In addition, erlotinib is also approved by the European Medicines Agency for the treatment of patients with locally advanced or metastatic NSCLC after failure of at least one prior chemotherapy regimen (with no mutation analysis requirement) as well as for switch maintenance treatment in patients with locally advanced or metastatic NSCLC with EGFR activating mutations and stable disease after first-line chemotherapy [8]. Here, EGFR is linked to non-small cell lung carcinoma.