SPP1 and kidney cancer: Five studies, including 2941 subjects, compared outcomes between hilar and non-hilar tumors [32,33,34,35,44]; one paper, assessing 31 patients, compared RAPN and OPN [37]; two articles, evaluating 178 subjects, compared RAPN with LPN [38,39]; one document from the French National Network of Research on Kidney Cancer compared the type of hilar control approach (off-clamp vs. on-clamp) in 1359 patients [36].