Erlotinib Active Not Recruiting Phase 2 Trials for Stage IIIB Non-Small Cell Lung Cancer AJCC v7 / Adenosquamous Lung Carcinoma / Malignant Pleural Effusions / Minimally Invasive Lung Adenocarcinoma / Stage IIIB Lung Non-Small Cell Cancer AJCC v7 / Adenocarcinoma of the Lung / Stage IV Non-Small Cell Lung Cancer AJCC v7 / Stage IIIb Non-small Cell Lung Cancer / Bronchioloalveolar Carcinoma / Lung Adenosquamous Carcinoma / Stage IV Non-Small Cell Lung Cancer / Malignant Pericardial Effusion / Stage IV Lung Non-Small Cell Cancer AJCC v7 Treatment