(Photo courtesy of Huntsman Cancer Institute) Bradley R. Cairns (left), senior director of basic science at Huntsman Cancer Institute and professor and chair of oncological sciences at the University of Utah; with fellow researchers James M. Hotaling, MD and assistant professor of surgery at the U.; and predoctoral student Jingtao Guo. The trio and others published research Thursday that breaks new ground in describing the changes human sperm stem cells go through as they mature, shedding light on infertility and cancer.