The Role of Pre-operative and Post-operative Circulating Tumor Cells in Gastric Cancer.

In resectable gastric cancer participants who received curative surgery, to early and more accurately detect peritoneal carcinomatosis or occult metastasis is important. Also, investigators will look at CTC numbers in different timings after operation, to investigate the possibility of early detection for peritoneal carcinomatosis or occult metastasis. Also, this study will correlate the relationship of CTC and participants' survival.

Inclusion Criteria:Enrolling 150 casesStage I or more advanced gastric cancer, pathology provedDiagnosed at age ≥ 20 yearsEnrolled before surgery at the General Surgery Department, both inpatient and outpatient services.Exclusion Criteria:Patient's refusalPoor compliance, unable to cooperate for blood sampling for CTC isolation as time schedule or clinical treatment or follow-upDifficult blood samplingNo more needs for CTCs evaluation, decided by clinicians.