Background Treatment with thiopurines may be associated with different adverse effects, including acute pancreatitis. Risk factors for developing pancreatitis due to thiopurines in patients with Inflammatory Bowel Disease (IBD) are not clearly identified, with underlying genetic predisposition being a possible cause. Our aim was to evaluate predictive pharmacogenetic risk of pancreatitis in IBD patients treated with thiopurines. Methods IBD patients treated with thiopurines were identified from the prospectively maintained ENEIDA registry of the Spanish Working Group on Crohn's Disease and Ulcerative Colitis (GETECCU). We included as cases those patients who met the Atlanta diagnostic criteria for pancreatitis and had an imaging test that ruled out biliary origin. We included as controls those patients without pancreatitis after at least two years of treatment with thiopurines. Blood samples were collected, and DNA was extracted from leukocytes for all participants and, subsequently, pooled samples were sequenced. Sequencing of a panel of genes (CASR, CEL, CDLN2, CFTR, CPA1, CTRC, PRSS1, and SPINK1) was carried out in the NextSeq500 platform. Variants detected were classified as pathogenic, variants of unknown significance, and benign according to the American College of Medical Genetics and Genomics (ACMGG) guidelines. Results Ninety-five cases and 105 controls were enrolled, 57% were women. Pancreatitis was diagnosed at a median age of 39±13 years old. No patient had previous history of chronic or acute pancreatitis. There were no differences between thiopurine-treated patients with and without pancreatitis in age, sex, and age at IBD onset. We identified 81 benign variants (50 in cases and 67 in controls) and a total of 35 distinct rare pathogenic and unknown significance variants (10 in CEL, 21 in CFTR, 1 in CDLN2, and 3 in CPA1). Of these 35 variants (12 in cases and 18 in controls), 6 were classified as pathogenic (1 in cases and 5 in controls), belonging to the CEL and CFTR genes, and 30 as variants of uncertain significance (21 in cases and 22 in controls). There were no significant differences between the groups of cases and controls, both in totals and by genes. None of the cases or controls carried pancreatitis-predisposing variants within the CASR, CPA1, PRSS1, and SPINK1 genes. None of the analysed samples with pancreatitis carried a pathogenic CFTR mutation. Four different variants of unknown significance were detected in the CDLN and CPA1 genes. One of them was in the CDLN gene in a single patient with pancreatitis, and 3 variants in the CPA1 gene in 5 control individuals. Conclusion In patients with IBD, there is no predisposition to thiopurine-induced pancreatitis associated with genes known to cause pancreatitis.
Background Treatment with thiopurines in patients with Inflammatory Bowel Disease (IBD) may be associated with different adverse effects, including acute pancreatitis. Our aims were to evaluate the clinical presentation, severity and management of acute pancreatitis related to thiopurines in patients with IBD. Methods IBD patients with acute pancreatitis secondary to treatment with thiopurines for IBD were identified from the prospectively maintained ENEIDA registry of the Spanish Working Group on Crohn's Disease and Ulcerative Colitis (GETECCU). We included those patients who met the Atlanta diagnostic criteria and had an imaging test that ruled out biliary origin of pancreatitis. Investigators at each participating centre provided additional information on pancreatitis clinical evolution and management. Results We included 290 patients with pancreatitis in 34 centres; 54% were women, 84% had Crohn’s disease and 56% were smokers. Five (1.7%) had had pancreatitis before, but no patient met criteria for chronic pancreatitis. The median age at pancreatitis was 36 years (IQR 27-50). In 94% of cases, pancreatitis occurred after the first thiopurine drug. Azathioprine was the thiopurine used in 97% of cases (median dose 2.3 mg/kg/day (IQR 2-2.5)), and 6% were treated with mercaptopurine (1.5 mg/kg/day (IQR 1-1.5)). Pancreatitis was diagnosed after a median of 23 days (IQR 14-35) since the start of the treatment with thiopurines. 81% required hospitalization for pancreatitis for a median of 5 days (IQR 4-7). Four (1.4%) were severe pancreatitis, 16 (5.5%) moderate, and the rest mild, according to the Atlanta classification. No epidemiological or treatment factors were associated with the severity of pancreatitis. Thiopurine was withdrawn in all patients upon diagnosis of pancreatitis. After 2 months (IQR 1-28) of pancreatitis, 16 patients (5.5%) received thiopurines again (5 the same, 11 a different thiopurine), suffering a new episode of pancreatitis in 12 (75%) after a median of 12 days (IQR 5-34). Pancreatitis occurred in all smokers that were treated again with thiopurines (n=7), compared to 5 of the 9 (56%) non-smokers or former smokers (p=0.04, RR 1.8; 95% CI 1.1-3.2). Conclusion Acute pancreatitis secondary to treatment with thiopurines is mild in most patients, usually appearing during the first month of treatment. The reintroduction of thiopurines, although feasible in some cases, is not recommended due to the high risk of developing a new pancreatitis, especially in smokers.
Background An increased risk of lymphoma has been described in patients with Inflammatory Bowel Disease (IBD). The aims of our study were to determine the clinical presentation of lymphoma, previous exposure to immunosuppressive and biologic therapies, and the management and evolution of lymphomas in patients with IBD. Methods IBD patients with diagnosis of lymphoma from October 2006 to June 2021 were identified from the prospectively maintained ENEIDA registry of the Spanish Working Group on Crohn's Disease and Ulcerative Colitis (GETECCU). Investigators at each participating centre provided additional information on lymphomas. Results We identified 52 patients with lymphoma in 18 centres following 21,740 patients with IBD (2.4 cases of lymphoma/1,000 patients with IBD; 95% CI 1.8-3.1). 35 were men (67%) and 27 (52%) had Ulcerative Colitis. Non-Hodgkin lymphoma was the most common lymphoma (65%). The median age at diagnosis of lymphoma was 59 years old (IQR 48-67). 31 patients (60%) received thiopurines, and 20 (38%) an anti-TNF drug (one of them had not received thiopurines) before lymphoma diagnosis. Age at diagnosis of lymphoma was lower in those patients treated with thiopurines (53 ± 17 years old) and anti-TNF drugs (47 ± 17 years old) than in those patients not treated with thiopurines nor anti-TNF drugs before the diagnosis of lymphoma (63 ± 12 years old; p<0.05 for both). The most common signs were adenopathy or mass (38%). Most of patients were treated with chemotherapy (77%). Median follow-up after lymphoma diagnosis was of 57 months (IQR 39-102 months). After diagnosis of lymphoma, IBD treatment was changed in 30 patients (58%), and 3 (5.8%) patients received thiopurines and 8 (15%) biologics during follow-up. Those patients who required to be treated with immunosuppressants or biologic therapies after lymphoma diagnosis had an IBD flare more frequently than those patients without these treatments (75% vs. 20%; p=0.01). 5 cases had relapse of lymphoma (incidence of 1.7 cases/100 patient-years; 95% CI 0.7-4.0), with a median of 38 months (IQR 23-84 months) from the diagnosis. 9 patients (17%) died after 19 months (IQR 0-48 months). Relapse and mortality were not related with the type of IBD or lymphoma, sex, smoking habit nor with the use and duration of thiopurines or biologic therapies. Conclusion Most IBD patients with lymphoma had been treated with thiopurines and/or anti-TNF agents before lymphoma diagnosis, and these patients were younger at diagnosis of lymphoma than those not treated with these drugs. IBD treatment was usually changed after a diagnosis of lymphoma. Relapse and mortality of lymphoma were not related to the use and duration of thiopurines or biologic therapies.
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