4.7 Review

Current and future colorectal cancer screening strategies

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NATURE PORTFOLIO
DOI: 10.1038/s41575-022-00612-y

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This Review provides an overview of current CRC screening options worldwide, including colonoscopy and stool-based tests. It also highlights the key features of each modality and describes new screening tests under development.
Despite strong evidence of effectiveness, colorectal cancer (CRC) screening remains underused. Currently, there are several options for CRC screening, each with its own performance characteristics and considerations for practice. This Review aims to cover current CRC screening guidelines and highlight future blood-based and imaging-based options for screening. In current practice, the leading non-invasive option is the faecal immunochemical test (FIT) based on its high specificity, good sensitivity, low cost and ease of use in mailed outreach programmes. There are currently five blood-based CRC screening tests in varying stages of evaluation, including one that is currently sold in the USA as a laboratory-developed test. There are ongoing studies on the diagnostic accuracy and longitudinal performance of blood tests and they have the potential to disrupt the CRC screening landscape. Imaging-based options, including the colon capsule, MR colonography and the CT capsule, are also being tested in active studies. As the world attempts to recover from the COVID-19 pandemic and adapts to the start of CRC screening among people at average risk starting at age 45 years, non-invasive options will become increasingly important. Colorectal cancer (CRC) is a leading cause of cancer-related death worldwide and screening is useful for early diagnosis. This Review outlines currently available CRC screening options worldwide (including colonoscopy and stool-based tests). Key features of each modality and new screening tests under development are described.

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