RB1 and acute myeloid leukemia: In summary, our study reveals the following: (1) elevated miR-550-1 expression is a favorable prognostic indicator in AML, and in AML patients it is at least partially dysregulated due to the hypermethylation promoter; (2) miR-550-1 is able to promote apoptosis and inhibit proliferation via regulation of the WTAP/WWTR1/BCL-2 and WTAP/WWTR1/CDK6/Rb/E2F1 pathways in AML; (3) m6A modifications are important for regulating the ability of miR-550-1 to target WWTR1.