibited a significantly lower pain threshold, and within 8 days, rats receiving 0.5 mg/kg and 1.5 mg/kg also showed increased visceral hypersensitivity.
After 1 month of treatment, rats receiving 1.5 mg/kg per day demonstrated a 30% increase in pain compared with control animals. In the same group, visceral hypersensitivity began to wane 7 days after cessation of treatment; 4 more weeks were needed to return to baseline. When treatment was restarted, visceral hypersensitivity occurred within 2 days, compared with 8 days upon initial administration. These findings are particularly relevant to some people, as the 1.5-mg/kg dose corresponds with the daily amount of aluminum ingested by 5% of Americans. Similar patterns of response and sensitization were observed in rats ingesting 0.5 mg/kg and 3.0 mg/kg. Female rats were more sensitive to aluminum than were male rats, a sex pattern that mimics human IBS.
Further testing showed that rats treated with zinc citrate (ZnCi) did not exhibit changes to pain threshold, thereby excluding citrate as an aggravating factor. Rat models of noninflammatory and inflammatory colonic hypersensitivity (butyrate enema or intrathecal injection of 25%-50% ethanol in combination with 2,4,6-trinitrobenzenesulfonic acid, respectively) had visceral hypersensitivity similar to that of rats in the 1.5-mg/kg AlCi group.
Testing of colonic tissue from AlCi-treated rats did not reveal inflammatory changes according to a variety of qualifiers, including histology, myeloperoxidase activity, mRNA expression of several inflammatory cytokines, or infiltration of eosinophils or macrophages. Noninflammatory effects of aluminum, however, were found. For instance, treated rats had lower serotonin levels in enteroendocrine cells.
“Enteroendocrine cells are specialized epithelial cells that respond to luminal stimuli by releasing various biologically active compounds,” the investigators wrote. “They regulate several physiological and homeostatic functions of the gastrointestinal tract, such as postprandial secretion, motility, immune responses, and sensory functions. A reduced number of enteroendocrine cells has been observed in the duodenum, ileum, and colon of some patients with IBS.”
In addition to changes in enteroendocrine cells, AlCi-treated rats had greater colonic mast cell degranulation and histamine with upregulation of histidine decarboxylase transcripts, suggesting that aluminum activated mast cells.
To determine the role of mast cell activation in visceral hypersensitivity, rats were given AlCi with cromoglycate, an inhibitor of mast cell degranulation. This treatment reduced mast cell degranulation and visceral pain threshold, compared with AlCi-treated rats not receiving cromoglycate, suggesting that mast cell degranulation is a primary driver of visceral hypersensitivity. This observation was confirmed by a mast cell–deficient mouse strain (Kit W-sh/W-sh), that had a normal number of mast cells incapable of degranulation. Treating the mast cell–deficient mice with AlCi did not induce visceral hypersensitivity, thereby confirming the role of mast cell degranulation.
Along with mast cell degranulation, AlCi treatment led to PAR2 activation. Investigators explored the significance of this finding with PAR2 knockout mice. When treated with AlCi, PAR2 knockout mice showed no increase in visceral hypersensitivity, suggesting that hypersensitivity is dependent on PAR2 activation. Further testing revealed that mast cell–deficient mice (Kit W-sh/W-sh) did not have PAR2 upregulation either, connecting a sequence in which aluminum triggers mast cell degranulation, mast cell degranulation drives PAR2 upregulation, and PAR2 upregulation causes visceral hypersensitivity. The latter two events in this chain – mast cell degranulation and PAR2 upregulation – mirror molecular mechanisms of IBS in humans.
“We speculate that aluminum activates mast cells to release mediators that can increase excitability of nociceptive afferences contributing to the visceral pain phenotype,” the investigators wrote. “Taken together, our results linked aluminum to several mechanisms implicated in IBS pathophysiology, highlighting a possible role for aluminum as a triggering factor in IBS development.”
The investigators suggested that these findings could influence preventive or therapeutic strategies: “Aluminum might be the first identified dietary risk factor for IBS, implying that measures to limit aluminum dietary consumption or to chelate aluminum may represent novel pathways of prevention and treatment of IBS in some susceptible patients,” they wrote.
The study was funded by the European Fund for Regional Economic Development; the Hauts de France Region, Ministère de l’Enseignement Supérieur et de la Recherche (CPER IRENI); and Digestscience (European Research Foundation on Intestinal Diseases and Nutrition).
SOURCE: Esquerre N et al. Cell Mol Gastroenterol Hepatol. 2019 Sep 20. doi: 10.1016/j.jcmgh.2018.09.012.
Irritable bowel syndrome is a chronic functional gastrointestinal disorder, characterized by relapsing/remitting diarrhea, constipation, and visceral pain. IBS afflicts 10%-25% of the population in developed countries. 
Despite histologically normal intestinal biopsy specimens, biological signatures of IBS include alterations in intestinal gene expression, increased gut permeability, and changes in gut microbiota composition. Thus, although the cause or causes of IBS are not defined, these and other data highlight the enormous breadth of factors that might play a role in this disorder. Similar alterations also are associated with inflammatory bowel disease (IBD), although the magnitude of changes is typically greater in IBD. Nevertheless, these data suggest that IBS and IBD may share triggers and pathogenetic mechanisms. That prevalence of both IBS and IBD have shown marked increases in incidence, roughly paralleling the modernization of society that accelerated in the mid-20th century, raises the possibility that environmental factors associated with human activity may be a driver of both diseases. Recent findings suggest that aluminum may be one such trigger. While humans have always been exposed to aluminum, the most abundant metal on earth, industrialization has increased the magnitude of exposure owing to the use of aluminum salts as stabilizers in processed foods and the concentration of ground water aluminum in agricultural products. Mimicking estimated average human ingestion of aluminum via administering it orally to rats increases their perception of visceral pain. These results suggest a possible role for increased exposure to aluminum in driving the post–mid-20th-century increased incidence of IBS. Unfortunately, only broad societal estimates of aluminum exposure are available, and aluminum levels are difficult to measure in individuals, making it difficult to epidemiologically investigate the role of aluminum in promoting GI disease in humans. Hence, I submit that levels of aluminum ingestion by humans should be more closely monitored and the potential of aluminum to promote GI disease carefully scrutinized.
Andrew Ted Gewirtz, PhD, distinguished university center professor, Georgia State University’s Institute for Biomedical Sciences’ Center for Inflammation, Immunity and Infection, Atlanta.
Irritable bowel syndrome is a chronic functional gastrointestinal disorder, characterized by relapsing/remitting diarrhea, constipation, and visceral pain. IBS afflicts 10%-25% of the population in developed countries.
Despite histologically normal intestinal biopsy specimens, biological signatures of IBS include alterations in intestinal gene expression, increased gut permeability, and changes in gut microbiota composition. Thus, although the cause or causes of IBS are not defined, these and other data highlight the enormous breadth of factors that might play a role in this disorder. Similar alterations also are associated with inflammatory bowel disease (IBD), although the magnitude of changes is typically greater in IBD. Nevertheless, these data suggest that IBS and IBD may share triggers and pathogenetic mechanisms. That prevalence of both IBS and IBD have shown marked increases in incidence, roughly paralleling the modernization of society that accelerated in the mid-20th century, raises the possibility that environmental factors associated with human activity may be a driver of both diseases. Recent findings suggest that aluminum may be one such trigger. While humans have always been exposed to aluminum, the most abundant metal on earth, industrialization has increased the magnitude of exposure owing to the use of aluminum salts as stabilizers in processed foods and the concentration of ground water aluminum in agricultural products. Mimicking estimated average human ingestion of aluminum via administering it orally to rats increases their perception of visceral pain. These results suggest a possible role for increased exposure to aluminum in driving the post–mid-20th-century increased incidence of IBS. Unfortunately, only broad societal estimates of aluminum exposure are available, and aluminum levels are difficult to measure in individuals, making it difficult to epidemiologically investigate the role of aluminum in promoting GI disease in humans. Hence, I submit that levels of aluminum ingestion by humans should be more closely monitored and the potential of aluminum to promote GI disease carefully scrutinized.
Andrew Ted Gewirtz, PhD, distinguished university center professor, Georgia State University’s Institute for Biomedical Sciences’ Center for Inflammation, Immunity and Infection, Atlanta.
Irritable bowel syndrome is a chronic functional gastrointestinal disorder, characterized by relapsing/remitting diarrhea, constipation, and visceral pain. IBS afflicts 10%-25% of the population in developed countries.
Despite histologically normal intestinal biopsy specimens, biological signatures of IBS include alterations in intestinal gene expression, increased gut permeability, and changes in gut microbiota composition. Thus, although the cause or causes of IBS are not defined, these and other data highlight the enormous breadth of factors that might play a role in this disorder. Similar alterations also are associated with inflammatory bowel disease (IBD), although the magnitude of changes is typically greater in IBD. Nevertheless, these data suggest that IBS and IBD may share triggers and pathogenetic mechanisms. That prevalence of both IBS and IBD have shown marked increases in incidence, roughly paralleling the modernization of society that accelerated in the mid-20th century, raises the possibility that environmental factors associated with human activity may be a driver of both diseases. Recent findings suggest that aluminum may be one such trigger. While humans have always been exposed to aluminum, the most abundant metal on earth, industrialization has increased the magnitude of exposure owing to the use of aluminum salts as stabilizers in processed foods and the concentration of ground water aluminum in agricultural products. Mimicking estimated average human ingestion of aluminum via administering it orally to rats increases their perception of visceral pain. These results suggest a possible role for increased exposure to aluminum in driving the post–mid-20th-century increased incidence of IBS. Unfortunately, only broad societal estimates of aluminum exposure are available, and aluminum levels are difficult to measure in individuals, making it difficult to epidemiologically investigate the role of aluminum in promoting GI disease in humans. Hence, I submit that levels of aluminum ingestion by humans should be more closely monitored and the potential of aluminum to promote GI disease carefully scrutinized.
Andrew Ted Gewirtz, PhD, distinguished university center professor, Georgia State University’s Institute for Biomedical Sciences’ Center for Inflammation, Immunity and Infection, Atlanta.
Aluminum ingested in small amounts causes visceral hypersensitivity in rats, suggesting that dietary levels of aluminum may trigger irritable bowel syndrome (IBS) in humans, according to a study published in Cellular and Molecular Gastroenterology and Hepatology.
