HNRNPA2B1 and breast cancer: As demonstrated by immunoblotting with anti‐m6A antibodies to HA‐hnRNPA2B1 IP lysates, PCAT6 knockdown decreased the m6A‐modified RNA bounded by hnRNPA2B1 in hypoxic BC cells (Figure S5c, Supporting Information), suggesting PCAT6 facilitates the export of m6A‐modified RNA in hypoxic BC cells via hnRNPA2B1.