Moreover, Han et al. found that METTL3 can enhance tumor growth of BCa through accelerating pri-miR221/222 maturation based on m6A-dependent mode (Han et al., 2019), while Gu et al. (2019) reported that METTL14 can inhibit bladder tumorigenesis through N6-methyladenosine of Notch1. This evidence concerns the gene METTL14 and neoplasm.