 REVOLUTION will be a US multicenter observational registry in scope and governed by a steering committee of approximately 8 experts in NSCLC and outcomes research. The primary goal of the registry is characterizing patterns of use for NSCLC therapy. REVOLUTION will be a multicenter registry enrolling approximately 2,500 patients. Additional patients limited to those with EGFR mutations may be enrolled following the initial study period as needed to ensure adequate sample sizes needed to examine primary questions of interest in the EGFR mutant population. Patients will be enrolled over a three year period across approximately 25 geographically diverse academic as well as community based sites within the US. The five year follow-up period will ensure robust survival data for correlations with clinical, tumor, and treatment variables. 