S-1 combined with oxaliplatin as first line chemotherapy for Chinese advanced gastric cancer patients.

BACKGROUND/AIMS: To evaluate the efficacy and safety profile of S-1 combined with oxaliplatin (SOX) against unresectable advanced or metastatic gastric cancer.

METHODOLOGY

Oxaliplatin was administered intravenously at 100mg/m2 for two hours on day 1 and S-1 was administered b.i.d. at 80mg/m2/day on days 1-14 followed by a 7-day rest during the 3-week schedule.

RESULTS

All 51 patients were assessed for efficacy and adverse events. The response and disease control rates were 41% and 90%, respectively. The response rate was significantly improved in patients with ECOG performance status of no more than 1, elevated CEA levels or unresected primary cancers. The median follow-up time was 11.8 months, the median time to progression was 6.8 months, the median overall survival was 11.8 months and the 1-year survival rate was 47.4%. Patients with diffused type exhibited significantly decreased time to progression and overall survival. The grade 3/4 adverse events were hematological toxicities, including neutropenia (13.7%), thrombocytopenia (13.7%) and anemia (11.8%). The incidence of grade 3/4 non-hematological events was low (≤2%).

CONCLUSIONS

The SOX regimen (oxaliplatin, 100mg/m2 d1; S-1, 80mg/m2/day, b.i.d. d1-14, q3w) provided a favorable efficacy and safety profile in Chinese patients with advanced gastric cancer.