Abstract
The IC50 of TKIs is significantly increased when BCR-ABL+ K562 cell line is cultured in stroma conditioned media produced by BM mesenchymal cells. In particular, while the Imatinib IC50 in the stromal co-cultures was well above the in vivo through levels of the drug, the IC50s of second generation TKIs were still below their through levels. Moreover, we provide a formal comparison of the synergy between first and second generation TKIs with the JAK inhibitor Ruxolitinib to overcome BM stroma related TKI resistance. Taken together, our data provide a rationale for the therapeutic combination of TKIs and Ruxolitinib with the aim to eradicate primary BCR-ABL+ cells homed in BM niches.
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