Rats given oral aluminum exhibited dose-dependent visceral pain along with activation of proteinase-activated receptor-2 (PAR2) and mast cell degranulation, a combination of events that mirror clinical signs and molecular mechanisms of IBS in humans, reported lead author, Nicolas Esquerre, PhD, of Lille Inflammation Research International Center at Université Lille in France, and his colleagues. The study contributes to ongoing research surrounding causes and mechanisms of IBS, which may vary among patients because of disease subsets. These findings suggest that some patients with IBS may benefit from dietary aluminum restriction or chelation therapy.
“[T]he question of the initial trigger [of IBS] still remains unresolved,” the investigators wrote. “A more precise link between food and IBS has been demonstrated for gluten and other wheat proteins, lactose, and nickel, highlighting particular subsets of IBS patients now diagnosed as nonceliac gluten/wheat sensitivity, lactose intolerance, and nickel-allergic contact mucositis,” they added. “Here, we evaluated the effect of aluminum, a common contaminant of food and water, on abdominal pain.”
Aluminum may enter the diet as a food additive, or it may contaminate foods grown in aluminum-rich soil. Other sources of oral exposure include packaging and kitchenware. A previous study showed that most Americans ingest 0.01-1.4 mg/kg of aluminum daily, and 5% ingest 1.58 mg/kg daily (i.e., 95 mg per day for a 60-kg person).
Based on these statistics, rats in the present study received oral aluminum citrate (AlCi) corresponding with three doses of aluminum: 0.5 mg/kg, 1.5 mg/kg, or 3.0 mg/kg. Treatment continued for 30 days, with colorectal distension (CRD) measured on days 2, 4, 8, 15, and 30.
Results showed a dose-dependent relationship between aluminum ingestion and visceral hypersensitivity. Within 2 days, rats receiving 3.0 mg/kg of aluminum exhibited a significantly lower pain threshold, and within 8 days, rats receiving 0.5 mg/kg and 1.5 mg/kg also showed increased visceral hypersensitivity.
After 1 month of treatment, rats receiving 1.5 mg/kg per day demonstrated a 30% increase in pain compared with control animals. In the same group, visceral hypersensitivity began to wane 7 days after cessation of treatment; 4 more weeks were needed to return to baseline. When treatment was restarted, visceral hypersensitivity occurred within 2 days, compared with 8 days upon initial administration. These findings are particularly relevant to some people, as the 1.5-mg/kg dose corresponds with the daily amount of aluminum ingested by 5% of Americans. Similar patterns of response and sensitization were observed in rats ingesting 0.5 mg/kg and 3.0 mg/kg. Female rats were more sensitive to aluminum than were male rats, a sex pattern that mimics human IBS.
Further testing showed that rats treated with zinc citrate (ZnCi) did not exhibit changes to pain threshold, thereby excluding citrate as an aggravating factor. Rat models of noninflammatory and inflammatory colonic hypersensitivity (butyrate enema or intrathecal injection of 25%-50% ethanol in combination with 2,4,6-trinitrobenzenesulfonic acid, respectively) had visceral hypersensitivity similar to that of rats in the 1.5-mg/kg AlCi group.
Testing of colonic tissue from AlCi-treated rats did not reveal inflammatory changes according to a variety of qualifiers, including histology, myeloperoxidase activity, mRNA expression of several inflammatory cytokines, or infiltration of eosinophils or macrophages. Noninflammatory effects of aluminum, however, were found. For instance, treated rats had lower serotonin levels in enteroendocrine cells.
“Enteroendocrine cells are specialized epithelial cells that respond to luminal stimuli by releasing various biologically active compounds,” the investigators wrote. “They regulate several physiological and homeostatic functions of the gastrointestinal tract, such as postprandial secretion, motility, immune responses, and sensory functions. A reduced number of enteroendocrine cells has been observed in the duodenum, ileum, and colon of some patients with IBS.”
In addition to changes in enteroendocrine cells, AlCi-treated rats had greater colonic mast cell degranulation and histamine with upregulation of histidine decarboxylase transcripts, suggesting that aluminum activated mast cells.
To determine the role of mast cell activation in visceral hypersensitivity, rats were given AlCi with cromoglycate, an inhibitor of mast cell degranulation. This treatment reduced mast cell degranulation and visceral pain threshold, compared with AlCi-treated rats not receiving cromoglycate, suggesting that mast cell degranulation is a primary driver of visceral hypersensitivity. This observation was confirmed by a mast cell–deficient mouse strain (Kit W-sh/W-sh), that had a normal number of mast cells incapable of degranulation. Treating the mast cell–deficient mice with AlCi did not induce visceral hypersensitivity, thereby confirming the role of mast cell degranulation.
Along with mast cell degranulation, AlCi treatment led to PAR2 activation. Investigators explored the significance of this finding with PAR2 knockout mice. When treated with AlCi, PAR2 knockout mice showed no increase in visceral hypersensitivity, suggesting that hypersensitivity is dependent on PAR2 activation. Further testing revealed that mast cell–deficient mice (Kit W-sh/W-sh) did not have PAR2 upregulation either, connecting a sequence in which aluminum triggers mast cell degranulation, mast cell degranulation drives PAR2 upregulation, and PAR2 upregulation causes visceral hypersensitivity. The latter two events in this chain – mast cell degranulation and PAR2 upregulation – mirror molecular mechanisms of IBS in humans.
“We speculate that aluminum activates mast cells to release mediators that can increase excitability of nociceptive afferences contributing to the visceral pain phenotype,” the investigators wrote. “Taken together, our results linked aluminum to several mechanisms implicated in IBS pathophysiology, highlighting a possible role for aluminum as a triggering factor in IBS development.”
The investigators suggested that these findings could influence preventive or therapeutic strategies: “Aluminum might be the first identified dietary risk factor for IBS, implying that measures to limit aluminum dietary consumption or to chelate aluminum may represent novel pathways of prevention and treatment of IBS in some susceptible patients,” they wrote.
The study was funded by the European Fund for Regional Economic Development; the Hauts de France Region, Ministère de l’Enseignement Supérieur et de la Recherche (CPER IRENI); and Digestscience (European Research Foundation on Intestinal Diseases and Nutrition).
SOURCE: Esquerre N et al. Cell Mol Gastroenterol Hepatol. 2019 Sep 20. doi: 10.1016/j.jcmgh.2018.09.012.
Aluminum ingested in small amounts causes visceral hypersensitivity in rats, suggesting that dietary levels of aluminum may trigger irritable bowel syndrome (IBS) in humans, according to a study published in Cellular and Molecular Gastroenterology and Hepatology.
Rats given oral aluminum exhibited dose-dependent visceral pain along with activation of proteinase-activated receptor-2 (PAR2) and mast cell degranulation, a combination of events that mirror clinical signs and molecular mechanisms of IBS in humans, reported lead author, Nicolas Esquerre, PhD, of Lille Inflammation Research International Center at Université Lille in France, and his colleagues. The study contributes to ongoing research surrounding causes and mechanisms of IBS, which may vary among patients because of disease subsets. These findings suggest that some patients with IBS may benefit from dietary aluminum restriction or chelation therapy.
“[T]he question of the initial trigger [of IBS] still remains unresolved,” the investigators wrote. “A more precise link between food and IBS has been demonstrated for gluten and other wheat proteins, lactose, and nickel, highlighting particular subsets of IBS patients now diagnosed as nonceliac gluten/wheat sensitivity, lactose intolerance, and nickel-allergic contact mucositis,” they added. “Here, we evaluated the effect of aluminum, a common contaminant of food and water, on abdominal pain.”
Aluminum may enter the diet as a food additive, or it may contaminate foods grown in aluminum-rich soil. Other sources of oral exposure include packaging and kitchenware. A previous study showed that most Americans ingest 0.01-1.4 mg/kg of aluminum daily, and 5% ingest 1.58 mg/kg daily (i.e., 95 mg per day for a 60-kg person).
Based on these statistics, rats in the present study received oral aluminum citrate (AlCi) corresponding with three doses of aluminum: 0.5 mg/kg, 1.5 mg/kg, or 3.0 mg/kg. Treatment continued for 30 days, with colorectal distension (CRD) measured on days 2, 4, 8, 15, and 30.
Results showed a dose-dependent relationship between aluminum ingestion and visceral hypersensitivity. Within 2 days, rats receiving 3.0 mg/kg of aluminum exhibited a significantly lower pain threshold, and within 8 days, rats receiving 0.5 mg/kg and 1.5 mg/kg also showed increased visceral hypersensitivity.
After 1 month of treatment, rats receiving 1.5 mg/kg per day demonstrated a 30% increase in pain compared with control animals. In the same group, visceral hypersensitivity began to wane 7 days after cessation of treatment; 4 more weeks were needed to return to baseline. When treatment was restarted, visceral hypersensitivity occurred within 2 days, compared with 8 days upon initial administration. These findings are particularly relevant to some people, as the 1.5-mg/kg dose corresponds with the daily amount of aluminum ingested by 5% of Americans. Similar patterns of response and sensitization were observed in rats ingesting 0.5 mg/kg and 3.0 mg/kg. Female rats were more sensitive to aluminum than were male rats, a sex pattern that mimics human IBS.
Further testing showed that rats treated with zinc citrate (ZnCi) did not exhibit changes to pain threshold, thereby excluding citrate as an aggravating factor. Rat models of noninflammatory and inflammatory colonic hypersensitivity (butyrate enema or intrathecal injection of 25%-50% ethanol in combination with 2,4,6-trinitrobenzenesulfonic acid, respectively) had visceral hypersensitivity similar to that of rats in the 1.5-mg/kg AlCi group.
Testing of colonic tissue from AlCi-treated rats did not reveal inflammatory changes according to a variety of qualifiers, including histology, myeloperoxidase activity, mRNA expression of several inflammatory cytokines, or infiltration of eosinophils or macrophages. Noninflammatory effects of aluminum, however, were found. For instance, treated rats had lower serotonin levels in enteroendocrine cells.
“Enteroendocrine cells are specialized epithelial cells that respond to luminal stimuli by releasing various biologically active compounds,” the investigators wrote. “They regulate several physiological and homeostatic functions of the gastrointestinal tract, such as postprandial secretion, motility, immune responses, and sensory functions. A reduced number of enteroendocrine cells has been observed in the duodenum, ileum, and colon of some patients with IBS.”
