It's impossible to predict with certainty whether colon cancer is present. I can say that, in general, polyps potentially turn into cancer in order of years.
So, if there is blood in the stool and changes in bowel habits, the only way to know for sure would be to repeat the
colonoscopy and biopsy any suspicious lesions.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin Pho, M.D.
KevinMD.com
Twitter.com/kevinmd