Prostate cancer staging is used to evaluate the course of cancer spread in prostate patients and the likelihood of cure with localized therapies such as surgery or radiation. Typically prostate cancer staging is divided into four stages. It is mainly based on the size of prostate cancer, lymphatic metastasis and organ metastasis. Currently, TNM staging is commonly used, which is based on the size of the cancer mass, lymph node metastasis and whether there are distant organ metastases to make a comprehensive judgment. A brief description of the four stages of prostate staging is: Stage I: When prostate tissue is removed for other reasons (e.g., benign prostatic hypertrophy) it is discovered by chance that cancerous cells have been found in a small portion of the sample and that the cells closely resemble normal cells. This is a milder condition with a better prognosis. Stage II: More lumps appear in the prostate. Stage III: The tumor has spread through the prostate capsule and the mass can be felt on the surface of the gland. Stage IV: The tumor has invaded structures near the prostate capsule or has spread to lymph nodes or other organs. This staging approach is useful in guiding the treatment of the disease. stages I and II may be treated surgically as the cancerous tissue is confined within the localized prostate gland. Stages III and IV are mainly treated with hormone therapy, radiotherapy, chemotherapy and other comprehensive treatment means. Generally speaking, the earlier the staging, the better the treatment effect and the higher the survival rate. Clinical staging can usually be determined before the first treatment. The presence of the tumor is first determined by imaging and rectal examination, while once a biopsy is performed or the prostate cancer cell type is known through pathological examination, accurate pathological staging is performed after treatment. The combination of clinical staging and pathologic staging guides the treatment of prostate cancer in its later stages. Maximize the life expectancy of the patient.