This is a randomized phase II multicenter controlled study of oxaliplatin, calcium folinate, and 5-fluorouracil (mFOLFOX7) as neoadjuvant chemotherapy for resectable advanced gastric cancer.

Hypothesis: Neoadjuvant chemotherapy may improve 5 year overall survival compared with the control.

The study hypothesis is that the 5 year survival rate will reach 35% from 25% when neoadjuvant chemotherapy is carried out. With the alpha value to be 0.05 and beta value to be 0.80 as well as 10 percent of patients' lost-of-followup, the sample size will be 263.

Inclusion Criteria:

• ECOG score 0-2
• Ambulatory males or females, aged 30-70 years.
• Histologically confirmed gastric adenocarcinoma, staged preoperatively AJCC/UICC stage III(T3N1,T2N2,T4N0,T3N2)and IVM0 and operable
• Life expectancy more than 3 months
• Give written informed consent prior to study specific screening procedures, with the understanding that the patient has the right to withdraw from the study at any time, without prejudice.
• Normal hepatic, renal, and bone marrow function (GPT<2 fold of upper limit value; WBC>4000/dl, Tbil<1.5mg/dl, Cr<1.5 fold of upper limit value)

Exclusion Criteria:

• Patients can not bear surgical procedure.
• Pregnant or lactating women or women do not agree conceptive procedures.
• Previous cytotoxic chemotherapy, radiotherapy or immunotherapy except corticosteroids, for the currently treated gastric cancer.
• History of another malignancy within the last five years except cured basal cell carcinoma of skin and cured carcinoma in-situ of uterine cervix.
• History of uncontrolled seizures, central nervous system disorders or psychiatric disability judged by the Investigator to be clinically significant precluding informed consent or interfering with compliance for oral drug intake.
• Clinically significant (i.e. active) cardiac disease e.g. symptomatic coronary artery disease, New York Heart Association (NYHA) grade II or greater congestive heart failure or serious cardiac arrhythmia requiring medication or myocardial infarction within the last 12 months.
• Organ allografts requiring immunosuppressive therapy.
• Serious uncontrolled intercurrent infections or other serious uncontrolled concomitant disease.
• Moderate or severe renal impairment: serum creatinine > 1.5 x upper limit of normal (ULN).
• Prior unanticipated severe reaction to fluoropyrimidine therapy (with or without documented DPD deficiency) or patients with known dihydropyrimidine dehydrogenase (DPD) deficiency.
• Hypersensitivity to platinum compounds or any of the components of the study medications.
• Received any investigational drug or agent/procedure, i.e. participation in another trial, within 4 weeks before randomization.
• Unwilling or unable to comply with the protocol for the duration of the study.