Just as the authors wrote, there was a pattern of higher observed NB-GFRs being underestimated by the NBGFR equation while lower observed NB-GFRs were overestimated by the NB-GFR equation, 2 which may be fixed by adding split renal function or parameters such as tumor characteristics including tumor complexity and contact surface area. Recently, a new simple model was reported that incorporates split renal function and renal-functional compensation provides a more accurate prediction of NB-GFR after radical nephrectomy. 4 On the other point of view, the surgeon's technique and surgical complications certainly affect postoperative renal function, so in a sense, the conclusion is destined to be individualized.