Peter Rasmussen was always able to identify with his patients, particularly in their final moments. But he saw himself especially in a small, businesslike woman with leukemia who came to him in the spring of 2007, not long before he retired. Alice was in her late fifties and lived in a sparsely furnished farmhouse outside Salem, Oregon, where Rasmussen practiced medical oncology. Like him, she was stubborn and practical and independent. She was not the sort of patient who denied what was happening to her or who scrambled after any possibility of a cure, no matter what the cost.…