Osimertinib Recruiting Phase 2 Trials for Stage IA Non-Small Cell Lung Carcinoma AJCC v7 / EGFR (Epidermal Growth Factor Receptor) Exon 19 Deletion Mutation / Stage IA Non-small Cell Lung Cancer / Stage IB Non-Small Cell Lung Carcinoma AJCC v7 / Stage IIA Non-small Cell Lung Cancer / Stage IIIA Non-Small Cell Lung Cancer / EGFR NP_005219.2:p.T790M / Stage IIB Non-small Cell Lung Cancer / Stage IIA Non-Small Cell Lung Carcinoma AJCC v7 / EGFR NP_005219.2:p.L858R / Stage IIIA Non-Small Cell Lung Cancer AJCC v7 / Stage IIB Non-Small Cell Lung Carcinoma AJCC v7 / Stage I Non-Small Cell Lung Cancer / Stage II Non-Small Cell Lung Cancer / Stage I Non-Small Cell Lung Cancer AJCC (American Joint Committee on Cancer) v7 / Stage II Non-Small Cell Lung Cancer AJCC v7 / Stage IB Non-small Cell Lung Cancer Treatment