KLK3 and neoplasm: The predictors for BCR were pathological stage T ≥ 3 (HR = 4.66 [95% CI: 2.81–7.73], p < 0.0001), positive surgical margin (HR = 4.18 [95% CI: 2.46–7.10], p < 0.0001), tumor volume ≥ 2.8 cc (HR = 3.10 [95% CI: 1.86–5.17], p < 0.0001), followed by PSA density ≥0.26 (HR = 2.06 [95% CI: 1.21–3.53], p = 0.0082), tumor located in the Posterior region (HR = 2.24 [95% CI: 1.07–4.65], p = 0.0314), tumor located in the PZ (HR = 3.28 [95% CI: 1.01–10.6], p = 0.0472).