The Relationship Between Microsatellite Instability and Efficacy of Fluorouracil Based Adjuvant Chemotherapy in Gastric Cancer After Operation

The microsatellite instability status are definite to three type:MSI-H, MSI-L,and MSS. The gastric cancer patients who received D2 resection were included in 3 groups：MSI-H group， MSI-L group，and MSS group. All patient must be accept fluorouracil(5-FU) based adjuvant chemotherapy. We will analyze the relationship between MSI status and efficacy of 5-FU based adjuvant chemotherapy by observing the survival period of patients with different MSI status.