In addition to changes in enteroendocrine cells, AlCi-treated rats had greater colonic mast cell degranulation and histamine with upregulation of histidine decarboxylase transcripts, suggesting that aluminum activated mast cells.
To determine the role of mast cell activation in visceral hypersensitivity, rats were given AlCi with cromoglycate, an inhibitor of mast cell degranulation. This treatment reduced mast cell degranulation and visceral pain threshold, compared with AlCi-treated rats not receiving cromoglycate, suggesting that mast cell degranulation is a primary driver of visceral hypersensitivity. This observation was confirmed by a mast cell–deficient mouse strain (Kit W-sh/W-sh), that had a normal number of mast cells incapable of degranulation. Treating the mast cell–deficient mice with AlCi did not induce visceral hypersensitivity, thereby confirming the role of mast cell degranulation.
Along with mast cell degranulation, AlCi treatment led to PAR2 activation. Investigators explored the significance of this finding with PAR2 knockout mice. When treated with AlCi, PAR2 knockout mice showed no increase in visceral hypersensitivity, suggesting that hypersensitivity is dependent on PAR2 activation. Further testing revealed that mast cell–deficient mice (Kit W-sh/W-sh) did not have PAR2 upregulation either, connecting a sequence in which aluminum triggers mast cell degranulation, mast cell degranulation drives PAR2 upregulation, and PAR2 upregulation causes visceral hypersensitivity. The latter two events in this chain – mast cell degranulation and PAR2 upregulation – mirror molecular mechanisms of IBS in humans.
“We speculate that aluminum activates mast cells to release mediators that can increase excitability of nociceptive afferences contributing to the visceral pain phenotype,” the investigators wrote. “Taken together, our results linked aluminum to several mechanisms implicated in IBS pathophysiology, highlighting a possible role for aluminum as a triggering factor in IBS development.”
The investigators suggested that these findings could influence preventive or therapeutic strategies: “Aluminum might be the first identified dietary risk factor for IBS, implying that measures to limit aluminum dietary consumption or to chelate aluminum may represent novel pathways of prevention and treatment of IBS in some susceptible patients,” they wrote.
The study was funded by the European Fund for Regional Economic Development; the Hauts de France Region, Ministère de l’Enseignement Supérieur et de la Recherche (CPER IRENI); and Digestscience (European Research Foundation on Intestinal Diseases and Nutrition).
SOURCE: Esquerre N et al. Cell Mol Gastroenterol Hepatol. 2019 Sep 20. doi: 10.1016/j.jcmgh.2018.09.012.
FROM CELLULAR AND MOLECULAR GASTROENTEROLOGY AND HEPATOLOGY
Key clinical point: Aluminum ingestion triggers visceral hypersensitivity in rats, suggesting that dietary levels of aluminum may contribute to development of irritable bowel syndrome in humans.
Major finding: In rodents, 1 month of oral aluminum administration led to a 30% increase in pain during colorectal distension, compared with control subjects.
Study details: A rodent study including noninflammatory and inflammatory IBS rat models, mast cell–deficient mice, and PAR2 knockout mice.
Disclosures: The study was funded by the European Fund for Regional Economic Development; the Hauts de France Region, Ministère de l’Enseignement Supérieur et de la Recherche (CPER IRENI); and Digestscience (European Research Foundation on Intestinal Diseases and Nutrition).
Source: Esquerre N et al. Cell Mol Gastroenterol Hepatol. 2019 Sep 20. doi: 10.1016/j.jcmgh.2018.09.012.
Childhood inflammatory bowel disease linked to increased mortality
Children who developed inflammatory bowel disease before the age of 18 had a three- to fivefold increase in risk of death, compared with others in a large, retrospective registry study.
The study, which spanned a recent 50-year period, found “no evidence that [these] hazard ratios have changed since the introduction of immunomodulators and biologics,” wrote Ola Olén, MD, PhD, of Karolinska University Hospital in Sola, Sweden, together with her associates. Malignancy was the most frequent cause of death among patients with childhood-onset inflammatory bowel disease, followed by digestive diseases and infections. Absolute numbers of premature deaths were low, but the increase in relative risk was highest among patients with childhood-onset ulcerative colitis with primary sclerosing cholangitis and patients who had a first-degree relative with ulcerative colitis. The findings were published in the February issue of Gastroenterology.
Inflammatory bowel disease is thought to be more severe when it begins in childhood, but data on mortality for these patients are lacking. Using national Swedish health registries, Dr. Olén and her associates compared deaths among 9,442 children and adolescents with inflammatory bowel disease with those among 93,180 others matched by sex, age, and place of residence. Both groups were typically followed through age 30 years, and the study covered 1964 through 2014.
In all, there were 294 deaths among patients with childhood-onset inflammatory bowel disease (2.1 deaths per 1,000 person-years) and 940 deaths among matched individuals (0.7 deaths per 1,000 person-years), for a statistically significant adjusted hazard ratio of 3.2 (95% confidence interval, 2.8-3.7). For every 694 patients with childhood-onset inflammatory bowel disease who were followed through adulthood, there was one additional death per year, compared with a demographically similar population, the researchers determined.
Among the 294 deaths, 133 were because of cancer. Consequently, individuals with childhood-onset inflammatory bowel disease had a more than sixfold greater risk of dying from cancer than the general population (HR, 6.6; 95% CI, 5.3-8.2). The risk of death from malignancy was higher among individuals with ulcerative colitis (HR, 9.7) than among those with Crohn’s disease (HR, 3.1). Deaths from conditions of the digestive system were next most common, and these included deaths from liver failure.
In all, 27 individuals with childhood-onset inflammatory bowel disease died before their 18th birthday, for a fivefold increase in the adjusted hazard of death, compared with the general population of children and adolescents (HR, 4.9; 95% CI, 3.0-7.7). There was no significant trend in hazard of death according to calendar period, either among children and adolescents, or young adults (followed through age 25 years), the researchers said.
Additionally, childhood-onset inflammatory bowel disease was associated with a 2.2-year shorter life expectancy in patients followed through age 65 years, they reported. Thus, a diagnosis of childhood-onset inflammatory bowel disease merits careful follow-up, especially if patients have ulcerative colitis and primary sclerosing cholangitis, which was the strongest correlate of fatal intestinal cancer in this study.
Funders included the Swedish Medical Society, the Swedish Cancer Society, the Swedish Research Council, the Swedish Foundation for Strategic Research, Magtarmfonden, the Jane and Dan Olsson Foundation, the Mjölkdroppen Foundation, and the Karolinska Institutet Foundation. Dr. Olén disclosed investigator-initiated grants from Janssen and Pfizer. Other investigators also disclosed ties to Janssen, Pfizer, AstraZeneca, Ferring, Celgene, and Takeda.
SOURCE: Olén O et al. Gastroenterology. 2018 Oct 17. doi: 10.1053/j.gastro.2018.10.028.
Children who developed inflammatory bowel disease before the age of 18 had a three- to fivefold increase in risk of death, compared with others in a large, retrospective registry study.
The study, which spanned a recent 50-year period, found “no evidence that [these] hazard ratios have changed since the introduction of immunomodulators and biologics,” wrote Ola Olén, MD, PhD, of Karolinska University Hospital in Sola, Sweden, together with her associates. Malignancy was the most frequent cause of death among patients with childhood-onset inflammatory bowel disease, followed by digestive diseases and infections. Absolute numbers of premature deaths were low, but the increase in relative risk was highest among patients with childhood-onset ulcerative colitis with primary sclerosing cholangitis and patients who had a first-degree relative with ulcerative colitis. The findings were published in the February issue of Gastroenterology.
Inflammatory bowel disease is thought to be more severe when it begins in childhood, but data on mortality for these patients are lacking. Using national Swedish health registries, Dr. Olén and her associates compared deaths among 9,442 children and adolescents with inflammatory bowel disease with those among 93,180 others matched by sex, age, and place of residence. Both groups were typically followed through age 30 years, and the study covered 1964 through 2014.
In all, there were 294 deaths among patients with childhood-onset inflammatory bowel disease (2.1 deaths per 1,000 person-years) and 940 deaths among matched individuals (0.7 deaths per 1,000 person-years), for a statistically significant adjusted hazard ratio of 3.2 (95% confidence interval, 2.8-3.7). For every 694 patients with childhood-onset inflammatory bowel disease who were followed through adulthood, there was one additional death per year, compared with a demographically similar population, the researchers determined.
Among the 294 deaths, 133 were because of cancer. Consequently, individuals with childhood-onset inflammatory bowel disease had a more than sixfold greater risk of dying from cancer than the general population (HR, 6.6; 95% CI, 5.3-8.2). The risk of death from malignancy was higher among individuals with ulcerative colitis (HR, 9.7) than among those with Crohn’s disease (HR, 3.1). Deaths from conditions of the digestive system were next most common, and these included deaths from liver failure.
In all, 27 individuals with childhood-onset inflammatory bowel disease died before their 18th birthday, for a fivefold increase in the adjusted hazard of death, compared with the general population of children and adolescents (HR, 4.9; 95% CI, 3.0-7.7). There was no significant trend in hazard of death according to calendar period, either among children and adolescents, or young adults (followed through age 25 years), the researchers said.
Additionally, childhood-onset inflammatory bowel disease was associated with a 2.2-year shorter life expectancy in patients followed through age 65 years, they reported. Thus, a diagnosis of childhood-onset inflammatory bowel disease merits careful follow-up, especially if patients have ulcerative colitis and primary sclerosing cholangitis, which was the strongest correlate of fatal intestinal cancer in this study.
Funders included the Swedish Medical Society, the Swedish Cancer Society, the Swedish Research Council, the Swedish Foundation for Strategic Research, Magtarmfonden, the Jane and Dan Olsson Foundation, the Mjölkdroppen Foundation, and the Karolinska Institutet Foundation. Dr. Olén disclosed investigator-initiated grants from Janssen and Pfizer. Other investigators also disclosed ties to Janssen, Pfizer, AstraZeneca, Ferring, Celgene, and Takeda.
SOURCE: Olén O et al. Gastroenterology. 2018 Oct 17. doi: 10.1053/j.gastro.2018.10.028.
Children who developed inflammatory bowel disease before the age of 18 had a three- to fivefold increase in risk of death, compared with others in a large, retrospective registry study.
