We also assessed CYP2E1 expression in other types of AML (n = 22), CYP2E1 was clearly positive in seven (31.8%), focally/weakly in three (13.6%) and negative in 12 (54.6%), but the overall intensity of expression was significantly less than that of cases of AML with inv(16) (p < 0.001). This evidence concerns the gene CYP2E1 and acute myeloid leukemia.