Stomach cancer can be divided into stage I, II, III and IV. Stage I is the earliest and stage IV is the latest. The early gastric cancer we often hear refers to stage I only, and the rest are called middle and late gastric cancer (also called progressive gastric cancer). The staging of gastric cancer in China at the time of diagnosis: stage I accounts for 4.1%, stage II accounts for 21.8%, stage III accounts for 31.7% and stage IV accounts for 42.4%. In the JGCA staging criteria, the 5-year survival rates of patients with stages I a, I b, II, IIIa, IIIb and IV are 100.0%, 96.9%, 79.3%, 54.2%, 16.8% and 11.2%, respectively; in the UICC TNM staging criteria, their 5-year survival rates are 100.o%, 96.9%, 75.4%, 51.8%, 18.4% and 10.5%.