EGFR and KRAS Mutations Predict the Incidence and Outcome of Brain Metastases in Non-Small Cell Lung Cancer.

Background: Lung cancer is the leading cause of brain metastases (BM). The identification of driver oncogenes and matched targeted therapies has improved outcome in non-small cell lung cancer (NSCLC) patients; however, a better understanding of BM molecular biology is needed to further drive the process in this field.

Methods: In this observational study, stage IV NSCLC patients tested for and mutations were selected, and BM incidence, recurrence and patients' outcome were assessed.

Results: A total of 144 patients (142 Caucasian and two Asian) were selected, including 11.27% with -mutant and 33.10% with -mutant tumors, and 57.04% patients had developed BM. BM incidence was more frequent in patients with mutation according to multivariate analyses (MVA) (Odds ratio OR = 8.745 [1.743-43.881], = 0.008). Among patients with treated BM, recurrence after local treatment was less frequent in patients with mutation (OR = 0.234 [0.078-0.699], = 0.009). Among patients with untreated BM, overall survival (OS) was shorter for patients with mutation according to univariate analysis (OR = 7.130 [1.240-41.012], = 0.028), but not MVA.

Conclusions: and mutations have a predictive role on BM incidence, recurrence and outcome in Caucasian NSCLC patients. These results may impact the routine management of disease in these patients. Further studies are required to assess the influence of other biomarkers on NSCLC BM.