A bladder with lymph node metastasis indicates a relatively late stage. Generally, bladder cancer without lymph node metastasis and confined to the inner mucosa of the bladder, etc., is staged relatively early. If invasion of bladder muscle or lymph node invasion has already occurred, the stage is relatively late. If metastasis occurs in other distant organs, such as non-bladder organs, liver, gallbladder, pancreas, spleen, or metastasis to the skull or bone, such cases are often end-stage bladder cancer. Therefore, when lymph node metastasis of bladder cancer occurs, it means that the malignancy of bladder cancer is relatively high and distant metastasis has occurred, and the prognosis of patients is relatively poor. The survival rate of patients will be lower than that of bladder cancer with non-lymph node metastasis. Also, bladder cancer with lymph node metastasis requires further radiation therapy. Radiotherapy can be used to control lymph node metastases and can improve the quality of life or prolong the survival rate of patients.