The objective of this Clinical Sample Collection Study is to develop a biobank of appropriately collected plasma samples from colorectal cancer patients (i.e. AJCC/UICC stages 0, I, II, III) prior to therapeutic intervention, and from people reporting for colorectal cancer screening by colonoscopy, prior to bowel preparation. Samples in the colorectal cancer biobank will be used to: 1) assess the clinical performance of novel biomarkers for colorectal cancer screening; 2) develop improved processing workflows for the Epi proColon® test; 3) develop an automated Epi BiSKit workflow.