miR-1271-5p inhibits AML cell proliferation and induces apoptosis. (A) Expression levels of miR-1271-5p in AML193 and OCI-AML2 cells transfected with miR-1271-5p inhibitor, mimic or NC were measured by reverse transcription-quantitative polymerase chain reaction. (B) Cell proliferation was determined in AML193 and OCI-AML2 cells transfected with miR-1271-5p inhibitor, mimic or NC by a Cell Counting kit-8 assay. (C) Cell cycle was analyzed in AML193 and AML2 cells transfected with miR-1271-5p inhibitor, mimic or NC by flow cytometry. (D) Cell apoptosis in AML193 and OCI-AML2 cells transfected with miR-1271-5p inhibitor, mimic or NC. Data are representative of three independent experiments and expressed as the mean ± standard deviation. *P<0.05 vs. the NC group. AML, acute myeloid leukemia; FACS, fluorescence activated cell sorter; miR, microRNA; NC, negative control.