Participants for this study came from the Cancer Care Outcomes Research and Surveillance Consortium (CanCORS) data set, a prospective cohort study of newly diagnosed colorectal and lung cancer patients in the U.S. CanCORS is a joint collaboration between the National Cancer Institute and the Department of Veterans Affairs that aimed to examine ways in which patients, providers, caregivers, and health systems influence the experience of cancer care and outcomes Patients were identified between 2003 and 2005 through seven geographically diverse Can-CORS Primary Data Collection and Research Sites, representing a variety of delivery systems. The CanCORS data set has been shown to be equivalent to the Surveillance Epidemiology and End Results Registry in terms of national representativeness of the sample