I've had Non-diabetic PN for ten years, resulting from a very small cancer in my spinal chord at T11. My balance is shot, because my doctors did not discover it until my B Cell Lymphoma was one and a half years old. It is very small, but it doesn't need to be big to interfere with nerves in the spinal chord. If it had been radiation treated within a couple of months, maybe I wouldn't be in a wheelchair.