Among acute leukemias, mixed-lineage leukemia-rearranged (MLL-r) leukemia is associated with poor prognosis. Bromodomain and extra-terminal inhibitors (BETi) are promising agents for treatment of hematological malignancies; however, the mechanisms underlying sensitivity to BETi and biomarkers to predict sensitivity are yet to be clarified. Here, we established OTX015-resistant MLL-r cell lines (OTX015-R cells) and used them to explore therapeutic targets in BETi-resistant MLL-r leukemia.
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