Kidney cancer with a diameter of 25 cm belongs to at least T2b stage (stage II), and it is staged even later if local progression or metastasis occurs. Renal cancer is a malignant tumor disease originating from the epithelial system of renal parenchyma urinary tubules, which can be judged mainly by TNM staging. If the tumor is confined to the kidney and does not exceed 7cm, then it belongs to T1 stage. In addition, if the renal cancer tumor is more than 7cm, then it belongs to T2 stage, in which T2 stage can be divided into T2a and T2b stage, the former indicates that the diameter of the tumor is between 7cm-10cm, while the latter refers to the situation where the diameter area is larger than 10cm. If there is no combination of local progression (peripheral vascular/tissue infiltration, etc.), lymph node metastasis, distant metastasis, etc., it is stage II; if there is local progression without lymph node metastasis or distant metastasis, etc., it is stage III or IV; if there is a combination of regional lymph node metastasis without distant metastasis, it is stage III; if there is a combination of distant metastasis, it is stage IV. Patients should go to the hospital for examination in time to confirm the diagnosis of kidney cancer as early as possible and actively cooperate with doctors to prevent the condition from deteriorating.