The PSA “grey-zone” (3–10 ng/mL) and the PTX3 “grey-zone” (2–6 ng/mL) had similar overall detection rates for GG1 PCa (25.1% vs. 24.6%, respectively) and csPCa (22.4% vs. 22.5%, respectively). The gene discussed is PTX3; the disease is posterior cortical atrophy.