Blocks the binding of HNRNPA1 to the intronic sequences flanking exon 9 of the PKM gene by competitively binding to the HNRNPA1 RGG-box motif . This inhibits inclusion of exon 9 and promotes inclusion of exon 10, suppressing formation of the PKM M2 isoform and promoting production of the M1 isoform . Also suppresses HNRNPA1-mediated processing of microRNA 18a (miR-18a) . Promotes MYC stability through interaction with IGF2BP2 .