RecruitingPhase 3Drug trialPROSTATE-IQ: Parallel RandOmized STudy of Personalized Apalutamide Treatment and Evaluation to Improve Quality of Life in Post-Operative Radiation With Androgen Axis Suppression. A Phase III Multi-center Study for Men With Detectable PSA After Prostatectomy for Prostate Cancer.1. Personalize treatment for prostate cancer based on how aggressive the disease is and 2. Learn if apalutamide-based treatment can help to reduce fatigue and other side effects of treatment in participants who are being treated with radiation therapy for prostate cancer, as compared to standard therapy.