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See 1 citation in Clin Cancer Res 2016:

Clin Cancer Res. 2016 Jul 1;22(13):3260-7. doi: 10.1158/1078-0432.CCR-15-2400. Epub 2016 Feb 17.

The First-in-class Anti-EGFR Antibody Mixture Sym004 Overcomes Cetuximab Resistance Mediated by EGFR Extracellular Domain Mutations in Colorectal Cancer.

Author information

1
Cancer Research Program, IMIM, Hospital del Mar, Barcelona, Spain.
2
Cancer Research Program, IMIM, Hospital del Mar, Barcelona, Spain. Department of Pathology, Hospital del Mar, Barcelona, Spain.
3
Department of Medical Oncology, Hospital del Mar, Barcelona, Spain.
4
Cancer Research Program, IMIM, Hospital del Mar, Barcelona, Spain. Department of Medical Oncology, Hospital del Mar, Barcelona, Spain.
5
Department of Medical Oncology, Vall d'Hebron Institute of Oncology (VHIO), Barcelona, Spain.
6
Candiolo Cancer Institute - FPO, IRCCS, Candiolo, Torino, Italy. Department of Oncology, University of Torino, Candiolo, Torino, Italy.
7
Symphogen A/S, Ballerup, Denmark.
8
Department of Pathology, Hospital del Mar, Barcelona, Spain.
9
Merck-Serono, Darmstadt Germany.
10
Cancer Research Program, IMIM, Hospital del Mar, Barcelona, Spain. Department of Medical Oncology, Hospital del Mar, Barcelona, Spain. Universitat Pompeu Fabra, Barcelona, Spain.
11
Cancer Research Program, IMIM, Hospital del Mar, Barcelona, Spain. Department of Medical Oncology, Hospital del Mar, Barcelona, Spain. cmontagut@hospitaldelmar.cat.

Abstract

PURPOSE:

Approved anti-EGFR antibodies cetuximab and panitumumab provide significant clinical benefit in patients with metastatic colorectal cancer (MCRC). However, patients ultimately develop disease progression, often driven by acquisition of mutations in the extracellular domain (ECD) of EGFR. Sym004 is a novel 1:1 mixture of two nonoverlapping anti-EGFR mAbs that recently showed promising clinical activity in a phase I trial in MCRC. Our aim was to determine the efficacy of Sym004 to circumvent cetuximab resistance driven by EGFR ECD mutations.

EXPERIMENTAL DESIGN:

Functional studies were performed to assess drug-receptor binding as well as ligand-dependent activation of individual EGFR mutants in the presence of cetuximab, panitumumab, and Sym004. Cell viability and molecular effects of the drugs were assayed in cetuximab-resistant cell lines and in tumor xenograft models. Efficacy of Sym004 was evaluated in patients progressing to cetuximab that harbored EGFR mutation in the post-cetuximab tumor sample.

RESULTS:

Contrary to cetuximab and panitumumab, Sym004 effectively bound and abrogated ligand-induced phosphorylation of all individual EGFR mutants. Cells resistant to cetuximab harboring mutations in EGFR maintained sensitivity to Sym004, which was consistent with an effective suppression of EGFR downstream signaling, translating into profound and sustained tumor regression in the xenograft model. As proof-of-principle, a patient with a tumor harboring an EGFR mutation (G465R) following cetuximab therapy benefited from Sym004 therapy.

CONCLUSIONS:

Sym004 is an active drug in MCRC resistant to cetuximab/panitumumab mediated by EGFR mutations. EGFR mutations are potential biomarkers of response to Sym004 to be evaluated in ongoing large clinical trials. Clin Cancer Res; 22(13); 3260-7. ©2016 AACR.

PMID:
26888827
DOI:
10.1158/1078-0432.CCR-15-2400
[Indexed for MEDLINE]
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