Dr. Judah Folkman, a path-breaking cancer researcher who faced years of skepticism before his ideas led to successful treatments, died Monday in Denver. He was 74. .... Dr. Folkman, a professor at Harvard and director of the vascular biology program at Children’s Hospital Boston, is considered the father of the idea that tumors can be kept in check by choking off the supply of blood they need to grow. The approach is now embodied in several successful cancer drugs, most notably Avastin, by Genentech. “His vision and ideas literally changed the course of modern medicine,” said Dr. William Li, a...