To identify what processes, at the molecular level, explain the reduction of IDA- induced apoptosis in U937 cells, we evaluate the expression of two important drug efflux pumps, MRD1, MRP1, in leukemic cells upon exposure to the single concentration of healthy-EVs, new case AML-Evs, and relapsed AML-EVs (30 μg/mL). The gene discussed is ABCC1; the disease is acute myeloid leukemia.