The results of immunohistochemistry are usually available in a week or so, and the results of normal paraffin pathology are available in a week or so, and if immunohistochemistry needs to be continued, the results will not be fully available until about two weeks. For example, if a neuroendocrine tumor is considered to be of insulin origin, that is, insulinoma, insulin-labeled immunohistochemistry will be done, and if the test result is positive, the diagnosis of insulinoma can be made. It is also possible that after the nature of the tumor has been clearly diagnosed, immunohistochemistry can be used to give guidance on the next step of treatment, such as chemotherapy, and if it is more sensitive to certain drugs, it can be a correct guidance for the next step of treatment.