Han et al. (Han et al., 2019a) confirmed that METTL3 could affect the binding of the microprocessor protein DGCR8 to m6A methylated miRNAs, which in turn enhanced DGCR8 recognition and binding to pri-miRNA221/222 in BC, thereby increasing pri-miRNA processing and maturation. Here, METTL3 is linked to breast cancer.