I recently attended the 2015 Colorectal Cancer Symposium at UMassMemorial Medical Center. Take away message is colonoscopy is so important. Everyone should have a screening colonoscopy at age 50, or earlier if you have risk factors for colorectal cancer.
Colonoscopy is one of the only cancer screening tests that also allows for treatment. Precancerous lesions and small tumors can be removed easily with colonoscopy.
Goal is to find the cancer early! The 5-year survival in US for colon cancer: