RecruitingPhase 2Biological interventionA Biomarker Study in Men With Localized Prostate Cancer Treated With Aglatimagene BesadenovecPhase 2a, open-label, multi-center study evaluating biomarkers and biodistribution of aglatimagene besadenovec plus valacyclovir in men with localized, intermediate-risk prostate cancer who are planning to receive external beam radiation therapy (EBRT).