Abstract:
:The role of KRAS, when activated through canonical mutations, has been well established in cancer1. Here we explore a secondary means of KRAS activation in cancer: focal high-level amplification of the KRAS gene in the absence of coding mutations. These amplifications occur most commonly in esophageal, gastric and ovarian adenocarcinomas2-4. KRAS-amplified gastric cancer models show marked overexpression of the KRAS protein and are insensitive to MAPK blockade owing to their capacity to adaptively respond by rapidly increasing KRAS-GTP levels. Here we demonstrate that inhibition of the guanine-exchange factors SOS1 and SOS2 or the protein tyrosine phosphatase SHP2 can attenuate this adaptive process and that targeting these factors, both genetically and pharmacologically, can enhance the sensitivity of KRAS-amplified models to MEK inhibition in both in vitro and in vivo settings. These data demonstrate the relevance of copy-number amplification as a mechanism of KRAS activation, and uncover the therapeutic potential for targeting of these tumors through combined SHP2 and MEK inhibition.
journal_name
Nat Medjournal_title
Nature medicineauthors
Wong GS,Zhou J,Liu JB,Wu Z,Xu X,Li T,Xu D,Schumacher SE,Puschhof J,McFarland J,Zou C,Dulak A,Henderson L,Xu P,O'Day E,Rendak R,Liao WL,Cecchi F,Hembrough T,Schwartz S,Szeto C,Rustgi AK,Wong KK,Diehl JA,Jendoi
10.1038/s41591-018-0022-xsubject
Has Abstractpub_date
2018-07-01 00:00:00pages
968-977issue
7eissn
1078-8956issn
1546-170Xpii
10.1038/s41591-018-0022-xjournal_volume
24pub_type
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