KLK3 and cancer: Multivariate analysis of patients with low-risk PCa who met the criteria for very low-risk PCa (clinical stage T1c, PSA <10 ng/ml, PSA density ≤0.15 ng/ml/gm, biopsy Gleason sum ≤6, 2 or fewer positive cores on biopsy, 50% or less involvement of any core with cancer, and 12 or fewer cores sampled) [15] also showed that core length was not a significant prognostic factor for GSU.