borderline significantp = 0.05
A multivariate model showed that the effect of EGFR mutation and advanced nodal stage continued to be strongly associated with BM (EGFR: HR 2.04, 95%CI 1.22–3.39, p = 0.006; N stage: HR 1.92, 95%CI 1.15–3.20, p = 0.01) while age became only borderline significant (p = 0.05).