MCL1 and acute myeloid leukemia: cultured four venetoclax-resistant AML cell clones using the MOLM-13 and MV4-11 cell lines, and they found that in one of the venetoclax resistant cell lines MV4-11-VR, there was no increase of BCL2 family members (MCL1, BCL2, and BCL-XL), which suggests the existence of alternative modes of resistance acquisition.