The study, which spanned a recent 50-year period, found “no evidence that [these] hazard ratios have changed since the introduction of immunomodulators and biologics,” wrote Ola Olén, MD, PhD, of Karolinska University Hospital in Sola, Sweden, together with her associates. Malignancy was the most frequent cause of death among patients with childhood-onset inflammatory bowel disease, followed by digestive diseases and infections. Absolute numbers of premature deaths were low, but the increase in relative risk was highest among patients with childhood-onset ulcerative colitis with primary sclerosing cholangitis and patients who had a first-degree relative with ulcerative colitis. The findings were published in the February issue of Gastroenterology.
Inflammatory bowel disease is thought to be more severe when it begins in childhood, but data on mortality for these patients are lacking. Using national Swedish health registries, Dr. Olén and her associates compared deaths among 9,442 children and adolescents with inflammatory bowel disease with those among 93,180 others matched by sex, age, and place of residence. Both groups were typically followed through age 30 years, and the study covered 1964 through 2014.
In all, there were 294 deaths among patients with childhood-onset inflammatory bowel disease (2.1 deaths per 1,000 person-years) and 940 deaths among matched individuals (0.7 deaths per 1,000 person-years), for a statistically significant adjusted hazard ratio of 3.2 (95% confidence interval, 2.8-3.7). For every 694 patients with childhood-onset inflammatory bowel disease who were followed through adulthood, there was one additional death per year, compared with a demographically similar population, the researchers determined.
Among the 294 deaths, 133 were because of cancer. Consequently, individuals with childhood-onset inflammatory bowel disease had a more than sixfold greater risk of dying from cancer than the general population (HR, 6.6; 95% CI, 5.3-8.2). The risk of death from malignancy was higher among individuals with ulcerative colitis (HR, 9.7) than among those with Crohn’s disease (HR, 3.1). Deaths from conditions of the digestive system were next most common, and these included deaths from liver failure.
In all, 27 individuals with childhood-onset inflammatory bowel disease died before their 18th birthday, for a fivefold increase in the adjusted hazard of death, compared with the general population of children and adolescents (HR, 4.9; 95% CI, 3.0-7.7). There was no significant trend in hazard of death according to calendar period, either among children and adolescents, or young adults (followed through age 25 years), the researchers said.
Additionally, childhood-onset inflammatory bowel disease was associated with a 2.2-year shorter life expectancy in patients followed through age 65 years, they reported. Thus, a diagnosis of childhood-onset inflammatory bowel disease merits careful follow-up, especially if patients have ulcerative colitis and primary sclerosing cholangitis, which was the strongest correlate of fatal intestinal cancer in this study.
Funders included the Swedish Medical Society, the Swedish Cancer Society, the Swedish Research Council, the Swedish Foundation for Strategic Research, Magtarmfonden, the Jane and Dan Olsson Foundation, the Mjölkdroppen Foundation, and the Karolinska Institutet Foundation. Dr. Olén disclosed investigator-initiated grants from Janssen and Pfizer. Other investigators also disclosed ties to Janssen, Pfizer, AstraZeneca, Ferring, Celgene, and Takeda.
SOURCE: Olén O et al. Gastroenterology. 2018 Oct 17. doi: 10.1053/j.gastro.2018.10.028.
FROM GASTROENTEROLOGY
Key clinical point: Childhood-onset inflammatory bowel disease is associated with an increased risk of death.
Major finding: The risk was approximately threefold higher than in the general population in those with childhood-onset inflammatory bowel disease aged under 25 years (aHR, 3.2; 95% CI, 2.8-3.7).
Study details: Retrospective cohort study of 9,442 patients with childhood-onset inflammatory bowel disease and 93,180 individuals from the general population.
Disclosures: Funders included the Swedish Medical Society, the Swedish Cancer Society, the Swedish Research Council, the Swedish Foundation for Strategic Research, Magtarmfonden, the Jane and Dan Olsson Foundation, the Mjölkdroppen Foundation, and the Karolinska Institutet Foundation. Dr. Olén disclosed investigator-initiated grants from Janssen and Pfizer. Other investigators also disclosed ties to Janssen, Pfizer, AstraZeneca, Ferring, Celgene, and Takeda.
Source: Olén O et al. Gastroenterology. 2018 Oct 17.
Studies support vedolizumab-calcineurin inhibitor combinations but not accelerated infliximab therapy for refractory UC
For patients with treatment-refractory ulcerative colitis, accelerated induction with infliximab did not appear to reduce the need for colectomy, while adding a calcineurin inhibitor to vedolizumab safely and effectively induced clinical remission in nearly half of patients, according to the results of two studies published in Clinical Gastroenterology and Hepatology.
The first study retrospectively evaluated 213 patients with acute severe ulcerative colitis who received infliximab rescue therapy at three gastroenterology centers between 2005 and 2017. Rates of subsequent colectomy were similar whether patients received infliximab (5 mg/kg) at weeks 0, 2, and 6, or were on an accelerated schedule (8% vs. 9%, respectively; adjusted odds ratio, 1.35; 95% confidence interval, 0.38-4.82).
However, among patients who received accelerated treatment, those who received a higher initial dose of infliximab (10 mg/kg) were less likely to subsequently undergo colectomy than those who started at 5 mg/kg and received “chaser” 5-mg or 10-mg doses before week 2, reported Niharika Nalagatla, MD, of Massachusetts General Hospital in Boston, with her associates. “While there was no statistically significant difference [between these groups], there were numerically lower rates of in-hospital and long-term colectomy in the 10 mg/kg group, with a trend toward statistical significance at 2 years [OR, 0.44; 95% CI, 0.18-1.12; P = .08],” they added.
They reported similar results from their systematic review and meta-analysis of seven studies of infliximab induction schedules in patients with acute severe ulcerative colitis. Accordingly, they called for prospective studies to identify which patients are most likely to benefit from accelerated infliximab therapy.
The second study, which was prospective, included 11 patients with treatment-refractory ulcerative colitis who initially received vedolizumab immunotherapy and then started on a calcineurin inhibitor (either tacrolimus or cyclosporine) during their first 12 months of treatment. Rates of steroid-free clinical remission (Harvey-Bradshaw index score less than 4 or short clinical colitis activity index score less than 2) were 55% at week 14 and 45% at week 52, reported Britt Christensen, MD, of the University of Chicago and the Royal Melbourne Hospital, with her associates.
Two of these patients were hospitalized for intravenous cyclosporine plus corticosteroid therapy because they failed to respond to 3 months of treatment with vedolizumab plus prednisolone (40 mg), the investigators noted. One patient did not respond and ultimately underwent colectomy, while the other tapered off cyclosporine after 51 days of treatment and remained in steroid-and calcineurin-free clinical remission at 12 months.
Serious adverse events were uncommon, reflecting the relatively good safety profile of vedolizumab. Combination antitumor necrosis factor and calcineurin inhibitor therapy has been linked to severe infections and deaths, and clinical trials of vedolizumab excluded patients with calcineurin inhibitor exposure. However, vedolizumab primarily targets the localized immune system of the gut, so adding an agent “with broad immune-suppressing effects would not [lead to greater] infective and other complications,” the investigators wrote. “Indeed, no significant toxicity was observed in our series, despite the fact that many patients were on quadruple immunosuppressive therapy, at least initially.”
Dr. Nalagatla reported receiving support from the National Institutes of Health and the Crohn’s & Colitis Foundation. She reported having no relevant conflicts of interest. One of her coinvestigators reported ties to AbbVie, Takeda, Gilead, Merck, and Pfizer. Dr. Christensen and her associates reported receiving support from the University of Chicago and the government of Australia. Dr. Christensen reported ties to Janssen, AbbVie, Takeda, and Pfizer, and four of her coinvestigators also reported ties to a number of pharmaceutical companies.
SOURCES: Nalagatla N et al. Clin Gastroenterol Hepatol. 2018 Jun 23. doi: 10.1016/j.cgh.2018.06.031; Christensen B et al. Clin Gastroenterol Hepatol. 2018 May 8. doi: 10.1016/j.cgh.2018.04.060.
We physicians are not known for our humility. However, acute severe ulcerative colitis (UC) can humble even the most confident inflammatory bowel disease specialist. The study by Nalagatla et al. did not show a difference of colectomy outcomes between accelerated versus standard infliximab induction. However, as the authors point out, their methodology was unable to address confounding by severity. Review of the baseline characteristics implies presence of confounding with numerically higher markers of inflammation in the accelerated infliximab group. The signal of lower, although not statistically significant, odds of colectomy in subgroup analyses of 10 mg/kg versus standard induction should encourage further investigation in 10-mg/kg induction dosing for acute severe UC.
These two studies continue to expand possibilities to manage acute severe UC and direct areas to focus future research.
Jason Ken Hou, MD, MS, is assistant professor of medicine-gastroenterology, director of the GI & Hepatology Fellowship Program, and director of research–IBD at Baylor College of Medicine, Houston, and staff physician of gastroenterology at Michael E. DeBakey VA Medical Center, Houston. He has financial ties to Janssen, AbbVie, and Pfizer.
We physicians are not known for our humility. However, acute severe ulcerative colitis (UC) can humble even the most confident inflammatory bowel disease specialist. The study by Nalagatla et al. did not show a difference of colectomy outcomes between accelerated versus standard infliximab induction. However, as the authors point out, their methodology was unable to address confounding by severity. Review of the baseline characteristics implies presence of confounding with numerically higher markers of inflammation in the accelerated infliximab group. The signal of lower, although not statistically significant, odds of colectomy in subgroup analyses of 10 mg/kg versus standard induction should encourage further investigation in 10-mg/kg induction dosing for acute severe UC.
These two studies continue to expand possibilities to manage acute severe UC and direct areas to focus future research.
Jason Ken Hou, MD, MS, is assistant professor of medicine-gastroenterology, director of the GI & Hepatology Fellowship Program, and director of research–IBD at Baylor College of Medicine, Houston, and staff physician of gastroenterology at Michael E. DeBakey VA Medical Center, Houston. He has financial ties to Janssen, AbbVie, and Pfizer.
We physicians are not known for our humility. However, acute severe ulcerative colitis (UC) can humble even the most confident inflammatory bowel disease specialist. The study by Nalagatla et al. did not show a difference of colectomy outcomes between accelerated versus standard infliximab induction. However, as the authors point out, their methodology was unable to address confounding by severity. Review of the baseline characteristics implies presence of confounding with numerically higher markers of inflammation in the accelerated infliximab group. The signal of lower, although not statistically significant, odds of colectomy in subgroup analyses of 10 mg/kg versus standard induction should encourage further investigation in 10-mg/kg induction dosing for acute severe UC.
