We report a case of advanced gastric cancer with right gastroepiploic vein tumor thrombus treated using preoperative S-1 plus cisplatin(CDDP)in which pathological complete response was achieved. A 78-year-old man was diagnosed with type 2 gastric cancer located at the greater curvature of the antrum, accompanied by right gastroepiploic vein tumor thrombus. Four courses of S-1 plus CDDP were administered as neoadjuvant chemotherapy. After 2 courses, computed tomography(CT) revealed the disappearance of the tumor in the right gastroepiploic vein thrombus. Distal gastrectomy with D2 lymphadenec- tomy was performed, and the diagnosis was pathological complete response(CR). Eight courses of S-1(100mg/day on days 1-28, followed by 2 weeks of rest)were administered as adjuvant chemotherapy. During the 1-year postoperative follow up, the patient showed no recurrence. An S-1 plus CDDP regimen can be a useful preoperative chemotherapy option for advanced gastric cancer with tumor vein thrombus.

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