Nephrectomy (NSS) Nowadays, NSS is increasingly used for patients with T1a, T1b (maximal diameter ≤ 7 cm) and normal contralateral renal function, and the treatment results are similar to those of radical surgery [ 3, 4 ]. NSS is particularly suitable for tumors located at the upper and lower poles or margins, and the extent of parenchymal resection with NSS should be 0.5-1.0 cm from the tumor margins [ 5 ], and tumor enucleation is not recommended for sporadic renal cancer [ 6 ]. NSS indications [ 7, 8 ]: renal cancer occurs in patients with anatomic or functional isolated kidney, radical nephrectomy will lead to renal insufficiency or uremia, such as congenital isolated kidney, contralateral renal insufficiency or non-functioning, and bilateral renal cancer, etc. Relative indications for NSS [ 7, 8 ]: renal cancer contralateral kidney has some benign diseases, such as renal stone, chronic pyelonephritis or other diseases that may lead to deterioration of renal function (e.g., kidney stone). The indications and relative indications for NSS are not limited to the size of the tumor, but the indications for NSS are: clinical stage T1a (tumor ≤ 4 cm), tumor located in the periphery of the kidney, single asymptomatic kidney cancer, and normal function of the contralateral kidney [ 8 ].