These two studies continue to expand possibilities to manage acute severe UC and direct areas to focus future research.
Jason Ken Hou, MD, MS, is assistant professor of medicine-gastroenterology, director of the GI & Hepatology Fellowship Program, and director of research–IBD at Baylor College of Medicine, Houston, and staff physician of gastroenterology at Michael E. DeBakey VA Medical Center, Houston. He has financial ties to Janssen, AbbVie, and Pfizer.
For patients with treatment-refractory ulcerative colitis, accelerated induction with infliximab did not appear to reduce the need for colectomy, while adding a calcineurin inhibitor to vedolizumab safely and effectively induced clinical remission in nearly half of patients, according to the results of two studies published in Clinical Gastroenterology and Hepatology.
The first study retrospectively evaluated 213 patients with acute severe ulcerative colitis who received infliximab rescue therapy at three gastroenterology centers between 2005 and 2017. Rates of subsequent colectomy were similar whether patients received infliximab (5 mg/kg) at weeks 0, 2, and 6, or were on an accelerated schedule (8% vs. 9%, respectively; adjusted odds ratio, 1.35; 95% confidence interval, 0.38-4.82).
However, among patients who received accelerated treatment, those who received a higher initial dose of infliximab (10 mg/kg) were less likely to subsequently undergo colectomy than those who started at 5 mg/kg and received “chaser” 5-mg or 10-mg doses before week 2, reported Niharika Nalagatla, MD, of Massachusetts General Hospital in Boston, with her associates. “While there was no statistically significant difference [between these groups], there were numerically lower rates of in-hospital and long-term colectomy in the 10 mg/kg group, with a trend toward statistical significance at 2 years [OR, 0.44; 95% CI, 0.18-1.12; P = .08],” they added.
They reported similar results from their systematic review and meta-analysis of seven studies of infliximab induction schedules in patients with acute severe ulcerative colitis. Accordingly, they called for prospective studies to identify which patients are most likely to benefit from accelerated infliximab therapy.
The second study, which was prospective, included 11 patients with treatment-refractory ulcerative colitis who initially received vedolizumab immunotherapy and then started on a calcineurin inhibitor (either tacrolimus or cyclosporine) during their first 12 months of treatment. Rates of steroid-free clinical remission (Harvey-Bradshaw index score less than 4 or short clinical colitis activity index score less than 2) were 55% at week 14 and 45% at week 52, reported Britt Christensen, MD, of the University of Chicago and the Royal Melbourne Hospital, with her associates.
Two of these patients were hospitalized for intravenous cyclosporine plus corticosteroid therapy because they failed to respond to 3 months of treatment with vedolizumab plus prednisolone (40 mg), the investigators noted. One patient did not respond and ultimately underwent colectomy, while the other tapered off cyclosporine after 51 days of treatment and remained in steroid-and calcineurin-free clinical remission at 12 months.
Serious adverse events were uncommon, reflecting the relatively good safety profile of vedolizumab. Combination antitumor necrosis factor and calcineurin inhibitor therapy has been linked to severe infections and deaths, and clinical trials of vedolizumab excluded patients with calcineurin inhibitor exposure. However, vedolizumab primarily targets the localized immune system of the gut, so adding an agent “with broad immune-suppressing effects would not [lead to greater] infective and other complications,” the investigators wrote. “Indeed, no significant toxicity was observed in our series, despite the fact that many patients were on quadruple immunosuppressive therapy, at least initially.”
Dr. Nalagatla reported receiving support from the National Institutes of Health and the Crohn’s & Colitis Foundation. She reported having no relevant conflicts of interest. One of her coinvestigators reported ties to AbbVie, Takeda, Gilead, Merck, and Pfizer. Dr. Christensen and her associates reported receiving support from the University of Chicago and the government of Australia. Dr. Christensen reported ties to Janssen, AbbVie, Takeda, and Pfizer, and four of her coinvestigators also reported ties to a number of pharmaceutical companies.
SOURCES: Nalagatla N et al. Clin Gastroenterol Hepatol. 2018 Jun 23. doi: 10.1016/j.cgh.2018.06.031; Christensen B et al. Clin Gastroenterol Hepatol. 2018 May 8. doi: 10.1016/j.cgh.2018.04.060.
For patients with treatment-refractory ulcerative colitis, accelerated induction with infliximab did not appear to reduce the need for colectomy, while adding a calcineurin inhibitor to vedolizumab safely and effectively induced clinical remission in nearly half of patients, according to the results of two studies published in Clinical Gastroenterology and Hepatology.
The first study retrospectively evaluated 213 patients with acute severe ulcerative colitis who received infliximab rescue therapy at three gastroenterology centers between 2005 and 2017. Rates of subsequent colectomy were similar whether patients received infliximab (5 mg/kg) at weeks 0, 2, and 6, or were on an accelerated schedule (8% vs. 9%, respectively; adjusted odds ratio, 1.35; 95% confidence interval, 0.38-4.82).
However, among patients who received accelerated treatment, those who received a higher initial dose of infliximab (10 mg/kg) were less likely to subsequently undergo colectomy than those who started at 5 mg/kg and received “chaser” 5-mg or 10-mg doses before week 2, reported Niharika Nalagatla, MD, of Massachusetts General Hospital in Boston, with her associates. “While there was no statistically significant difference [between these groups], there were numerically lower rates of in-hospital and long-term colectomy in the 10 mg/kg group, with a trend toward statistical significance at 2 years [OR, 0.44; 95% CI, 0.18-1.12; P = .08],” they added.
They reported similar results from their systematic review and meta-analysis of seven studies of infliximab induction schedules in patients with acute severe ulcerative colitis. Accordingly, they called for prospective studies to identify which patients are most likely to benefit from accelerated infliximab therapy.
The second study, which was prospective, included 11 patients with treatment-refractory ulcerative colitis who initially received vedolizumab immunotherapy and then started on a calcineurin inhibitor (either tacrolimus or cyclosporine) during their first 12 months of treatment. Rates of steroid-free clinical remission (Harvey-Bradshaw index score less than 4 or short clinical colitis activity index score less than 2) were 55% at week 14 and 45% at week 52, reported Britt Christensen, MD, of the University of Chicago and the Royal Melbourne Hospital, with her associates.
Two of these patients were hospitalized for intravenous cyclosporine plus corticosteroid therapy because they failed to respond to 3 months of treatment with vedolizumab plus prednisolone (40 mg), the investigators noted. One patient did not respond and ultimately underwent colectomy, while the other tapered off cyclosporine after 51 days of treatment and remained in steroid-and calcineurin-free clinical remission at 12 months.
Serious adverse events were uncommon, reflecting the relatively good safety profile of vedolizumab. Combination antitumor necrosis factor and calcineurin inhibitor therapy has been linked to severe infections and deaths, and clinical trials of vedolizumab excluded patients with calcineurin inhibitor exposure. However, vedolizumab primarily targets the localized immune system of the gut, so adding an agent “with broad immune-suppressing effects would not [lead to greater] infective and other complications,” the investigators wrote. “Indeed, no significant toxicity was observed in our series, despite the fact that many patients were on quadruple immunosuppressive therapy, at least initially.”
Dr. Nalagatla reported receiving support from the National Institutes of Health and the Crohn’s & Colitis Foundation. She reported having no relevant conflicts of interest. One of her coinvestigators reported ties to AbbVie, Takeda, Gilead, Merck, and Pfizer. Dr. Christensen and her associates reported receiving support from the University of Chicago and the government of Australia. Dr. Christensen reported ties to Janssen, AbbVie, Takeda, and Pfizer, and four of her coinvestigators also reported ties to a number of pharmaceutical companies.
SOURCES: Nalagatla N et al. Clin Gastroenterol Hepatol. 2018 Jun 23. doi: 10.1016/j.cgh.2018.06.031; Christensen B et al. Clin Gastroenterol Hepatol. 2018 May 8. doi: 10.1016/j.cgh.2018.04.060.
FROM CLINICAL GASTROENTEROLOGY AND HEPATOLOGY
Key clinical point: For patients with treatment-refractory ulcerative colitis, an accelerated schedule of infliximab did not appear to reduce the likelihood of colectomy, compared with a standard induction schedule; induction with vedolizumab plus a calcineurin inhibitor (cyclosporine or tacrolimus) induced clinical remission in nearly half of such patients.
Major finding: Rates of colectomy were similar whether patients received induction immunotherapy with infliximab (5 mg/kg) at weeks 0, 2, and 6, or were on an accelerated schedule (8% vs. 9%, respectively; adjusted odds ratio, 1.35; 95% confidence interval, 0.38-4.82). In a separate study, rates of steroid-free clinical remission were 55% at week 14 and 45% at week 52.
Study details: A retrospective study of 213 patients with acute severe steroid-refractory ulcerative colitis; a prospective observational study of 20 patients with ulcerative colitis or Crohn’s disease who received vedolizumab and a calcineurin inhibitor (cyclosporine or tacrolimus).
Disclosures: Dr. Nalagatla reported receiving support from the National Institutes of Health and the Crohn’s & Colitis Foundation. She reported having no relevant conflicts of interest. One of her coinvestigators reported ties to AbbVie, Takeda, Gilead, Merck, and Pfizer. Dr. Christensen and her associates reported receiving support from the University of Chicago and the government of Australia. Dr. Christensen reported ties to Janssen, AbbVie, Takeda, and Pfizer, and four of her coinvestigators also reported ties to a number of pharmaceutical companies.
Sources: Nalagatla N et al. Clin Gastroenterol Hepatol. 2018 Jun 23; Christensen B, et al. Clin Gastroenterol Hepatol. 2018 May 8.
Clinical Guidance: Thiopurine agents for the treatment of IBD
A new clinical practice update recommends combination therapy with tumor necrosis factor (TNF) inhibitors and thiopurines, as opposed to either therapy alone, for the treatment of ulcerative colitis (UC) and Crohn’s disease (CD). The commentary was published in Gastroenterology.
Clinicians should also note that while several clinical trials use weight-based dosing to monitor clinical response following thiopurine therapy, 6-thioguanine levels have inevitably shown to better predict prognosis, wrote Stephen B. Hanauer, MD, AGAF, of Northwestern University in Chicago and his colleagues.
