BRG1 is the gene encoding the SWI/SNF complex subunit that was found to be associated with human cancers after BAF250A/ARID1A Mutations in subunits of the SNF complex have been detected in BRG1 mutations in hereditary and sporadic high‐glucose ovarian small cell carcinoma, a rare, undifferentiated and aggressive cancer characterized by early onset, although uncommon, in which germline mutations and somatic inactivation of BRG1 have been observed, while no associated germline mutations have been reported for BRM.60 The gene discussed is ARID1A; the disease is ovarian small cell carcinoma.