Re: Stage 3 colon cancer ...how can this be?
It does sound unusual that in three years a large tumour could develop. I do think some are more aggressive than others and is it possible that it was missed during the colonoscopy? I have heard of this happening. Sorry this has happened to your sister.
Husband dx July 2003, advanced rectal cancer stage 111C; myself dx July 2006 indolent lymphoma; husband dx February 2010, stage 2 prostate cancer.