The thiopurine drug class is composed of many different agents, including thioguanine, azathioprine, and mercaptopurine. Methotrexate, a folate antagonist affecting thymidylate production, is commonly used alongside thiopurines as steroid-sparing agents for patients with UC and CD. Among these therapies, various different dosing strategies and routes of administration are used to manage active disease.
Initially, thiopurines were studied exclusively as monotherapy for the treatment of patients with steroid-intractable CD; however, results showed only marginal benefit when using these agents alone. As a result, combination trials were performed subsequently, and these revealed modest efficacy for use as maintenance therapies in both UC and CD. Further studies reported that methotrexate is beneficial only as a maintenance therapy for CD given that trial evidence confirmed treatment limitations in patients with UC.
“Thiopurines also have the potential to reduce postoperative recurrence of Crohn’s disease, in particular when administered with imidazole antibiotics,” the experts wrote. “There is currently no controlled data regarding the efficacy of methotrexate as maintenance therapy in ulcerative colitis,” they added.
Despite its limitations in UC, 25 mg of methotrexate administered intramuscularly once weekly in combination with oral steroids has shown benefits for inducing disease remission and limiting steroid use in the management of active CD. Comparatively, other trials have failed to show the same benefits with oral methotrexate. In addition, a number of clinical case series have reported benefit for use of methotrexate as a maintenance therapy for CD in patients who initially responded to methotrexate induction therapy.
Consequently, Dr. Hanauer and his colleagues recommended that methotrexate only be given in combination with biologics if being used for the treatment of UC.
“Thiopurines and methotrexate can be used in combination with anti-TNF biologics, in particular infliximab, to reduce immunogenicity and increase blood levels,” they stated.
One agent in particular, thioguanine, exhibits unique therapeutic efficacy in patients allergic to azathioprine or mercaptopurine. Despite this benefit, thioguanine use has been linked with an increased risk of developing hepatic nodular regenerative hyperplasia, as well as venoocclusive disease. Given these limitations, long-term use of thioguanine was not recommended by the authors.
With respect to safety, routine laboratory monitoring for both liver and hematologic adverse effects is recommended. In rare cases, patients may develop secondary lymphomas in response to thiopurine treatment. Moreover, regular follow-up is essential because of the higher prevalence of nonmelanoma skin cancers seen with thiopurines use.
“Patients using thiopurines for the treatment of IBD, particularly Caucasian patients, should avoid excessive sun exposure and use high-strength sun block,” the experts wrote. “Health care deliverers should ensure patients undergo appropriate dermatologic evaluations and investigate suspicious skin lesions in these patients,” they further reported.
Another important monitoring consideration is ongoing infection risk, in particular with opportunistic and viral pathogens. Because of the immunosuppressive effects of therapy, both methotrexate and thiopurine use are linked with a greater chance of developing these infections. Accordingly, Dr. Hanauer and his colleagues recommended that, before initiation of these therapies, applicable preventative measures should be taken, including administration of influenza, human papillomavirus, varicella zoster virus, pneumococcus, and hepatitis B vaccines.
“Live vaccines are contraindicated once therapy has begun; however, zoster vaccination can be given while patients are receiving azathioprine at less than 2 mg/kg,” they stated.
The experts went on to report that withdrawal of thiopurine agents, when used in combination therapy, has the potential to reduce therapeutic levels of infliximab and promote development of antidrug antibodies. However, the experts did not suggest a method to manage these complications. Further studies are needed to answer these and other remaining questions regarding thiopurine use in the setting of IBD.
SOURCE: Hanauer SB et al. Gastroenterology. 2018 Sep 6. doi: 10.1053/j.gastro.2018.08.043.
*This story was updated on January 4, 2019.
A new clinical practice update recommends combination therapy with tumor necrosis factor (TNF) inhibitors and thiopurines, as opposed to either therapy alone, for the treatment of ulcerative colitis (UC) and Crohn’s disease (CD). The commentary was published in Gastroenterology.
Clinicians should also note that while several clinical trials use weight-based dosing to monitor clinical response following thiopurine therapy, 6-thioguanine levels have inevitably shown to better predict prognosis, wrote Stephen B. Hanauer, MD, AGAF, of Northwestern University in Chicago and his colleagues.
The thiopurine drug class is composed of many different agents, including thioguanine, azathioprine, and mercaptopurine. Methotrexate, a folate antagonist affecting thymidylate production, is commonly used alongside thiopurines as steroid-sparing agents for patients with UC and CD. Among these therapies, various different dosing strategies and routes of administration are used to manage active disease.
Initially, thiopurines were studied exclusively as monotherapy for the treatment of patients with steroid-intractable CD; however, results showed only marginal benefit when using these agents alone. As a result, combination trials were performed subsequently, and these revealed modest efficacy for use as maintenance therapies in both UC and CD. Further studies reported that methotrexate is beneficial only as a maintenance therapy for CD given that trial evidence confirmed treatment limitations in patients with UC.
“Thiopurines also have the potential to reduce postoperative recurrence of Crohn’s disease, in particular when administered with imidazole antibiotics,” the experts wrote. “There is currently no controlled data regarding the efficacy of methotrexate as maintenance therapy in ulcerative colitis,” they added.
Despite its limitations in UC, 25 mg of methotrexate administered intramuscularly once weekly in combination with oral steroids has shown benefits for inducing disease remission and limiting steroid use in the management of active CD. Comparatively, other trials have failed to show the same benefits with oral methotrexate. In addition, a number of clinical case series have reported benefit for use of methotrexate as a maintenance therapy for CD in patients who initially responded to methotrexate induction therapy.
Consequently, Dr. Hanauer and his colleagues recommended that methotrexate only be given in combination with biologics if being used for the treatment of UC.
“Thiopurines and methotrexate can be used in combination with anti-TNF biologics, in particular infliximab, to reduce immunogenicity and increase blood levels,” they stated.
One agent in particular, thioguanine, exhibits unique therapeutic efficacy in patients allergic to azathioprine or mercaptopurine. Despite this benefit, thioguanine use has been linked with an increased risk of developing hepatic nodular regenerative hyperplasia, as well as venoocclusive disease. Given these limitations, long-term use of thioguanine was not recommended by the authors.
With respect to safety, routine laboratory monitoring for both liver and hematologic adverse effects is recommended. In rare cases, patients may develop secondary lymphomas in response to thiopurine treatment. Moreover, regular follow-up is essential because of the higher prevalence of nonmelanoma skin cancers seen with thiopurines use.
“Patients using thiopurines for the treatment of IBD, particularly Caucasian patients, should avoid excessive sun exposure and use high-strength sun block,” the experts wrote. “Health care deliverers should ensure patients undergo appropriate dermatologic evaluations and investigate suspicious skin lesions in these patients,” they further reported.
Another important monitoring consideration is ongoing infection risk, in particular with opportunistic and viral pathogens. Because of the immunosuppressive effects of therapy, both methotrexate and thiopurine use are linked with a greater chance of developing these infections. Accordingly, Dr. Hanauer and his colleagues recommended that, before initiation of these therapies, applicable preventative measures should be taken, including administration of influenza, human papillomavirus, varicella zoster virus, pneumococcus, and hepatitis B vaccines.
“Live vaccines are contraindicated once therapy has begun; however, zoster vaccination can be given while patients are receiving azathioprine at less than 2 mg/kg,” they stated.
The experts went on to report that withdrawal of thiopurine agents, when used in combination therapy, has the potential to reduce therapeutic levels of infliximab and promote development of antidrug antibodies. However, the experts did not suggest a method to manage these complications. Further studies are needed to answer these and other remaining questions regarding thiopurine use in the setting of IBD.
SOURCE: Hanauer SB et al. Gastroenterology. 2018 Sep 6. doi: 10.1053/j.gastro.2018.08.043.
*This story was updated on January 4, 2019.
A new clinical practice update recommends combination therapy with tumor necrosis factor (TNF) inhibitors and thiopurines, as opposed to either therapy alone, for the treatment of ulcerative colitis (UC) and Crohn’s disease (CD). The commentary was published in Gastroenterology.
Clinicians should also note that while several clinical trials use weight-based dosing to monitor clinical response following thiopurine therapy, 6-thioguanine levels have inevitably shown to better predict prognosis, wrote Stephen B. Hanauer, MD, AGAF, of Northwestern University in Chicago and his colleagues.
The thiopurine drug class is composed of many different agents, including thioguanine, azathioprine, and mercaptopurine. Methotrexate, a folate antagonist affecting thymidylate production, is commonly used alongside thiopurines as steroid-sparing agents for patients with UC and CD. Among these therapies, various different dosing strategies and routes of administration are used to manage active disease.
Initially, thiopurines were studied exclusively as monotherapy for the treatment of patients with steroid-intractable CD; however, results showed only marginal benefit when using these agents alone. As a result, combination trials were performed subsequently, and these revealed modest efficacy for use as maintenance therapies in both UC and CD. Further studies reported that methotrexate is beneficial only as a maintenance therapy for CD given that trial evidence confirmed treatment limitations in patients with UC.
“Thiopurines also have the potential to reduce postoperative recurrence of Crohn’s disease, in particular when administered with imidazole antibiotics,” the experts wrote. “There is currently no controlled data regarding the efficacy of methotrexate as maintenance therapy in ulcerative colitis,” they added.
Despite its limitations in UC, 25 mg of methotrexate administered intramuscularly once weekly in combination with oral steroids has shown benefits for inducing disease remission and limiting steroid use in the management of active CD. Comparatively, other trials have failed to show the same benefits with oral methotrexate. In addition, a number of clinical case series have reported benefit for use of methotrexate as a maintenance therapy for CD in patients who initially responded to methotrexate induction therapy.
Consequently, Dr. Hanauer and his colleagues recommended that methotrexate only be given in combination with biologics if being used for the treatment of UC.
“Thiopurines and methotrexate can be used in combination with anti-TNF biologics, in particular infliximab, to reduce immunogenicity and increase blood levels,” they stated.
One agent in particular, thioguanine, exhibits unique therapeutic efficacy in patients allergic to azathioprine or mercaptopurine. Despite this benefit, thioguanine use has been linked with an increased risk of developing hepatic nodular regenerative hyperplasia, as well as venoocclusive disease. Given these limitations, long-term use of thioguanine was not recommended by the authors.
