Erlotinib Active Not Recruiting Phase 1 / 2 Trials for Recurrent Non-Small Cell Lung Carcinoma / EGFR Exon 20 Insertion Mutation / Stage IV Non-Small Cell Lung Cancer / Recurrent Lung Non-Small Cell Carcinoma / EGFR Activating Mutation / Stage IV Non-Small Cell Lung Cancer AJCC v7 Treatment