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Clin Cancer Res. 2019 Jan 1;25(1):134-141. doi: 10.1158/1078-0432.CCR-18-1324. Epub 2018 Aug 14.

Validation of miR-31-3p Expression to Predict Cetuximab Efficacy When Used as First-Line Treatment in RAS Wild-Type Metastatic Colorectal Cancer.

Author information

1
Paris Descartes University, Paris, France.
2
Department of Biology, Assistance Publique Hôpitaux de Paris, European Georges Pompidou, Paris, France.
3
INSERM UMRS-1147 Paris, France.
4
IntegraGen SA; 5, rue Henri Desbruères, Evry, France.
5
Department of Medicine III, University Hospital, LMU Munich, Munich, Germany.
6
Institute of Pathology, Paracelsus Medical University/Salzburg General Hospital (SALK), Salzburg, Austria.
7
Institute of Pathology, University of Munich, Munich, Germany.
8
eXYSTAT, Malakoff, France.
9
Department of Medicine III, University Hospital, LMU Munich, Munich, Germany. sebastian.stintzing@med.uni-muenchen.de.

Abstract

PURPOSE:

MiR-31-3p expression has been shown to be associated with response to anti-EGFR therapy. We investigated the predictive role of this biomarker in the FIRE-3 study population, including its ability to differentiate outcomes between patients receiving anti-EGFR and anti-VEGF therapy.

EXPERIMENTAL DESIGN:

MiR-31-3p expression was measured in primary tumors obtained from 340 patients with RAS WT mCRC enrolled in the FIRE-3 Trial. This included 164 patients randomized to receive FOLFIRI plus cetuximab (FOLFIRI+Cetux) and 176 to FOLFIRI plus bevacizumab (FOLFIRI+Beva). Patients were divided into subgroups defined by low or high miR-31-3p expression using a prespecified cut-off and by treatment arm. Analyses were performed to assess treatment efficacy by subgroup. Overall survival (OS) and progression-free survival (PFS) were analyzed using Kaplan-Meier curves and Cox regression models. Investigator-assessed objective response (iOR), early tumor shrinkage at 6 weeks (ETS), and centrally reviewed objective response (cOR) were analyzed using logistic regression models. The predictive value of miR-31-3p expression level was assessed through a treatment interaction test using multivariate models adjusted for potential confounding factors.

RESULTS:

Low miR-31-3p expressers benefited from cetuximab compared with bevacizumab for PFS [HR, 0.74; 95% confidence interval (CI), 0.55-1.00; P = 0.05], OS (HR, 0.61; 95% CI, 0.41-0.88; P < 0.01), iOR (OR, 4.0; 95% CI, 1.9-8.2; P < 0.01), ETS (OR, 4.0; 95% CI, 2.1-7.7; P < 0.01 and cOR (OR, 4.9; 95% CI, 2.3-10.5; P < 0.01) in multivariate analyses. There was no difference in outcomes for high expressers between treatment arms. MiR-31-3p expression level was predictive of treatment effect for PFS (P = 0.03), OS (P = 0.05), iOR (P = 0.02), ETS (P = 0.04), and cOR (P < 0.01).

CONCLUSIONS:

MiR-31-3p expression level was validated as a predictive biomarker of cetuximab therapy efficacy for patients with RAS WT mCRC.

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