Peter, I had full blocking tumor removed along with 1/3 of my colon two years ago. If I were you, I would not wait for the cancer to come back. To paraphrase Clint Eastwood, "do you feel lucky?" Gleevec is one of the few chemos to have any meaningful affect on cancer patients (lukemia), but at its best, it only prolongs life, thus, I would not consider Gleevec your "ace in the hole".
I suggest that you assume the worst, that is that your cancer will come back. Get your self well educated on the mechanics of your particular cancer, as well as the most widely accepted alternative protocols. Make aggressive lifestyle changes, and then expect the best. For two years, I have been on a strict nutritional program that includes juicing, high content of raw organics, and antioxidant suppliments. I feel great, and there is no evidence that the cancer has regained an advantage.