RB1 and neoplasm: Typical genetic alteration is the somatic mutation of SMARCB1 (formerly INI-1) or SMARCA4 (formerly BRG-1), retained immunohistochemical hallmarks of this tumor and demonstrated being an essential component of the ATP-dependent chromatin remodeling SWI/SNF complex, interacting with various pathways (p16-Rb pathway, Wnt-β-catenin pathway, sonic hedgehog signal pathway, polycomb pathway, MYCC, Aurora A) important for lineage specification, maintenance of stem cell pluripotency, and gene regulation (8).