From LiveScience:
Around four years ago, now 77-year-old John Gormly went for what was supposed to be a routine blood test. But the results were life-changing.
The test suggested Gormly had colon cancer, which a colonoscopy later confirmed was Stage 2, meaning the cancer had spread through the wall of the colon but not to his lymph nodes. Gormly was one of the first patients to take a newly approved test called Shield, which its makers say can detect colon cancer from a blood sample. After his diagnosis, Gormly had surgery to remove the tumor and was back to work within 10 days.