This is a phase II study design to assess the response and tolerability of preoperative docetaxel, cisplatin and capecitabine in patients with operable gastric cancer. Simon's two-stage design is used to calculate the sample size for this Phase II trial, using two levels of response rate, P0 (20%) and P1 (50%). Accordingly, 20 patients is required for this study; 8 patients will be accrued for the first stage followed by 12 more patients when three or more responses are observed during the first stage. The alpha level of the design is 0.04 and power is 0.86. Serum measurement of tumour's RUNX3 promoter hypermethylation will be performed prior to each treatment cycle to evaluate its role as a biomarker for treatment response.