The core complex of canonical SWI/SNF CRCs is formed by one ATPase subunit: BRM or BRG1; two SWI3‐type proteins: BAF155 and/or BAF170 and one SNF5‐type INI1 protein.9 Subunits of SWI/SNF CRC were found to be dysregulated in ccRCC and other malignant cancers.10, 11, 12, 13, 14 Noteworthy, the loss of some SWI/SNF subunits was observed in undifferentiated/dedifferentiated urothelial cancers, mostly BCs.15 Here, SMARCB1 is linked to nonpapillary renal cell carcinoma.