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[Three Cases of Advanced Gastric Cancer with Peritoneal Dissemination Successfully Treated with S-1 and Docetaxel Combination Chemotherapy].

Case 1: A 74-year-old man underwent total gastrectomy for gastric cancer, but peritoneal dissemination(P1c)was con- firmed intraoperatively in July 2011. Postoperatively, S-1/docetaxel(DTX)combination chemotherapy was administered; after 32 courses of treatment, S-1 was continued as monotherapy. However, in November 2013, CT scan showed a portal vein tumor. We modified the chemotherapy regimen, but he died 3 years and 7 months after the operation. Case 2: A 77-year-old man underwent distal gastrectomy for gastric cancer with peritoneal dissemination(P1b)in September 2013. He was treated with S-1/DTX/trastuzumab(Tmab)combination chemotherapy. After 5 courses of treatment, S-1was continued as monotherapy until October 2015. He has since survived without recurrence. Case 3: A 75-year-old woman was diagnosed with gastric cancer with peritoneal dissemination(P1c)by laparotomy in September 2014. She was treated with S-1/DTX combination chemotherapy. After 23 courses of treatment, chemotherapy was discontinued according to the patient's wish. She died 2 years and 6 months after the surgery. We suggest S-1/DTX combination chemotherapy as an option for advanced gastric cancer with peritoneal dissemination.