Osimertinib Recruiting Phase 2 Trials for Stage IIIB Non-Small Cell Lung Cancer AJCC v7 / EGFR Exon 20 Insertion Mutation / Stage IIIB Lung Non-Small Cell Cancer AJCC v7 / Stage IIIb Non-small Cell Lung Cancer / Stage IV Non-Small Cell Lung Cancer AJCC v7 / Recurrent Non-Small Cell Lung Carcinoma / Stage IV Non-Small Cell Lung Cancer / Recurrent Lung Non-Small Cell Carcinoma / Advanced Lung Carcinoma Treatment