Prospective Observational Cohort Study

The goal of this observational study is to learn about the overall disease status, diagnostic and therapeutic modalities, and prognosis of patients with gastric cancer liver metastasis(GCLM) in China. The investigators divided the participants into three groups( three types) of gastric cancer liver metastasis based onChinese c-GCLM classification system.The main question it aims to answer is: 1. How long do patients with GCLM live? 2. How different treatment modalities (surgery, chemotherapy, immunotherapy, targeted therapy and others) affect patients' prognosis of three type? All participants will be tracked for their physical condition.