Kag, I guess you would rather go to the doctor and shake his hand and say "I feel great, and I look great, so I'm free to go, right?", and the doctor would say, "yeh Kag, you must be cancer free, because you look healthy, that's good enough for me now get out of my office."
I'm trying to find your logic, not to belittle you, but people go to the car mechanic and check the engine and fluid levels, would they do this with the hood down? Why would you assume that someone would rather let the cancer become symptomatic and then go thru surgery, radiation, chemo or risk death?