Anti-EGFR monoclonal antibodies enhance sensitivity to DNA-damaging agents in BRCA1-mutated and PTEN-wild-type triple-negative breast cancer cells.

Abstract:

:Increased epidermal growth factor receptor (EGFR) expression in triple-negative breast cancer (TNBC) is recognized as a promising therapeutic target, specifically through the use of selective EGFR inhibitors combined with chemotherapies. TNBC is characterized by genetic instability that leads to increased sensitivity to cytotoxic agents. We analyzed the effect of anti-EGFR monoclonal antibodies (mAbs; cetuximab and panitumumab) in combination with chemotherapeutic agents (docetaxel, cisplatin, and epirubicin) on EGFR-expressing TNBC cell lines that have different mutation statuses for one oncogene (KRAS) and two tumor suppressor genes (PTEN and BRCA1). Both mAbs failed to improve the cytotoxic effect of chemotherapies in the KRAS mutant cell line (MDA-MB-231) and PTEN-null cell lines (HCC-1937 and MDA-MB-468). In contrast, mAbs combined with DNA-damaging agents (cisplatin or epirubicin) had a synergistic effect in the BRCA1-mutant cell line SUM-1315 (wild-type KRAS and PTEN). The reintroduction of wild-type BRCA1 into SUM-1315 cells abolished this synergism. The improved effect of combination therapy was associated with cell cycle arrest at G1 phase and inhibition of the phosphorylation of EGFR and ERK1/2 proteins. These results suggest that patients with BRCA1-associated TNBC without genetic alterations in the PTEN and KRAS genes may have improved therapeutic responses to anti-EGFR mAbs combined with DNA-damaging agents. © 2017 Wiley Periodicals, Inc.

journal_name

Mol Carcinog

journal_title

Molecular carcinogenesis

authors

El Guerrab A,Bamdad M,Bignon YJ,Penault-Llorca F,Aubel C

doi

10.1002/mc.22596

subject

Has Abstract

pub_date

2017-05-01 00:00:00

pages

1383-1394

issue

5

eissn

0899-1987

issn

1098-2744

journal_volume

56

pub_type

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