KLK3 and adenocarcinoma: Inclusion:- Adenocarcinoma prostate- grade group 3 or less (Gleason 4 + 3 = 7 orless).- Staging T2-T3a,N0M0 (MRI or DRE staging allowed)- PSA < 25 ng/ml- Maximum prostate volume 70cc- IPSS <12 at baseline- WHO performance status 0 or 1Design:- Single center, single arm feasibility study- Dose: 60 Gy in 20 fractions- Planned sample size of 30 participants