The Protocol of A multi-center, randomized, parallel-group, controlled trial of retropetoneal laparoscopic radical nephrectomy and transperitoneal laparoscopic radical nephrectomy in the treatment of renal cell carcinoma

INTERVENTION: Experimental group:Laparoscopic radical nephrectomy was performed by transperitoneal approach;The control group:Laparoscopic radical nephrectomy was performed through retroperitoneal space; CONDITION: Renal cell carcinoma PRIMARY OUTCOME: Recurrence free survival ; SECONDARY OUTCOME: overall survival;The operation time;The amount of blood lost during the operation;Postoperative hospital stay;Cost from post‐operation to discharge;Perioperative complications; INCLUSION CRITERIA: 1. Patients and his families who volunteered to participate this study. And Patient is informed and has given written informed consent. 2.18 years of age and less than 75 years of age, both men and women; 3. Preoperative diagnosis is Limited renal cancer (stage T1 T3aN0M0), but should be excluded except for small renal cell carcinoma; 4. No previous history of other malignant tumors.