MuTAR study, Phase II, open-label study of erlotinib (E) treatment in patients (pts) with locally advanced or metastatic non-small cell lung cancer (mNSCLC) who present activating mutations (MUT+) in the tyrosine kinase (TKI) domain of the epidermal growth factor receptor (EGFR), assessed the efficacy of 1L in Portuguese pts with mNSCLC EGFR Mut.