Gastrointestinal ulcers and cancer.
D000328:Adult; D003093:Colitis, Ulcerative / Q000150:complications*; D003110:Colonic Neoplasms / Q000209:etiology*; D006801:Humans; D010437:Peptic Ulcer / Q000150:complications*; D011230:Precancerous Conditions; D013997:Time Factors