With respect to safety, routine laboratory monitoring for both liver and hematologic adverse effects is recommended. In rare cases, patients may develop secondary lymphomas in response to thiopurine treatment. Moreover, regular follow-up is essential because of the higher prevalence of nonmelanoma skin cancers seen with thiopurines use.
“Patients using thiopurines for the treatment of IBD, particularly Caucasian patients, should avoid excessive sun exposure and use high-strength sun block,” the experts wrote. “Health care deliverers should ensure patients undergo appropriate dermatologic evaluations and investigate suspicious skin lesions in these patients,” they further reported.
Another important monitoring consideration is ongoing infection risk, in particular with opportunistic and viral pathogens. Because of the immunosuppressive effects of therapy, both methotrexate and thiopurine use are linked with a greater chance of developing these infections. Accordingly, Dr. Hanauer and his colleagues recommended that, before initiation of these therapies, applicable preventative measures should be taken, including administration of influenza, human papillomavirus, varicella zoster virus, pneumococcus, and hepatitis B vaccines.
“Live vaccines are contraindicated once therapy has begun; however, zoster vaccination can be given while patients are receiving azathioprine at less than 2 mg/kg,” they stated.
The experts went on to report that withdrawal of thiopurine agents, when used in combination therapy, has the potential to reduce therapeutic levels of infliximab and promote development of antidrug antibodies. However, the experts did not suggest a method to manage these complications. Further studies are needed to answer these and other remaining questions regarding thiopurine use in the setting of IBD.
SOURCE: Hanauer SB et al. Gastroenterology. 2018 Sep 6. doi: 10.1053/j.gastro.2018.08.043.
*This story was updated on January 4, 2019.
FROM GASTROENTEROLOGY
Key clinical point: Best clinical practices surrounding the use of thiopurines in patients with inflammatory bowel disease (IBD) were summarized by a group of experts.
Major finding:
Study details: Expert opinion consensus–based review of current evidence surrounding thiopurine therapy for IBD, without complete systematic review of the literature.
Disclosures: The authors reported no conflicts of interest.
Source: Hanauer SB et al. Gastroenterology. 2018 Sep 6. doi: 10.1053/j.gastro.2018.08.043.
Vedolizumab, tofacitinib induced rapid improvements in IBD symptoms
Two recent studies highlight the ability of vedolizumab and tofacitinib to rapidly improve symptoms reported by patients with inflammatory bowel disease (IBD).
In a post hoc study of 1,758 patients with ulcerative colitis (UC) or Crohn’s disease (CD) in the phase 3 GEMINI trials, 2 weeks of vedolizumab (Entyvio) therapy effectively improved patient-reported outcomes, and these continued to improve through 6 weeks of treatment, wrote Brian G. Feagan, MD, and his associates in the January issue of Clinical Gastroenterology and Hepatology.
In UC patients who had not previously received tumor necrosis factor (TNF) antagonists, 22% of vedolizumab recipients, compared with 7% of placebo recipients, achieved complete resolution of rectal bleeding together with a meaningful reduction in stool frequency at treatment week 2, the investigators noted. Among CD patients who were naive to TNF antagonists, 15% reported decreases in abdominal pain and loose stools at treatment week 2, compared with 8% of placebo recipients.
Although 2 weeks of vedolizumab also topped placebo for improving patient-reported outcomes among TNF antagonist–exposed patients, the effects were less pronounced, wrote Dr. Feagan, of the University of Western Ontario, London, and his associates. “These data add to the growing evidence that second-generation biologics, such as vedolizumab and ustekinumab, have higher efficacy in TNF antagonist–naive patients in both clinical trials and real-world settings. Recent trends in clinical practice are moving toward incorporating disease-modifying therapy earlier in the treatment of IBD to prevent disease progression and cumulative bowel damage.”
Patient-reported outcomes have become key during both clinical research and regulatory review of claims on proposed drug labels. In the second study, also published in the January issue of Clinical Gastroenterology and Hepatology, Stephen B. Hanauer, MD, of Northwestern University, Chicago, and his associates performed a post hoc analysis of symptoms reported by 1,139 adults with UC who received the oral small-molecule Janus kinase inhibitor tofacitinib (10 g twice daily) or placebo during the 8-week OCTAVE Induction 1 and 2 trials. These were identical phase 3 studies of patients with moderate to severe UC who could not tolerate or had responded inadequately to TNF antagonists, corticosteroids, or thiopurines.
Compared with placebo, 3 days of tofacitinib therapy induced significantly greater reductions from baseline in patient-reported stool frequency and rectal bleeding (P less than .01 for each measure), Dr. Hanauer and his associates reported. The effect was independent of prior treatment for UC or baseline levels of C-reactive protein. These findings reflect the rapid onset of effect of tofacitinib therapy in patients with UC. In contrast, thiopurines (azathioprine and 6-mercaptopurine) can take at least 8 weeks to exhibit steroid-sparing effects.
While corticosteroids can induce UC remission within 5 days, their side effects tend to escalate over time and they “lack maintenance benefits,” the researchers wrote. “In these analyses, onset of tofacitinib efficacy occurred within 3 days, irrespective of concomitant corticosteroid use or prior anti-TNF treatment failure.”
Takeda funded the GEMINI studies. Dr. Feagan reported advisory relationships with Takeda, AbbVie, Amgen, AstraZeneca, and several other pharmaceutical companies. Dr. Hanauer also reported ties to numerous pharmaceutical companies, including Pfizer, which funded the OCTAVE trials.
SOURCES: Feagan BG et al. Clin Gastroenterol Hepatol. 2018 May 29. doi: 10.1016/j.cgh.2018.05.026; Hanauer SB et al. Clin Gastroenterol Hepatol. 2018 Jul 15. doi: 10.1016/j.cgh.2018.07.009.
Two recent studies highlight the ability of vedolizumab and tofacitinib to rapidly improve symptoms reported by patients with inflammatory bowel disease (IBD).
In a post hoc study of 1,758 patients with ulcerative colitis (UC) or Crohn’s disease (CD) in the phase 3 GEMINI trials, 2 weeks of vedolizumab (Entyvio) therapy effectively improved patient-reported outcomes, and these continued to improve through 6 weeks of treatment, wrote Brian G. Feagan, MD, and his associates in the January issue of Clinical Gastroenterology and Hepatology.
In UC patients who had not previously received tumor necrosis factor (TNF) antagonists, 22% of vedolizumab recipients, compared with 7% of placebo recipients, achieved complete resolution of rectal bleeding together with a meaningful reduction in stool frequency at treatment week 2, the investigators noted. Among CD patients who were naive to TNF antagonists, 15% reported decreases in abdominal pain and loose stools at treatment week 2, compared with 8% of placebo recipients.
Although 2 weeks of vedolizumab also topped placebo for improving patient-reported outcomes among TNF antagonist–exposed patients, the effects were less pronounced, wrote Dr. Feagan, of the University of Western Ontario, London, and his associates. “These data add to the growing evidence that second-generation biologics, such as vedolizumab and ustekinumab, have higher efficacy in TNF antagonist–naive patients in both clinical trials and real-world settings. Recent trends in clinical practice are moving toward incorporating disease-modifying therapy earlier in the treatment of IBD to prevent disease progression and cumulative bowel damage.”
Patient-reported outcomes have become key during both clinical research and regulatory review of claims on proposed drug labels. In the second study, also published in the January issue of Clinical Gastroenterology and Hepatology, Stephen B. Hanauer, MD, of Northwestern University, Chicago, and his associates performed a post hoc analysis of symptoms reported by 1,139 adults with UC who received the oral small-molecule Janus kinase inhibitor tofacitinib (10 g twice daily) or placebo during the 8-week OCTAVE Induction 1 and 2 trials. These were identical phase 3 studies of patients with moderate to severe UC who could not tolerate or had responded inadequately to TNF antagonists, corticosteroids, or thiopurines.
Compared with placebo, 3 days of tofacitinib therapy induced significantly greater reductions from baseline in patient-reported stool frequency and rectal bleeding (P less than .01 for each measure), Dr. Hanauer and his associates reported. The effect was independent of prior treatment for UC or baseline levels of C-reactive protein. These findings reflect the rapid onset of effect of tofacitinib therapy in patients with UC. In contrast, thiopurines (azathioprine and 6-mercaptopurine) can take at least 8 weeks to exhibit steroid-sparing effects.
While corticosteroids can induce UC remission within 5 days, their side effects tend to escalate over time and they “lack maintenance benefits,” the researchers wrote. “In these analyses, onset of tofacitinib efficacy occurred within 3 days, irrespective of concomitant corticosteroid use or prior anti-TNF treatment failure.”
Takeda funded the GEMINI studies. Dr. Feagan reported advisory relationships with Takeda, AbbVie, Amgen, AstraZeneca, and several other pharmaceutical companies. Dr. Hanauer also reported ties to numerous pharmaceutical companies, including Pfizer, which funded the OCTAVE trials.
SOURCES: Feagan BG et al. Clin Gastroenterol Hepatol. 2018 May 29. doi: 10.1016/j.cgh.2018.05.026; Hanauer SB et al. Clin Gastroenterol Hepatol. 2018 Jul 15. doi: 10.1016/j.cgh.2018.07.009.
Two recent studies highlight the ability of vedolizumab and tofacitinib to rapidly improve symptoms reported by patients with inflammatory bowel disease (IBD).
In a post hoc study of 1,758 patients with ulcerative colitis (UC) or Crohn’s disease (CD) in the phase 3 GEMINI trials, 2 weeks of vedolizumab (Entyvio) therapy effectively improved patient-reported outcomes, and these continued to improve through 6 weeks of treatment, wrote Brian G. Feagan, MD, and his associates in the January issue of Clinical Gastroenterology and Hepatology.
In UC patients who had not previously received tumor necrosis factor (TNF) antagonists, 22% of vedolizumab recipients, compared with 7% of placebo recipients, achieved complete resolution of rectal bleeding together with a meaningful reduction in stool frequency at treatment week 2, the investigators noted. Among CD patients who were naive to TNF antagonists, 15% reported decreases in abdominal pain and loose stools at treatment week 2, compared with 8% of placebo recipients.
