A subset of esophageal squamous cell carcinoma patient-derived xenografts respond to cetuximab, which is predicted by high EGFR expression and amplification.

Abstract:

Background:Epidermal growth factor receptor (EGFR) is reportedly overexpressed in most esophageal tumors, but most targeted therapies showed no efficacy in non-selected patients. This study aims at investigating the adaptive cetuximab subset in a cohort of esophageal squamous cell carcinoma (ESCC) patient-derived xenografts (PDXs). Methods:A large panel of ESCC PDXs has been established. The copy number, mRNA expression and immunohistochemistry (IHC) of key EGFR pathways have been examined along with cetuximab response. A preclinical trial on a randomly selected cohort of 16 ESCC PDXs was conducted, and the genomic annotations of these models were compared against the efficacy readout of the mouse trial. Results:The trial identified that 7 of 16 (43.8%) responded to cetuximab (ΔT/ΔC <0 as responders). The gene amplification and expression analysis indicated that EGFR copy number ≥5 (P=0.035), high EGFR mRNA expression (P=0.001) and IHC score of 2-3 (P=0.034) are associated with tumor growth inhibition by cetuximab, suggesting EGFR may function as a single predictive biomarker for cetuximab response in ESCC. Conclusions:Overall, our results suggest that an ESCC subtype with EGFR amplification and overexpression benefits from cetuximab treatment, which warrants further clinical confirmation.

journal_name

J Thorac Dis

authors

Zhu H,Wang C,Wang J,Chen D,Deng J,Deng J,Fan J,Badakhshi H,Huang X,Zhang L,Cai J,Guo S,Qian W,Nie Y,Li Q,Zhao K

doi

10.21037/jtd.2018.09.18

subject

Has Abstract

pub_date

2018-09-01 00:00:00

pages

5328-5338

issue

9

eissn

2072-1439

issn

2077-6624

pii

jtd-10-09-5328

journal_volume

10

pub_type

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