Hi - was this your primary doctor who gave you this advice? If this was not from an oncologist then I suggest you seek one, preferably a practice that is dealt with both breast and colon cancer. Having a precancerous polyp is not of great concern, and the general guidelines for your age are probably every 5 years. That's why they do colonoscopies. It's great that you started yours at 45 years. It is highly unlikely that the breast cancer is related at all with the polyp. And your breast cancer would not have spread to the colon if that is your concern. At any rate I think it would be good for you to see a different oncologist just to assuage your concerns so that you can feel better about moving forward