Inhibition of NF-κB sensitizes BCR-ABL1–transformed B lymphoblasts to TKIs. (A) BCR-ABL1/GFP– or BCR-ABL1/IκBαSR–transformed primary B-lymphoid progenitors (4 × 104 cells per well) were incubated with different concentration of imatinib as indicated. Cell viability was determined by MTS assay after 96 hours’ incubation. (B-C) Equal numbers of primary B-lymphoid progenitors transformed by BCR-ABL1/GFP, BCR-ABL1/IKKαKM, or BCR-ABL1/IKKβKM were incubated with different concentration of imatinib (B) or dasatinib (C) as indicated. Cell viability was determined by (3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide) assay after 96 hours’ incubation. Sigmoidal curves were fitted and IC50 values calculated by Prism software.