A 54-year-old man underwent distal gastrectomy with D2 lymph node dissection in our institution in March 2017 due to the presence of advanced gastric cancer. The pathological diagnosis was signet ring, poorly differentiated, and moderate differentiated adenocarcinoma, which was pT4aN3aM0, pStage Ⅲc and HER2-negative. After surgery, he received adjuvant chemotherapy with S-1, however, he was diagnosed with dissemination and lymph node recurrence in June. Tumor marker, CEA level decreased after the introduction of the next treatment(capecitabine plus cisplatin), however the tumor marker level rose again in September, and the chemotherapy regimen was changed to weekly paclitaxel(PTX). Furthermore, ramucirumab was added to the weekly PTX regime in January 2018, as the tumor marker level rose again. One week after the last ramucirumab administration he visited our hospital with abdominal pain, and emergency surgery was performed after the diagnosis of a gastrointestinal perforation using CT. The surgery revealed dirty fluid and countless dissemination nodes throughout the abdominal cavity, and a small intestinal perforation on a white dissemination node was identified 70 cm proximal to the end of the ileum. We performed small bowel segmental resection and functional end-to-end anastomosis. No complications were observed, and an oral diet was able to be started after surgery; however, he was introduced to the best supportive care(BSC)as his general condition gradually deteriorated.