PLAUR and acute myeloid leukemia: Once it was demonstrated that selected let-7 miRNAs are potentially able to reduce the expression of uPAR, the levels of these miRNAs were investigated in two AML cell lines: KG1 (FAB M0/M1) cells, which express low levels of uPAR, and U937 (FAB M5) cells, which express high levels of uPAR [6].