There were 7 (2.4%), 8 (3.2%), 7 (2.8%), 22 (8.9%), and 39 (15.8%) patients with extra-pelvic only or combined pelvic and extra-pelvic sites of PCa recurrence at serum PSA levels of <0.5, 0.5–1.0, 1.1–2.0, 2.1–5.0, and 5.1–10.0 ng/mL, respectively. Here, KLK3 is linked to posterior cortical atrophy.