1.Why is cystoscopic follow-up needed after surgery for renal pelvis cancer? Migratory cell carcinoma seen clinically, especially renal pelvic carcinoma, may develop due to the shedding of tumor cells and implantation of the entire urinary tract, including the bladder. Although the surgery has removed the affected kidney, the full-length ureter and part of the bladder wall including the ureteral opening, the bladder is also a potential implantation site for pelvic tumors, and some patients will develop bladder tumors after radical surgery for pelvic cancer, so close cystoscopic follow-up is necessary. Patients with renal pelvis cancer should be followed up regularly by performing cystoscopy once every 3 months for more than 2 years. This method is helpful for early detection of bladder cancer that appears after surgery for renal pelvis cancer. 2.Is the prognosis of renal pelvis cancer good? The prognosis of renal pelvis cancer can be affected by factors such as surgical method, tumor stage and grading, lymphatic metastasis and vascular infiltration. Among the many factors affecting the prognosis of renal pelvis cancer, the differentiation degree and infiltration depth of tumor cells are the main predictive factors. The size of tumor is related to the malignancy degree and the length of time of occurrence of tumor. The current 5-year survival rate of radical surgery for renal pelvis cancer in China is about 84%, and that of non-radical surgery is about 51%. The 5-year survival rate is about 75% for G1, 55% for G2, and 27% for G3 renal pelvic cancer; squamous epithelial carcinoma and adenocarcinoma have poor prognosis. Regular follow-up after surgery and cystoscopy should be performed once every 3 months for more than 2 years to facilitate early detection of the possibility of recurrent bladder cancer after surgery for renal pelvis cancer. Therefore, attaching importance to the early detection of renal pelvis cancer, early diagnosis, timely radical nephrectomy and full-length ureterectomy, and regular follow-up after surgery are important factors to improve the survival rate of renal pelvis cancer patients. 3.How to prevent tumor recurrence after renal pelvis cancer surgery? The following measures may be beneficial to prevent recurrence of renal pelvic cancer after surgery: (1) Regular cystoscopy and bladder perfusion chemotherapy after surgery are important methods to prevent recurrence of renal pelvic cancer. Cystoscopy, once every 3 months for more than 2 years, is helpful for early detection of the possibility of recurrence of renal pelvis cancer after surgery; (2) adjuvant means such as radiotherapy, immunotherapy and Chinese medicine can be used after radical surgery for renal pelvis cancer to reduce the risk of tumor recurrence; (3) adjustment of patients’ dietary habits, prohibition of smoking, alcohol, smoked or moldy foods, and less use of foods containing nitrosamines, such as carrots and pumpkin, etc. . (4) Appropriate exercise regimen to maintain a healthy body condition.