The Efficacy of Oxaliplatin Plus S-1 for Treatment of Gastric Cancer

a Phase II Study of Oxaliplatin Plus S-1 (SOX) as First-line Treatment for Patients With Advanced Gastric Cancer

The purpose of this study is to determine the efficacy and safety of oxaliplatin and s1 as first-line treatment of advanced gastric cancer.

There was no evidence of standard chemotherapy for advanced gastric cancer (AGC) in China. Fluoropyrimidines and cisplatin have been widely used in a variety of combinations in the treatment of AGC. Capecitabine/cisplatin combination therapy showed an overall response rate (ORR) of 41- 55%, a median time to progression/progression free survival (TTP/PFS) of 5.6-6.3 months, and a median overall survival (OS) of 10.1-10.5 months. Though no studies have compared two oral fluoropyrimidines in combination with oxaliplatin, both S-1 and capecitabine appear to be comparable in terms of efficacy and safety. The investigators conducted a phase II trial of oxaliplatin combined with S-1 in the treatment of first-line AGC.

Inclusion Criteria:

• Histologically proven in operable advanced gastric adenocarcinoma (including adenocarcinoma of the gastrooesophageal junction) or relapse gastric adenocarcinoma
• Measurable lesion and/or non-measurable lesion defined by RECIST
• ECOG performance status ≦ 1
• Hgb ≧ 8g/dL, WBC 4000-12000/mm3, platelets ≧ 100,000/mm3
• Creatine ≦ upper normal limit (UNL)
• Total bilirubin ≦ 1.5 X UNL
• AST, ALT and ALP ≦ 2.5 x UNL
• Subjects must be able to take orally
• No prior chemotherapy
• Life expectancy estimated than 3 months
• Written informed consent

Exclusion Criteria:

• Pregnancy or lactation women, or women with suspected pregnancy or men with willing to get pregnant
• Known brain metastases
• History of hypersensitivity to fluoropyrimidines, oxaliplatin
• Active double cancer
• Treatment with any investigational product during the last 4 weeks prior to study entry
• Symptomatic peripheral neuropathy ≧ garde 2. by NCI-CTCAE ver.3.0
• Any previous chemotherapy or radiotherapy for AGC