ABCB1 and acute myeloid leukemia: The frequencies of patients with AML with high expression levels of the ABCB1 gene were 34.8% (47/135) Mean ± SD (range) 0.97 ± 15(0.65–1.9) median (0.94) and 37.7% (51/135) Mean ± SD (range) 0.48 ± 15(0.23–0.6) medians (0.45) presented low levels.