Gastric Immunohistochemistry 7 items are different depending on the purpose of the test, mainly including CK, Syn, HER2, CD56, ki-67, NSE, TP, TS, NTRK, etc. It mainly depends on whether the test result is positive or negative. Gastric immunohistochemistry test is a kind of using immunological means to check the antigens in the cells of gastric tissues, which is used to diagnose gastric tumors, determine the type of tumors and determine the treatment plan. Gastric Immunohistochemistry 7 items can have different combinations depending on the purpose of the test, and the main items include CK, Syn, HER2, CD56, ki-67, NSE, TP, TS, NTRK and so on. When looking at the results of the 7 items of gastric immunohistochemistry, it is mainly determined by looking at whether they are negative or positive. For example, patients with squamous adenocarcinoma may be positive for CK5/6, CK8/18 and CK7, and patients with gastric neuroendocrine tumors may be positive for Syn, CD56 and NSE. The higher the Ki-67 positivity rate, the higher the sensitivity of patients to chemotherapeutic drugs; the higher the TP expression, the better the efficacy of 5-FU and capecitabine; high TS expression, the sensitivity of 5-FU chemotherapy decreases; NTRK fusion-positive patients with tumors can be treated with TRK inhibitors; HER2-positive patients can be treated with trastuzumab, and so on. When patients undergo gastric immunohistochemistry 7 tests, if they are positive, it is recommended that they consult a doctor in time and actively receive treatment to avoid delaying their condition.