Correlation between KRAS mutation status and response to chemotherapy in patients with advanced non-small cell lung cancer☆

Lung Cancer : Journal of the International Association for the Study of Lung Cancer
Megan L HamesLeora Horn

Abstract

KRAS mutations are the most commonly found mutations in patients with non-small cell lung cancer (NSCLC) adenocarcinoma histology. The clinical implications of KRAS mutations in patients with advanced NSCLC are not well defined. We sought to determine if there is a correlation between KRAS mutation status, response to cytotoxic chemotherapy, and survival in patients with metastatic or recurrent NSCLC. Patients with metastatic or recurrent NSCLC and tumor mutation analyses were analyzed for response to conventional chemotherapy. The presence or absence of tumor mutations was assessed with the SNaPshot assay, which detects >40 somatic mutations in eight genes, including KRAS. ALK fluorescence in-situ hybridization analysis was done separately. Associations between KRAS mutation status and response to chemotherapy and survival were assessed. We identified 80 patients with metastatic or recurrent NSCLC and a KRAS activating mutation, and we compared these patients to 70 patients who were pan negative (no detectable mutation by the SNaPshot assay and ALK negative). Patients with KRAS-mutant advanced NSCLC demonstrated a significantly shorter progression-free survival in response to first line chemotherapy (4.5 months versus 5.7 mont...Continue Reading

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