Colorectal cancer (CRC) is the third most common cause of cancer death in men and women in the United States. The main goals of screening are to prevent carcinogenesis (via adenoma detection and removal) and detect cancer at an early, curable stage. CRC mortality is steadily dropping in the United States, partly because of greater screening utilization. However, nearly 1 in 3 average-risk people are not up to date with standard CRC screening recommendations. This review surveys a wide range of CRC biomarkers in various stages of development, which may offer attractive risk stratification tools; a few have reached the commercial stage. If widely accepted, these tools may contribute to shift CRC screening practices away from 1-step colonoscopy to a 2-step risk stratification process of predictive biomarker measurements followed by colonoscopy for lower-risk patients with a positive result. Such strategies could potentially increase the rate of CRC screening.
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