High early growth response 1 (EGR1) expression correlates with resistance to anti-EGFR treatment in vitro and with poorer outcome in metastatic colorectal cancer patients treated with cetuximab
Clin. transl. oncol. (Print)
; 19(6): 718-726, jun. 2017. tab, graf, ilus
Article
in English
| IBECS
| ID: ibc-162829
Responsible library:
ES1.1
Localization: BNCS
ABSTRACT
Purpose. Biomarkers, such as mutant RAS, predict resistance to anti-EGFR therapy in only a proportion of patients, and hence, other predictive biomarkers are needed. The aims were to identify candidate genes upregulated in colorectal cancer cell lines resistant to anti-EGFR monoclonal antibody treatment, to knockdown (KD) these genes in the resistant cell lines to determine if sensitivity to anti-EGFR antibody was restored, and finally to perform a pilot correlative study of EGR1 expression and outcomes in a cohort of metastatic colorectal cancer (mCRC) patients given cetuximab therapy. Methods. Comparative expression array analysis of resistant cell lines (SW48, COLO-320DM, and SNU-C1) vs sensitive cell lines (LIM1215, CaCo2, and SW948) was performed. The highest up-regulated gene in each resistant cell line was knocked down (KD) using RNA interference, and effect on proliferation was assessed with and without anti-EGFR treatment. Expression of the candidate genes in patients tumours treated with cetuximab was assessed by immunohistochemistry; survival analyses were performed comparing high vs low expression. Results. Genes significantly upregulated in resistant cell lines were EGR1 (early growth response protein 1), HBEGF (heparin-binding epidermal growth factor-like growth factor), and AKT3 (AKT serine/threonine kinase 3). KD of each gene resulted in the respective cells being more sensitive to anti-EGFR treatment, suggesting that the resistant phenotype was reversed. In the pilot study of mCRC patients treated with cetuximab, both median PFS (1.38 months vs 6.79 months; HR 2.77 95% CI 1.2-19.4) and median OS (2.59 months vs 9.82 months; HR 3.0 95% CI 1.3-23.2) were significantly worse for those patients with high EGR1 expression. Conclusion. High EGR1 expression may be a candidate biomarker of resistance to anti-EGFR therapy (AU)
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Collection:
National databases
/
Spain
Database:
IBECS
Main subject:
In Vitro Techniques
/
Gene Expression
/
Drug Resistance, Neoplasm
/
Cetuximab
/
Neoplasm Metastasis
Type of study:
Prognostic study
Language:
English
Journal:
Clin. transl. oncol. (Print)
Year:
2017
Document type:
Article
Institution/Affiliation country:
The Queen Elizabeth Hospital/Australia
/
University of Adelaide/Australia