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Blood test can detect colon cancer. C1

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This Aug. 26, 2009 photo shows Dr. Pedro Jose Greer, right, preparing to do a colonoscopy at Mercy Hospital in Miami. Greer has made a career of offering treatment without regard to patients' ability to pay, and it's one reason he received a 2009 Presidential Medal of Freedom. (AP Photo/Lynne Sladky)

Blood test can detect colon cancer. C1

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