BEX1 and neoplasm: High expression of RXRG was positively associated with luminal subtype-related biomarkers in both the whole cohort and ER-positive tumours, including ER-chromatin interaction regulator Forkhead box protein A1 (FOXA1; p < 0.00001) and human brain-expressed X-linked1 (BEX1; p < 0.00001).