Additional file 4: of Impact of epidermal growth factor receptor (EGFR) activating mutations and their targeted treatment in the prognosis of stage IV non-small cell lung cancer (NSCLC) patients harboring liver metastasis CastañónEduardo RolfoChristian ViñalDavid LópezInés FuscoJuan SantistebanMarta MartinPatricia ZubiriLeire EchevesteJosé Gil-BazoIgnacio 2015 Table S4. Univariate Regression Model for predicting OS (overall survival) in our clinical series.