• 772 cases of cancer occurred in a group of 13,756 Crohn’s disease patients.
• 2,331 cases of invasive cancer occurred in a group of 35,152 patients with ulcerative colitis.
• Crohn’s disease was weakly associated with gastrointestinal cancers and extraintestinal cancers.
• Hematologic malignancies, smoking-related cancers and melanoma were the most strongly associated cancers in Crohn’s disease.
• Association between ulcerative colitis and gastrointestinal and extraintestinal cancers were weaker than in Crohn’s disease.
• The risk of gastrointestinal cancer in IBD patients decreased over time, while the risk of extraintestinal cancer remained relatively stable.
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