[A Case of Advanced Neuroendocrine Cell Carcinoma of the Stomach Treated with S-1 and Cisplatin Chemotherapy].

A 69-year-old man presented to our hospital because of epigastric pain. A type 2 lesion was seen in the lesser curvature of the antrum of the stomach. A moderately differentiated adenocarcinoma(human epidermal growth factor receptor 2-negative) was diagnosed by biopsy. Abdominal computed tomography showed a mass shadow 52mm in diameter in the pyloric region invading the surrounding organs, but no evidence of distant metastasis. Chemotherapy with S-1 and cisplatin(SP therapy)was initiated because of a diagnosis of locally advanced gastric cancer. After 2 courses of chemotherapy, the tumor shrinkage rate was 70%, confirming that treatment was effective. However, severe skin disorders developed, precluding the continuation of chemotherapy. Staging laparoscopy showed no evidence of peritoneal dissemination, but invasion into the superior mesenteric vein was noted. The tumor was resected by pancreaticoduodenectomy with partial resection of the venous wall. Pathological examination of the resected specimens provided a definite diagnosis of neuroendocrine cell carcinoma. As of 1 year and 7 months after surgery, there has been no observation of metastasis or recurrence. SP therapy was suggested to be a useful regimen for preoperative chemotherapy in patients with locally advanced neuroendocrine cell carcinoma.