[irAE-Related Postoperative Anastomotic Stenosis Following Gastrectomy for Gastric Cancer].

Despite recent advances in chemotherapy with immune-checkpoint inhibitor(ICI), some patients may have to undergo surgery after the immune-related adverse events(irAE). We report here a case of a 61-year-old man who developed the irAE-related anastomotic stenosis after robotic gastrectomy for gastric cancer. Previously, he was diagnosed as double cancers of far-advanced hung cancer and gastric cancer. He was treated with ICI-based chemotherapy comprising CBDCA, PEM and pembrolizumab for lung cancer, and developed drug-induced pneumonia and dermatomyositis due to severe irAE. Stenosis was improved with steroid therapy. Until now, there has been no recurrence without symptoms in these 2 years.