A colonoscopy saved me from having full blown colon cancer. Some polyps were removed that tested positive.....I am so thankful I had mine done!! I have had skin cancer removed and live with an incurable form of leukemia (8 years now); so always willing to have any test done that need be. This week, I just had my 3rd. ultrasound to watch a spot they found last year in my gall bladder. So far it isn't growing....Amen!!! They do know it is not a stone.