Osimertinib Recruiting Phase 1 Trials for EGFR Exon 20 Insertion Mutation / EGFR NP_005219.2:p.L858R / EGFR NP_005219.2:p.G719X / Stage IV Non-Small Cell Lung Cancer AJCC v7 / EGFR NP_005219.2:p.L861Q / Recurrent Non-Small Cell Lung Carcinoma / Metastatic Lung Non-Small Cell Carcinoma / Stage IV Non-Small Cell Lung Cancer / EGFR T790M Mutation Negative / Recurrent Lung Non-Small Cell Carcinoma / EGFR Activating Mutation / EGFR NP_005219.2:p.T790M / EGFR Exon 19 Deletion Mutation Treatment