1 Alaska Women's Cancer Care, Anchorage, Alaska; the NRG Oncology Statistics and Data Management Center, the University of Pennsylvania, and NRG Oncology Philadelphia East, Philadelphia, Pennsylvania; the University of Alabama Birmingham Cancer Center, Birmingham, Alabama; the University of Oklahoma, Oklahoma City, Oklahoma; Memorial Sloan Kettering Cancer Center, Icahn School of Medicine at Mount Sinai, and Columbia University Medical Center, MU-NCORP, New York, New York; Duke University Medical Center, Durham, North Carolina; the University of New Mexico Health Sciences Center, Albuquerque, New Mexico; The Ohio State University Wexner Medical Center, Columbus, Ohio; the Louisiana State University Health Science Center, New Orleans, Louisiana; and the University of Texas Health Science Center at Houston/McGovern Medical School, Houston, Texas.