Patients are stratified according to age (≥ 60 vs < 60 years old), geographical location (United States of America, Canada, or Australia vs the rest of the world), extent of disease (independent of brain metastases, i.e., brain metastases are not considered in determining extent of disease) (intrathoracic disease only vs extrathoracic disease), and ECOG performance status (0 or 1 vs 2). Patients will be randomized to 1 of 2 treatment arms.