BAP1 and nonpapillary renal cell carcinoma: Figure 2D shows that the genetic alteration rate of BAP1 was found to be 13%, with gene deletions (deep deletion and shallow deletion) accounting for more than half of the copy number alterations in ccRCC samples (Figure 2E). Additionally, the mRNA expression level of BAP1 was found to be positively correlated with the copy number value (Figure 2F).