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Int J Cancer. 2016 Feb 1;138(3):739-46. doi: 10.1002/ijc.29807. Epub 2015 Sep 18.

Influence of mRNA expression of epiregulin and amphiregulin on outcome of patients with metastatic colorectal cancer treated with 5-FU/LV plus irinotecan or irinotecan plus oxaliplatin as first-line treatment (FIRE 1-trial).

Author information

1
Department of Medicine III And Comprehensive Cancer Centre, University Hospital Grosshadern, University of Munich, Germany.
2
Institute of Pathology, University of Munich, Germany.
3
DKTK, German Cancer Consortium, German Cancer Research Centre (DKFZ), Heidelberg, Germany.
4
Institute of Medical Informatics, Biometry, and Epidemiology, University of Munich, Germany.
5
Klinikum St. Marien, Oncology, Amberg, Germany.
6
Onkologische Praxis, Landshut, Germany.
7
Onkologische Schwerpunktpraxis in Kronach, Ambulantes Zentrum Für Hämatologie Und Onkologie, Kronach, Germany.
8
Klinikum Chemnitz, Chemnitz, Germany.
9
ClinAssess GmbH, Leverkusen, Germany.

Abstract

Our aim was to investigate the impact of EREG and AREG mRNA expression (by RT-qPCR) in patients with metastatic colorectal cancer (mCRC). In addition, epidermal growth factor receptor (EGFR) expression (by immunohistochemistry) as well as RAS-and PIK3CA-mutations (by pyrosequencing) were assessed. Tumors of 208 mCRC patients receiving 5-fluorouracil/leucovorin plus irinotecan (FUFIRI) or irinotecan plus oxaliplatin (mIROX) within the FIRE-1 trial were analyzed for mutations. Molecular characteristics were correlated with response, progression-free survival (PFS), overall survival (OS). mRNA expression was evaluated using ROC-analysis in 192 tumors (AREG high n = 31 vs. low n = 161; EREG high n = 89 vs. low n = 103). High versus low AREG expression was associated with PFS of 10.0 versus 8.0 months (HR = 0.62, 95% CI: 0.402-0.940, p = 0.03) and OS of 24.6 versus 18.7 months (HR = 0.72, 95% CI: 0.476-1.078, p = 0.11). High versus low EREG expression correlated with prolonged PFS (9.4 vs. 6.8 months, HR = 0.62, 95% CI: 0.460-0.846, p = 0.002) and OS (25.8 vs. 15.5 months, HR = 0.48, 95% CI: 0.351-0.657, p < 0.001). The positive prognostic effect of high EREG expression was confirmed in a multivariate analysis and was neither affected by EGFR expression nor by mutations of RAS- and PIK3CA-genes. EREG expression appears as an independent prognostic marker in patients with mCRC receiving first-line irinotecan-based chemotherapy.

KEYWORDS:

AREG; EREG; RAS; metastatic colorectal cancer

PMID:
26284333
DOI:
10.1002/ijc.29807
[Indexed for MEDLINE]
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