In BCa, Han et al. showed that by interacting with DCGR8, miR-221/miR-222 maturation is positively affected by METTL3 overexpression, depending on the presence of m6A modifications, thereby reducing the expression of human chromosome 10 deletion phosphatase and genes of phosphate and tension homology deleted on chromosome 10 (PTEN), inhibiting the cancer-inhibiting effect of PTEN, and enhancing the proliferation of BCa cells [119]. This evidence concerns the gene METTL3 and cancer.