In a performance evaluation of [18F]DCFPyL PET/CT, in patients with recurrent PCa and low PSA levels, the detection rates were 63.6% (<0.2 ng/mL), 58.7% (0.2–0.49 ng/mL), 62.8% (0.5–0.99 ng/mL), 82.1% (1–1.99 ng/mL), and 91.7% (>2 ng/mL) [5], which were higher than for primary staging [90]. The gene discussed is KLK3; the disease is posterior cortical atrophy.