Immunohistochemistry is not done by drawing blood. It is done by repeating the tissue from the last pathology check to get the results. If the tumor is checked for a local mass, the pathology result is not a clear diagnosis and immunohistochemistry is needed to further classify it as well as to clarify the tumor type. The significance of immunohistochemistry is to clarify the type of tumor, the site of origin, the degree of malignancy, and whether distant metastasis can easily occur. It is also meaningful to guide the subsequent medication of the disease. The doctor will decide the examination items according to the type of disease.