There are about 50 types of immunohistochemical tests, including epithelial markers, mesenchymal markers, cell proliferation markers and oncogene protein tests of various tissues, which are the more common immunohistochemical tests. The purpose of immunohistochemical tests is to diagnose and differentiate diseases, and doctors can judge the treatment effect and prognosis of malignant tumors based on the corresponding test results, which is a necessary test for cancer patients. Currently, immunoassay technology mainly includes antigen-antibody reaction-related tests and immune cell tests, and the choice of which method to use depends on the needs of the clinician. It is recommended that patients should actively cooperate with doctors to improve all relevant examinations after suffering from the disease, so that doctors can determine the treatment method of the disease based on the examination results.