Men with unfavorable intermediate-risk (UIR-PCa) or high-risk prostate cancer (HR-PCa) are often treated with definitive external beam radiotherapy (EBRT) plus androgen deprivation therapy (ADT). Treatment is frequently intensified by electively treating the pelvic lymph nodes (LN) with whole pelvis radiotherapy (WPRT), but practice patterns and the benefits of WPRT are not well defined.