Post-prostatectomy Radiation Therapy--Moderate Versus Ultra-hypofractionated (Also Known as Stereotactic Body Radiation Therapy [SBRT])

Inclusion Criteria:

* Men age ≥ 18 with histologically confirmed prostate cancer after radical prostatectomy with a PSA ≥ 0.1 ng/mL
* Interval between prostatectomy and planned radiation therapy start date ≥ 6 months
* KPS ≥ 70
* Patients with equivocal pelvic lymph nodes on imaging are eligible if the nodes are ≤ 1.5 cm in the short axis (equivocal evidence of metastatic disease outside of the pelvis on standard imaging requires documented negative biopsy)
* Ability to complete the EPIC-26 quality of life questionnaire
* Ability to obtain tissue from radical prostatectomy specimen for review by Michigan Medicine Pathology
* Ability to understand and the willingness to sign a written informed consent.

Exclusion Criteria:

* Prior history of pelvic radiation therapy
* History of moderate/severe or active Crohn's disease or ulcerative colitis
* History of bladder neck or urethral stricture
* Evidence of distant metastatic disease or nodal involvement beyond the common iliac vessels
* Initiation of androgen deprivation therapy with a LHRH / GnRH agonist or antagonist greater than 6 months prior to enrollment or receipt of any non-LHRH / GnRH agonist or antagonist androgen deprivation or anti-androgen therapy
* History of another invasive malignancy within the previous 3 years except for adequately treated squamous or basal cell skin cancer
* Any condition that in the opinion of the investigator would preclude participation in this study