The role of primary tumour sidedness, EGFR gene copy number and EGFR promoter methylation in RAS/BRAF wild-type colorectal cancer patients ... View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2017-07-25

AUTHORS

Laura Demurtas, Marco Puzzoni, Riccardo Giampieri, Pina Ziranu, Valeria Pusceddu, Alessandra Mandolesi, Chiara Cremolini, Gianluca Masi, Fabio Gelsomino, Carlotta Antoniotti, Cristian Loretelli, Fausto Meriggi, Alberto Zaniboni, Alfredo Falcone, Stefano Cascinu, Mario Scartozzi

ABSTRACT

BACKGROUND: The data from randomised trials suggested that primary tumour sidedness could represent a prognostic and predictive factor in colorectal cancer (CRC) patients, particularly during treatment with anti-epidermal growth factor receptor (EGFR) therapy. However, an in-deep molecular selection might overcome the predictive role of primary tumour location in this setting. METHODS: We conducted a retrospective analysis in which tumour samples from RAS/BRAF wild-type (WT) metastatic CRC patients treated with second-third-line irinotecan/cetuximab were analysed for EGFR gene copy number (GCN) and promoter methylation. Study objective was to evaluate the correlation of tumour sidedness, EGFR promoter methylation and EGFR GCN with clinical outcome. Median follow-up duration was 14.3 months. RESULTS: Eighty-eight patients were included in the study, 27.3% had right-sided CRC, 72.7% had left-sided CRC; 36.4% had EGFR GCN<2.12 tumour, 63.6% had EGFR GCN⩾2.12 tumour; 50% had EGFR promoter-methylated tumour. Right-sided colorectal cancer (RSCRC) were associated with reduced overall response rate (ORR) (4.2% for RSCRC vs 35.9% for left sided colorectal cancer (LSCRC), P=0.0030), shorter progression-free survival (PFS) (3.0 vs 6.75 months, P<0.0001) and shorter overall survival (OS) (8 vs 13.6 months, P<0.0001). EGFR GCN<2.12 tumours were associated with reduced ORR (6.2% for EGFR GCN<2.12 vs 39.3% for EGFR GCN⩾2.12 tumours, P=0.0009), shorter PFS (3.5 vs 6.5 months, P=0.0006) and shorter OS (8.5 vs 14.0 months, P<0.0001). Epidermal growth factor receptor-methylated tumours were associated with reduced ORR (9.1% for methylated vs 45.5% for unmethylated, P=0.0001), shorter PFS (3 vs 7.67 months, P<0.0001) and shorter OS (8 vs 17 months, P<0.0001). At multivariate analysis, EGFR GCN and EGFR promoter methylation maintained their independent role for ORR (respectively P=0.0082 and 0.0025), PFS (respectively P=0.0048 and<0.0001) and OS (respectively P=0.0001 and<0.0001). CONCLUSIONS: In our study, an accurate molecular selection based on an all RAS and BRAF analysis along with EGFR GCN and EGFR promoter methylation status seems to be more relevant than primary tumour sidedness in the prediction of clinical outcome during cetuximab/irinotecan therapy. However, these data need to be validated with future prospective and translational studies. More... »

PAGES

315

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/bjc.2017.178

DOI

http://dx.doi.org/10.1038/bjc.2017.178

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1086108561

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/28632725


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