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Learn MoreTargeted therapy studies with small molecules against kinases, such as spleen tyrosine kinase (SYK), are underway in patients with acute myeloid leukemia (AML) and show promising initial results. Identifying the potential mechanism of resistance and finding new drug combinations to overcome them, however, is essential for the long-term success of these targeted agents. Here, we conducted a genome-scale ORF resistance screen and identified activation of the RAS/MAPK/ERK signaling pathway as one major mechanism of resistance to SYK inhibition. This finding was validated in AML cell lines with innate and acquired resistance to a SYK inhibitor and in AML samples from patients who developed resistance to SYK inhibition. In order to circumvent this resistance, we demonstrate the synergistic activity of a MEK Inhibitor in combination with a SYK inhibitor in RAS mutated cells, as well as in entospletinib-resistant AML cells. SOURCE: Gabriela Alexe (galexe@broadinstitute.org) - Broad Institute
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