This is a non-inferiority, randomized controlled trial to compare the peri-operative, renal functional and oncologic outcomes of endoscopic robot-assisted simple enucleation(ERASE) and standard robot-assisted partial nephrectomy(RAPN) in the treatment of T1 renal cell carcinoma.

Simple enucleation (SE) consists of excising the tumor by blunt dissection following the natural cleavage plane between the peritumoral capsule and the renal parenchyma without removing a visible rim of healthy renal tissue, which appears to reserve more renal parenchyma without compromising oncologic safety, may be an alternative to standard partial nephrectomy (PN). Although published studies showed excellent long-term oncologic results, many urologists still consider SE an unsafe technique with a high risk of incomplete tumor excision. The aim of this study is to compare the peri-operative, renal functional and oncologic outcomes of endoscopic robot-assisted simple enucleation(ERASE) and standard robot-assisted partial nephrectomy(RAPN) in the treatment of T1 renal cell carcinoma.

Inclusion Criteria:

1. patients with sporadic, unilateral, newly diagnosed T1 presumed renal cell carcinoma
2. ECOG score <=1
3. RENAL score <=9
4. patients with normal contralateral renal function
5. patients giving consent to the participation in the current clinical trial

Exclusion Criteria:

1. intolerance of robotic surgery
2. metastastic renal cell carcinoma
3. RENAL score >=10
4. entry into collection system or hematuria
5. patients with a history of other renal diseases, such as urinary lithiasis
6. patients with a history of renal surgery

Mask to participant and outcomes assessor.