RT Journal Article
SR Electronic
T1 Cell-type Specific Adaptive Signaling Responses to KRASG12C inhibition
JF Clinical Cancer Research
JO Clin Cancer Res
FD American Association for Cancer Research
SP clincanres.CCR-20-3872-A.2020
DO 10.1158/1078-0432.CCR-20-3872
A1 Haura, Eric B
A1 Solanki, Hitendra S
A1 Welsh, Eric A
A1 Fang, Bin
A1 Izumi, Victoria
A1 Darville, Lancia N.F.
A1 Stone, Brandon
A1 Franzese, Ryan
A1 Chavan, Sandip
A1 Kinose, Fumi
A1 Imbody, Denis
A1 Koomen, John M.
A1 Rix, Uwe
YR 2021
UL http://clincancerres.aacrjournals.org/content/early/2021/02/19/1078-0432.CCR-20-3872.abstract
AB Purpose: Covalent inhibitors of KRASG12C specifically target tumors driven by this form of mutant KRAS, yet early studies show that bypass signaling drives adaptive resistance. While several combination strategies have been shown to improve efficacy of KRASG12C inhibitors, underlying mechanisms and predictive strategies for patient enrichment are less clear. Experimental Design: We performed mass spectrometry based phosphoproteomics analysis in KRASG12C cell lines after short term treatment with ARS-1620. To understand signaling diversity and cell-type specific markers, we compared proteome and phosphoproteomes of KRASG12C cells. Gene expression patterns of KRASG12C cell lines and lung tumor tissues were examined. Results: Our analysis suggests cell-type specific perturbation to ERBB2/3 signaling compensate for repressed ERK and AKT signaling following ARS-1620 treatment in epithelial cell type, and this subtype was also more responsive to co-inhibition of SHP2 and SOS1. Conversely, both high basal and feedback activation of FGFR or AXL signaling was identified in mesenchymal cells. Inhibition of FGFR signaling suppress feedback activation of ERK and mTOR, while AXL inhibition suppress PI3K pathway. In both cell lines and human lung cancer tissues with KRASG12C we observed high basal ERBB2/3 associated with epithelial gene signatures while higher basal FGFR1 and AXL was observed in cells/tumors with mesenchymal gene signatures. Conclusions:Our phosphoproteomic study identified cell-type adaptive responses to KRASG12C inhibitors. Markers and targets associated with ERBB2/3 signaling in epithelial subtype and FGFR1/AXL signaling in mesenchymal subtype should be considered in patient enrichment schemes with KRASG12C inhibitors.