Adjusted associations with MGUS were as follows: α2-globulin (OR 1.12, 95% CI 0.83–1.50, p = 0.47), PCa status (OR 1.99, 95% CI 0.75–5.28, p = 0.17), NLR (OR 1.28 per unit, 95% CI 0.95–1.73, p = 0.10), fibrinogen (OR 1.004 per mg/dL, 95% CI 0.999–1.010, p = 0.14), age (OR 1.02 per year, 95% CI 0.96–1.09, p = 0.47), and PSA (OR 0.97 per ng/mL, 95% CI 0.92–1.03, p = 0.33). Here, KLK3 is linked to posterior cortical atrophy.