PBRM1 and nonpapillary renal cell carcinoma: Consistent with these data, our own immunohistochemistry staining of BAF180 and HIF1α in ccRCC tumor tissues (BC0714a, US BioMax) found 7 HIF1α −/BAF180+ and 22 HIF1α+/BAF180− tumors out of a total of 66 ccRCC tumors.