A higher number of lifetime prostate-specific antigen tests were associated with earlier-stage PCa (OR 0.91, p = 0.02, 95% CI 0.83–0.99), while higher abdominal circumference (OR 1.02, p = 0.05, 95% CI 1.00–1.03), lower social support (OR 2.34, p < 0.01, 95% CI 1.31–4.17), and having children (OR 2.67, p < 0.01, 95% CI 1.38–5.16) were associated with later-stage disease. This evidence concerns the gene KLK3 and posterior cortical atrophy.