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Repurposing EGFR Inhibitor Utility in Colorectal Cancer in Mutant and Subpopulations

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Date 2019 Apr 25
PMID 31015202
Citations 14
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Abstract

Background: EGFR is a major therapeutic target for colorectal cancer. Currently, extended testing identifies only nonresponders to EGFR inhibitors (EGFRi). We aimed to develop a mutation signature that further refines drug-sensitive subpopulations to improve EGFRi outcomes.

Methods: A prespecified, 203-gene expression signature score measuring cetuximab sensitivity (CTX-S) was validated with two independent clinical trial datasets of cetuximab-treated patients with colorectal cancer ( = 44 and = 80) as well as an dataset of 147 cell lines. The CTX-S score was then used to decipher mutated genes that predict EGFRi sensitivity. The predictive value of the identified mutation signature was further validated by additional independent datasets.

Results: Here, we report the discovery of a 2-gene (+) mutation signature that was useful in identifying EGFRi-sensitive colorectal cancer subpopulations. Mutant + tumors were more predominant in left- versus right-sided colorectal cancers (52% vs. 21%, = 0.0004), in microsatellite stable (MSS) versus microsatellite instable (MSI) cases (47% vs. 2%, < 0.0001), and in the consensus molecular subtype 2 versus others (75% vs. 37%, < 0.0001). Moreover, mutant + tumors had favorable outcomes in two cetuximab-treated patient-derived tumor xenograft (PDX) datasets ( = 0.0277, = 52; = 0.0008, = 98).

Conclusions: Our findings suggest that the and combination mutation may account for the laterality of EGFRi sensitivity and provide a rationale for refining treated populations. The results also suggest addition of + sequencing to extended testing that may directly increase the response rates of EGFRi therapy in selected patients.

Impact: These findings, if further validated through clinical trials, could also expand the utility of EGFRi therapies that are currently underutilized.

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