1. (Inclusion Criteria of participants recruited from CPTD) Cancer and non-cancer participants recruited to the study must have either been enrolled in either the screening (cancer negative) or treatment (cancer positive) of the Centers for Medicare and Medicaid Services Cancer Prevention and Treatment Demonstration Project (CMS CPTD) (Protocol 2006-0419) or must be listed as a current patient from the provided MD Anderson Tumor Registry list. All participants must meet the CPTD eligibility criteria listed below.