Are there natural remedies that can lower a colon cancer recurrence risk?

My father is 76 and had colon cancer removed last summer. They removed the lymph nodes just in case although the cancer had not spread. It was contained and hasn't had any problems. Through his first blood work test his count was a 2. The doctor said its ok, it is not a 4. What do I make of this? He was told by an oncologist that if it ever recurs he is not a candidate for chemo and radiation. He has too many other ailments such as diabetes 2, COPD, pacemaker, 100% blocked leg artery that has bypassed itself, on blood thinners and high blood pressure meds, etc. Is there something he can do naturally to keep it from reocurring elsewhere or is this 2 count normal?