Although 2 weeks of vedolizumab also topped placebo for improving patient-reported outcomes among TNF antagonist–exposed patients, the effects were less pronounced, wrote Dr. Feagan, of the University of Western Ontario, London, and his associates. “These data add to the growing evidence that second-generation biologics, such as vedolizumab and ustekinumab, have higher efficacy in TNF antagonist–naive patients in both clinical trials and real-world settings. Recent trends in clinical practice are moving toward incorporating disease-modifying therapy earlier in the treatment of IBD to prevent disease progression and cumulative bowel damage.”
Patient-reported outcomes have become key during both clinical research and regulatory review of claims on proposed drug labels. In the second study, also published in the January issue of Clinical Gastroenterology and Hepatology, Stephen B. Hanauer, MD, of Northwestern University, Chicago, and his associates performed a post hoc analysis of symptoms reported by 1,139 adults with UC who received the oral small-molecule Janus kinase inhibitor tofacitinib (10 g twice daily) or placebo during the 8-week OCTAVE Induction 1 and 2 trials. These were identical phase 3 studies of patients with moderate to severe UC who could not tolerate or had responded inadequately to TNF antagonists, corticosteroids, or thiopurines.
Compared with placebo, 3 days of tofacitinib therapy induced significantly greater reductions from baseline in patient-reported stool frequency and rectal bleeding (P less than .01 for each measure), Dr. Hanauer and his associates reported. The effect was independent of prior treatment for UC or baseline levels of C-reactive protein. These findings reflect the rapid onset of effect of tofacitinib therapy in patients with UC. In contrast, thiopurines (azathioprine and 6-mercaptopurine) can take at least 8 weeks to exhibit steroid-sparing effects.
While corticosteroids can induce UC remission within 5 days, their side effects tend to escalate over time and they “lack maintenance benefits,” the researchers wrote. “In these analyses, onset of tofacitinib efficacy occurred within 3 days, irrespective of concomitant corticosteroid use or prior anti-TNF treatment failure.”
Takeda funded the GEMINI studies. Dr. Feagan reported advisory relationships with Takeda, AbbVie, Amgen, AstraZeneca, and several other pharmaceutical companies. Dr. Hanauer also reported ties to numerous pharmaceutical companies, including Pfizer, which funded the OCTAVE trials.
SOURCES: Feagan BG et al. Clin Gastroenterol Hepatol. 2018 May 29. doi: 10.1016/j.cgh.2018.05.026; Hanauer SB et al. Clin Gastroenterol Hepatol. 2018 Jul 15. doi: 10.1016/j.cgh.2018.07.009.
Differences in gut bacteria can distinguish IBD from IBS
Thanks to shotgun metagenomic sequencing of gut microbiota, physicians are on track to more easily distinguish inflammatory bowel disease (IBD) from irritable bowel syndrome (IBS), according to an analysis of stool samples from patients with the two common gastrointestinal diseases.
“The integration of these datasets allowed us to pinpoint key species as targets for functional studies in IBD and IBS and to connect knowledge of the etiology and pathogenesis of IBD and IBS with the gut microbiome to provide potential new targets for treatment,” wrote Arnau Vich Vila, of the University of Groningen, the Netherlands, and his coauthors. The report is in Science Translational Medicine.
Stool samples from 1,792 participants were analyzed: 355 from patients with IBD, 412 from patients with IBS, and 1,025 from the control group. The researchers found 24 bacterial taxa associated with both IBD and IBS and specific species that accompanied specific diseases, such as an abundance of Bacteroides in patients with IBD and Firmicutes in patients with IBS. In addition, their predictive model to distinguish IBD from IBS via gut microbial composition data [area under the curve (AUC) mean = 0.91 (0.81 to 0.99)] proved more accurate than did current fecal biomarker calprotectin [AUC mean = 0.80 (0.71 to 0.88); P = .002].
The authors acknowledged additional evidence that will be needed before these results can be translated to clinical practice, including supporting their described microbial pathways with metatranscriptomics and metabolomics data as well as functional experiments. They also observed that their predictive model will need to be validated through replication of their findings in patients with other gastrointestinal disorders or prediagnostic groups. They noted that their analysis benefited from being able to correct for confounding factors such as medication use, which is “essential for identifying disease-associated microbial features and avoiding false-positive associations due to changes in GI acidity or bowel mobility.”
One author reported receiving speaker fees from AbbVie and was a shareholder of the health care IT company Aceso BV and of Floris Medical Holding BV. Another author declared unrestricted research grants from AbbVie, Takeda, and Ferring Pharmaceuticals, is on the advisory boards for Mundipharma and Pharmacosmos, and has received speaker fees from Takeda and Janssen Pharmaceuticals. A third author declared consulting work for Takeda. The others reported no conflicts of interest.
SOURCE: Vich Vila A et al. Sci Transl Med. 2018 Dec 19. doi: 10.1126/scitranslmed.aap8914.
Thanks to shotgun metagenomic sequencing of gut microbiota, physicians are on track to more easily distinguish inflammatory bowel disease (IBD) from irritable bowel syndrome (IBS), according to an analysis of stool samples from patients with the two common gastrointestinal diseases.
“The integration of these datasets allowed us to pinpoint key species as targets for functional studies in IBD and IBS and to connect knowledge of the etiology and pathogenesis of IBD and IBS with the gut microbiome to provide potential new targets for treatment,” wrote Arnau Vich Vila, of the University of Groningen, the Netherlands, and his coauthors. The report is in Science Translational Medicine.
Stool samples from 1,792 participants were analyzed: 355 from patients with IBD, 412 from patients with IBS, and 1,025 from the control group. The researchers found 24 bacterial taxa associated with both IBD and IBS and specific species that accompanied specific diseases, such as an abundance of Bacteroides in patients with IBD and Firmicutes in patients with IBS. In addition, their predictive model to distinguish IBD from IBS via gut microbial composition data [area under the curve (AUC) mean = 0.91 (0.81 to 0.99)] proved more accurate than did current fecal biomarker calprotectin [AUC mean = 0.80 (0.71 to 0.88); P = .002].
The authors acknowledged additional evidence that will be needed before these results can be translated to clinical practice, including supporting their described microbial pathways with metatranscriptomics and metabolomics data as well as functional experiments. They also observed that their predictive model will need to be validated through replication of their findings in patients with other gastrointestinal disorders or prediagnostic groups. They noted that their analysis benefited from being able to correct for confounding factors such as medication use, which is “essential for identifying disease-associated microbial features and avoiding false-positive associations due to changes in GI acidity or bowel mobility.”
One author reported receiving speaker fees from AbbVie and was a shareholder of the health care IT company Aceso BV and of Floris Medical Holding BV. Another author declared unrestricted research grants from AbbVie, Takeda, and Ferring Pharmaceuticals, is on the advisory boards for Mundipharma and Pharmacosmos, and has received speaker fees from Takeda and Janssen Pharmaceuticals. A third author declared consulting work for Takeda. The others reported no conflicts of interest.
SOURCE: Vich Vila A et al. Sci Transl Med. 2018 Dec 19. doi: 10.1126/scitranslmed.aap8914.
Thanks to shotgun metagenomic sequencing of gut microbiota, physicians are on track to more easily distinguish inflammatory bowel disease (IBD) from irritable bowel syndrome (IBS), according to an analysis of stool samples from patients with the two common gastrointestinal diseases.
“The integration of these datasets allowed us to pinpoint key species as targets for functional studies in IBD and IBS and to connect knowledge of the etiology and pathogenesis of IBD and IBS with the gut microbiome to provide potential new targets for treatment,” wrote Arnau Vich Vila, of the University of Groningen, the Netherlands, and his coauthors. The report is in Science Translational Medicine.
Stool samples from 1,792 participants were analyzed: 355 from patients with IBD, 412 from patients with IBS, and 1,025 from the control group. The researchers found 24 bacterial taxa associated with both IBD and IBS and specific species that accompanied specific diseases, such as an abundance of Bacteroides in patients with IBD and Firmicutes in patients with IBS. In addition, their predictive model to distinguish IBD from IBS via gut microbial composition data [area under the curve (AUC) mean = 0.91 (0.81 to 0.99)] proved more accurate than did current fecal biomarker calprotectin [AUC mean = 0.80 (0.71 to 0.88); P = .002].
The authors acknowledged additional evidence that will be needed before these results can be translated to clinical practice, including supporting their described microbial pathways with metatranscriptomics and metabolomics data as well as functional experiments. They also observed that their predictive model will need to be validated through replication of their findings in patients with other gastrointestinal disorders or prediagnostic groups. They noted that their analysis benefited from being able to correct for confounding factors such as medication use, which is “essential for identifying disease-associated microbial features and avoiding false-positive associations due to changes in GI acidity or bowel mobility.”
One author reported receiving speaker fees from AbbVie and was a shareholder of the health care IT company Aceso BV and of Floris Medical Holding BV. Another author declared unrestricted research grants from AbbVie, Takeda, and Ferring Pharmaceuticals, is on the advisory boards for Mundipharma and Pharmacosmos, and has received speaker fees from Takeda and Janssen Pharmaceuticals. A third author declared consulting work for Takeda. The others reported no conflicts of interest.
SOURCE: Vich Vila A et al. Sci Transl Med. 2018 Dec 19. doi: 10.1126/scitranslmed.aap8914.
FROM SCIENCE TRANSLATIONAL MEDICINE
Key clinical point: Shotgun metagenomic sequencing data revealed key differences in gut microbiome composition between patients with inflammatory bowel disease and patients with irritable bowel syndrome.
Major finding: A predictive model to distinguish IBD from IBS based on gut microbial composition data [area under the curve (AUC) mean = 0.91 (0.81-0.99)] proved more accurate than did fecal biomarker calprotectin [AUC mean = 0.80 (0.71-0.88); P = .002].
Study details: A case-control analysis using shotgun metagenomic sequencing of stool samples from 1,792 individuals with IBD, IBS, or neither.
Disclosures: One author reported receiving speaker fees from AbbVie and was a shareholder of the health care IT company Aceso BV and of Floris Medical Holding BV. Another author declared unrestricted research grants from AbbVie, Takeda, and Ferring Pharmaceuticals, is on the advisory boards for Mundipharma and Pharmacosmos, and has received speaker fees from Takeda and Janssen Pharmaceuticals. A third author declared consulting work for Takeda. The others reported no conflicts of interest.
Source: Vich Vila A et al. Sci Transl Med. 2018 Dec 19. doi: 10.1126/scitranslmed.aap8914.