Marcos Soriano On the third Wednesday in June, after a lunch he’d hardly managed to eat, Donald Mathison reported to the fifth floor of the 400 Parnassus Avenue Medical Building.  The weather had been unusually warm for the past several days, but inside the Oncology ward the air held an artificial chill, and gooseflesh rose on Donald’s arms as he crossed the threshold. He had a 3:30 p.m. appointment with the head of the department, and...