Interestingly, we found that these HIF1A mutant ccRCC tumors express WT BAF180 gene.10 Also Sato et al.11 reported 17 HIF1α-negative ccRCC tumors and we found that 13 out of the 17 (76%) HIF1α-negative ccRCC tumors express BAF180 proteins (one-tailed Fisher's exact test: P=0.0245). The gene discussed is HIF1A; the disease is nonpapillary renal cell carcinoma.