KLK3 and glycogen storage disease VI: Second, pretreatment RDW-CV value has an evidently positive correlation with serum PSA levels in patients with PCa19,21; therefore, the mean RDW-CV and RDW-SD values of gray area patients with PCa would, to a large extent, be lower than those of overall patients with PCa and may only be slighter higher than those of individuals without prostate (and hematological) diseases.