If colon cancer comes back, 80% of the time it comes back within 2 years of ending treatment. The first time mine came back, it had been 17 months after the last treatment, and it came back in my liver, whihc is very bad news. Surgery got it all, and I'm now 14 months post-chemo. If I make it to next July without a recurrance, I'll count myself as cured (though my doctor won't). If it comes back again, I'm likely toast.

Ending chemo is a strange thing. The medicine makes you terribly sick, but there is an odd comofrt in knowing you are taking strong action. When it ends, you feel like you're on your own. The doctors gave me no direction regarding continued preventative action, just continuted monitoring. I eat well (I have to, because lacking a substanital part of your colon makes things like fried food, red meat, fatty foods, etc. a luxury that results in hours in the bathroom), and phycially I am in the best shape of my life thanks to about 1000 miles last year and about 2600 miles this year on the bike. If I make it, it will be because my my bike.