KLK3 and posterior cortical atrophy: Inclusion criteriaMen at least 18 years of age referred with clinical suspicion of PCa.Serum PSA ≤20 ng/mL.Fit to undergo all procedures listed in the protocol.Able to provide written informed consent.Exclusion criteriaPrior prostate biopsy.Prior treatment for PCa.Prior prostate MRI on a previous encounter.Contraindication to MRI.Contraindication to prostate biopsy.Unfit to undergo any procedures listed in the protocol.