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- W2798996943 abstract "Adaptive resistance to MEK inhibitors (MEK-Is) typically occurs via induction of genes for different receptor tyrosine kinases (RTKs) and/or their ligands, even in tumors of the same histotype, making combination strategies challenging. SHP2 (PTPN11) is required for RAS/ERK pathway activation by most RTKs, and might provide a common resistance node. We found that combining the SHP2 inhibitor SHP099 with a MEK-I inhibits proliferation of multiple cancer cells in vitro. PTPN11 knockdown/MEK-I had similar effects, while expressing SHP099-binding mutants conferred resistance, demonstrating that SHP099 was on-target. This combination was efficacious in xenograft and/or genetically engineered models of KRAS-mutant pancreas cancer and ovarian cancer and in wild-type RAS-expressing triple negative breast cancer. Biochemical studies show that SHP099 impedes SOS/RAS/MEK/ERK1/2 reactivation in response to MEK-Is and blocks ERK1/2-dependent transcriptional programs. SHP099 alone also inhibited RAS activation in some, but not all, KRAS-mutant lines. Hence, SHP099/MEK-I combinations could have therapeutic utility in multiple malignancies." @default.
- W2798996943 created "2018-05-07" @default.
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- W2798996943 date "2018-04-25" @default.
- W2798996943 modified "2023-10-15" @default.
- W2798996943 title "SHP2 Inhibition Abrogates MEK inhibitor Resistance in Multiple Cancer Models" @default.
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- W2798996943 doi "https://doi.org/10.1101/307876" @default.
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