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Use of a High-Throughput Genotyping Platform (OncoMap) for RAS Mutational Analysis to Predict Cetuximab Efficacy in Patients with Metastatic Colorectal Cancer / Journal of the Korean Cancer Association, 대한암학회지
Article em En | WPRIM | ID: wpr-6996
Biblioteca responsável: WPRO
ABSTRACT
PURPOSE: Cetuximab demonstrates improved efficacy outcomes in patients with metastatic colorectal cancer (mCRC) harboring wild-type KRAS exon 2. Resistance to cetuximab is mediated by activating less frequent mutations in the RAS genes beyond KRAS exon 2. We performed extended RAS Mutational analysis using a high-throughput genotyping platform (OncoMap) and evaluated extended RAS analysis for predicting cetuximab efficacy in patients harboring wild-type KRAS exon 2 tumors following Sanger sequencing. MATERIALS AND METHODS: Extended RAS analysis was performed on 227 wild-type KRAS exon 2 mCRC patients who received cetuximab as salvage treatment using OncoMap ver. 4.0. Targeted genes included exon 2, exon 3, and exon 4, both in KRAS and NRAS, and included BRAF exon 15. We assessed efficacy by the new RAS mutation status. RESULTS: The OncoMap detected 57 additional mutations (25.1%): 25 (11%) in KRAS exon 2 and 32 (14.1%) beyond KRAS exon 2. Survival differences were observed after dividing patients into the wild-type RAS group (n=170) and mutant RAS group (n=57) using OncoMap. Progression-free survival was 4.8 months versus 1.8 months (hazard ratio [HR], 0.44; 95% confidence interval [CI], 0.32 to 0.61), and overall survival was 11.9 months versus 8.4 months (HR, 0.65; 95% CI, 0.47 to 0.88). CONCLUSION: Sanger sequencing is not sufficient for selecting candidates for cetuximab treatment. High-throughput extended RAS genotyping is a feasible approach for this purpose and identifies patients who might benefit from cetuximab treatment.
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Texto completo: 1 Base de dados: WPRIM Assunto principal: Neoplasias Colorretais / Éxons / Genes ras / Terapia de Salvação / Intervalo Livre de Doença / Sequenciamento de Nucleotídeos em Larga Escala / Cetuximab Tipo de estudo: Prognostic_studies Limite: Humans Idioma: En Revista: Cancer Research and Treatment Ano de publicação: 2017 Tipo de documento: Article
Texto completo: 1 Base de dados: WPRIM Assunto principal: Neoplasias Colorretais / Éxons / Genes ras / Terapia de Salvação / Intervalo Livre de Doença / Sequenciamento de Nucleotídeos em Larga Escala / Cetuximab Tipo de estudo: Prognostic_studies Limite: Humans Idioma: En Revista: Cancer Research and Treatment Ano de publicação: 2017 Tipo de documento: Article