A Study of Trastuzumab in Combination With Capecitabine and Cisplatin in Patients With Tissue HER2- But Serum HER2+ AGC

"* Trastuzumab intravenous administration at a loading dose of 8 mg/kg on day 1 followed by 6 mg/kg every 3 weeks~* Capecitabine oral administration at a dose of 1000 mg/m2 twice daily for 14 days every 3 weeks (from evening on day 1 to morning on day 15)~* Cisplatin intravenous administration at a dose of 80 mg/m2 on day 1"