[Colitis Suggested to be Related to Nivolumab in a Gastric Cancer Patient with a History of Ulcerative Colitis: A Case Report].

We experienced a case in which long-term use of nivolumab in a patient with a history of ulcerative colitis led to disease control of gastric cancer. The case is a 77-year-old man. The patient had a history of ulcerative colitis and remained in remission on mesalazine 1500 mg/d.