Okay, good, do not be a cancer. Back to your assumption, genocide? Well, you can call it that if you want to, but that would mean the cancer can't fight back, and that is not correct. I call it war. Wars have been a constant in human history. Sometimes, the cancer wins, and the person dies. Sometimes, you are able to save the body, and the person gets to live... with permanent damage. You will only hope that next time the cancer shows up again, the person is not passive about it this time.