BCYRN1 and neoplasm: In tumor cells, hnRNP A2/B1 was found to serve as basic machinery, whereas hnRNP A2/B1 binds to Bcl-x pre-mRNA with the assistance of BC200, an ER-regulated lncRNA, to form a BC200-Bcl-x-hnRNP A2/B1 complex, resulting in the suppression of Bcl-xS expression and the promotion of Bcl-xL expression [13,14,15].