KLK3 and Obesity: Univariate comparative analysis according to nutritional status (Table 2) showed that patients with obesity (PwO) were diagnosed at younger ages than patients without obesity (65.25 ± 6.96 vs. 67.82 ± 8.34 years, p = 0.022) and had significantly lower PSA values at diagnosis (10.13 (22.71) vs. 14.75 (34.73) ng/mL, p = 0.016).