Consideration of malignant tumor is usually given preliminary diagnosis by the doctor based on the patient’s clinical presentation, imaging examination, blood chemistry and pathological examination, because the doctor will give the corresponding diagnosis only when he/she finds that the patient’s tumor grows in a way that is invasive to the surrounding organs and finds that there is a tendency of lymph node metastasis and distant organ metastasis. If pathological examination supports or considers malignancy, immunohistochemistry is required for further clarification. If immunohistochemistry suggests that the tumor is invasive to nerves or blood vessels, or synthesizes some species that are only synthesized by malignant tumors, such as proteins, then the diagnosis of malignancy can be clarified.