# Colon cancer screening. Which test is most effective? Tumor DNA tests from feces and blood. Part 2 of 2. 1-2 This page does not yet have an agent-readable markdown version. Canonical: https://diagnosticdetectives.com/products/colon-cancer-screening-which-test-is-most-effective-tumor-dna-tests-from-feces-and-blood-part-2-of-2-1-2