James M. Slater, MD, whose determination to improve the quality of life for patients undergoing cancer treatment inspired him to use proton therapy for patient care and to champion and oversee creation of the world’s first hospital-based proton treatment center at Loma Linda University Health, died Dec. 26. He was 89. The James M. Slater, M.D. Proton Treatment and Research Center — which opened in 1990 — has since treated more than 18,000 patients from around the world, including foreign...