P-359 A novel concomitant NRAS and BRAF mutation in metastatic colorectal cancer

نویسندگان

چکیده

Target therapy in metastatic colorectal cancer needs the determination of KRAS, NRAS, and BRAF mutation status to identify patients resistant anti-EGFR treatment. RASgenes (KRAS+NRAS) are mutated 40-50% 5-10%; presence a double RAS is very rare phenomenon, which why mutations considered exclusive each other. Herein, we describe novel concomitant NRAS/BRAF series patients. A 800 carcinomas fixed paraffin blocks were screened for RAS/BRAF by RT-PCR Idylla™ automated system. All KRASmutation with KRAS Mutation Test, then only wild type NRAS-BRAF Test. Our was characterized 49.6% KRASmutations, 3.8% 3.7% mutationsintheBRAF gene. One patient identified inthe NRAS genes: G12C V600E/D BRAF. This had an immediate liver metastasis from moderately differentiated adenocarcinoma left colon; MSI immunohistochemistry analysis revealed competent mismatch repair proteins. The given folforinox + avastin during 3 months, Avastin+Xeloda as maintenance Fortunately, objective response chemotherapy stabilization one-year follow-up. question is: “Are really other”? It seems difficult answer: even if it’s event, it important search mutatedin specific

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KRAS, NRAS and BRAF Mutation Analysis in Metastatic Colorectal Cancer

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ژورنال

عنوان ژورنال: Annals of Oncology

سال: 2023

ISSN: ['0923-7534', '1569-8041']

DOI: https://doi.org/10.1016/j.annonc.2023.04.415