A Phase 2 Trial of Optimizing Platinum-Based Chemotherapy Based on ERCC1 Expression as First-Line Treatment in Patients With Locally Advanced or Metastatic Gastric Cancer

Inclusion Criteria: * 18y≤Age≤65y, male or female * KPS≥70 * Histologically confirmed adenocarcinoma of the stomach or gastro-oesophageal junction with inoperable locally advanced or recurrent and/or metastatic disease * At least one measurable lesion, according to the Response Evaluation Criteria in Solid Tumors (RECIST 1.1), assessed using imaging techniques (CT or MRI) * No prior anti-tumor treatment or an interval of at least 6 months from the last adjuvant chemotherapy, and an interval of at least 4 weeks from the last radical radiation therapy * No major organ disorder, with normal liver, kidney and heart function * Laboratory test must meet the following criteria: hemoglobin (HGB) ≥90g/L, neutrophil count ≥1.5×109/L, platelet count ≥100×109/L, creatinine clearance rate (CCr) ≥60ml/min, total bilirubin (TBil) ≤1.5 upper normal limitation (UNL), alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤2.5 UNL (For patients with liver metastasis, the AST/ALT must be ≤5.0 UNL), blood glucose ≤11.1 mmol/L * Life expectancy of at least 12 weeks * Signed informed consent * For women with child bearing potential, a negative serum or urine pregnancy test result should be obtained before enrollment Exclusion Criteria: * Progression from prior palliative treatment with capecitabine- or docetaxel-based regimen * Serious uncontrolled systemic illness or medical condition: congestive heart failure, unstable angina, history of documented myocardial infarction within 6 months, uncontrolled hypertension and high risk uncontrollable arrhythmias; Obvious neurological or mental abnormalities including mental disorder, epileptic dementia, which affect compliance; Uncontrolled acute infections; Uncontrolled peptic ulcer, diabetes or other contraindication for corticosteroid therapy * Inability to take or absorb oral medicine * Concurrent administration of any other investigational drug, or have been enrolled in other clinical trial with investigational drug treatment within the 30 days of start of study treatment * Presence of neuropathy ≥grade 1 according to NCI-CTCAE V4.0 * Hypersensitivity or known or suspicious allergic to any of the study drugs * Pregnant or lactated women * Unsuitable for the study or other chemotherapy determined by investigator