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  • Inside Rebecca Alexander’s Awareness Campaign for Usher Syndrome

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What is a ‘liquid biopsy’ and how does it monitor colorectal cancer?

04:59

For patients who have already beaten colorectal cancer, a cutting-edge test called a liquid biopsy is giving advance warning in case the disease returns. TODAY’s Craig Melvin sits down with former pro golfer Charlie Rymer to learn what it means to him.