1.What type of tumor is renal pelvis cancer? What kind of people is it highly prevalent in? Is it related to smoking? Renal pelvis cancer is a kind of tumor occurring in the epithelium of renal pelvis or renal calyx, accounting for about 10% of all renal tumors. Most of them are migratory cell carcinomas, and a few are squamous carcinomas and adenocarcinomas, which account for about 15% of renal pelvic carcinomas, and their degree of malignancy is much higher than that of migratory cell carcinomas. Clinically, migratory cell carcinoma may appear sequentially or simultaneously in any part of the urinary tract covered with migratory epithelium. The age of onset is more than 40 years old, and men outnumber women by about 3:1. There is no obvious difference between the onset of left and right kidneys, and about 2~4% of the patients develop both sides at the same time. The incidence rate of renal pelvis cancer is obviously higher in people who have smoked for a long time. 2.What are the symptoms of renal pelvis cancer? Do they usually have hematuria? As a common malignant tumor of urinary system, renal pelvis cancer occurs in renal pelvis, ureter, bladder and urethra, and the chance of recurrence of tumor after surgery is high.70~90% of patients have painless hematuria, and a few patients have lumbar discomfort, hidden pain and distension caused by tumor obstructing the junction of renal pelvis and ureter. Occasionally, renal colic may be caused by obstruction of the upper urinary tract by blood clots or tumor exudates. It is less common to have a lumbar mass due to hydronephrosis caused by tumor growth or obstruction. There are also a small number of patients with symptoms of urinary tract irritation, manifested as urinary frequency, urinary urgency and urinary pain. Some patients in the middle and late stages will have systemic symptoms, such as emaciation, hypertension, loss of appetite, anemia, low fever, and so on.