Slow accrual has been problematic in many clinical trials, especially comparative studies of proton and photon radiation. In addition to proton facility limitation, issues of patient and institutional preferences impact trial accrual. We hypothesized patient engagement could inform the design of a comparative trial with potential for rapid and representative accrual. Previously, we detailed a patient engagement process that identified patient preferences for treatment outcomes and study design for a comparative study of proton and photon therapy in prostate cancer (COMPPARE). We tested the efficacy of this engagement and herein report the resulting design of COMPPARE and its accrual outcomes.
Based on patient engagement, COMPPARE was designed as a large prospective comparison of outcomes between parallel cohorts of prostate cancer patients treated pragmatically with protons or photons with a goal of rapid, representative, comparable proton therapy (PT) and intensity-modulated radiation therapy (IMRT) accrual.
Site activation required a median of 18 months rather than the planned six months and COVID-19 surges were associated with significant accrual depressions. However, 2524 IMRT and PT patients from 51 institutions were accrued in 52 months to COMPPARE, including 404 Black patients, comprising 16% of the study population, exceeding the goal of 10%.
Despite unanticipated delays due to site activation and COVID-19 surges, rapid representative accrual of the large COMPPARE cohorts suggests that a patient engagement process can be highly effective in designing a patient-centric clinical trial.
International journal of radiation oncology, biology, physics. 2026 Jul 29 [Epub ahead of print]
Nancy P Mendenhall, Curtis M Bryant, Aaron J Katz, Ronald Chen, Todd DeWees, Jenna Hobkirk, Cristina Bremer, Liza Winthrop Grammel, Charles Griggs, Robert Marckini, Ron Nelson, Virgil Simons, Folakemi T Odedina, Neha Vapiwala, Curtiland Deville, Amy M Crisp, Christopher G Morris
Department of Radiation Oncology, University of Florida College of Medicine, Jacksonville, FL. Electronic address: ., Department of Radiation Oncology, University of Florida College of Medicine, Jacksonville, FL., Department of Population Health, University of Kansas Medical Center, Kanas City, KS., Department of Radiation Oncology, University of Kansas Medical Center, Kansas City, KS., DeWStat LLC, Phoenix, AZ., University of Florida Health Proton Therapy Institute, Jacksonville, FL., COMPPARE Coordinating Center, Jacksonville, FL., Mayo Clinic Comprehensive Cancer Center, Jacksonville, FL., Department of Radiation Oncology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA., Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University School of Medicine, Baltimore, MD., Center for Data Solutions, University of Florida College of Medicine Jacksonville, Jacksonville, FL. Electronic address: ., Department of Radiation Oncology, University of Florida College of Medicine, Jacksonville, FL. Electronic address: .