Department of Genitourinary Medical Oncology, Division of Cancer Medicine, MD Anderson Cancer Center, Houston, Texas, USA. START Center for Cancer Care, San Antonio, Texas, USA. Department of Medicine, University of California Los Angeles (UCLA), Los Angeles, California, USA. Department of Internal Medicine, Section of Hematology and Oncology, Stephenson Cancer Center of the University of Oklahoma and Sarah Cannon Research Institute, Oklahoma City, Oklahoma, USA. Eli Lilly and Company, Indianapolis, Indiana, USA. Eli Lilly and Company, New York City, New York, USA. Sarah Cannon Research Institute/Tennessee Oncology, Nashville, Tennessee, USA.