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Ref Type Journal Article
PMID (32796636)
Authors Riera P, Rodríguez-Santiago B, Lasa A, Gonzalez-Quereda L, Martín B, Salazar J, Sebio A, Virgili AC, Minguillón J, Camps C, Surrallés J, Páez D
Title Novel Somatic Genetic Variants as Predictors of Resistance to EGFR-Targeted Therapies in Metastatic Colorectal Cancer Patients.
Journal Cancers
Vol 12
Issue 8
Date 2020 Aug 11
URL
Abstract Text About 40% of RAS/BRAF wild-type metastatic colorectal cancer (mCRC) patients undergoing anti-EGFR-based therapy have poor outcomes. Treatment failure is not only associated with poorer prognosis but higher healthcare costs. Our aim was to identify novel somatic genetic variants in the primary tumor and assess their effect on anti-EGFR response.Tumor (somatic) and blood (germline) DNA samples were obtained from two well-defined cohorts of mCRC patients, those sensitive and those resistant to EGFR blockade. Genetic variant screening of 43 EGFR-related genes was performed using targeted next-generation sequencing (NGS). Relevant clinical data were collected through chart review to assess genetic results.Among 61 patients, 38 were sensitive and 23 were resistant to treatment. We identified eight somatic variants that predicted non-response. Three were located in insulin-related genes (I668N and E1218K in IGF1R, T1156M in IRS2) and three in genes belonging to the LRIG family (T152T in LRIG1, S697L in LRIG2 and V812M in LRIG3). The remaining two variants were found in NRAS (G115Efs*46) and PDGFRA (T301T). We did not identify any somatic variants related to good response.This study provides evidence that novel somatic genetic variants along the EGFR-triggered pathway could modulate the response to anti-EGFR drugs in mCRC patients. It also highlights the influence of insulin-related genes and LRIG genes on anti-EGFR efficacy. Our findings could help characterize patients who are resistant to anti-EGFR blockade despite harboring RAS/BRAF wild-type tumors.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
NRAS G115Efs*46 colorectal cancer predicted - resistant Cetuximab Clinical Study - Cohort Actionable In a retrospective analysis, NRAS G115Efs*46 was identified at a frequency of >1% in 3 of 23 patients with metastatic colorectal cancer who did not respond to anti-EGFR therapy (Erbitux (cetuximab), n=12 or Vectibix (panitumumab), n=11), and was associated with a lack of response (p=0.029) to EGFR-targeted therapy (PMID: 32796636). 32796636
NRAS G115Efs*46 colorectal cancer predicted - resistant Panitumumab Clinical Study - Cohort Actionable In a retrospective analysis, NRAS G115Efs*46 was identified at a frequency of >1% in 3 of 23 patients with metastatic colorectal cancer who did not respond to anti-EGFR therapy (Erbitux (cetuximab), n=12 or Vectibix (panitumumab), n=11), and was associated with a lack of response (p=0.029) to EGFR-targeted therapy (PMID: 32796636). 32796636