BRAVE. You hear that word a lot when people are sick. It's all about the fight, the survival instinct, the courage. But when Dr. Elizabeth D. McKinley's family and friends talk about bravery, it is not so much about the way Dr. McKinley, a 53-year-old internist from Cleveland, battled breast cancer for 17 years. It is about the courage she has shown in doing something so few of us are able to do: stop fighting. This spring, after Dr. McKinley's cancer found its way into her liver and lungs and the tissue surrounding her brain, she was told she had two options.