Intervention Trial Evaluating Focal Therapy Using High Intensity Focused Ultrasound for the Treatment of Prostate Cancer

Inclusion Criteria: * Histologically proven prostate cancer on trans-rectal or transperineal template prostate biopsies * Template biopsy: * unilateral disease (Gleason ≤4+3) * bilateral disease: presence of clinically significant cancer in both sides (Gleason ≤4+3) OR clinically insignificant disease with a burden of \>50% of biopsy cores taken on that side, OR bilateral clinically insignificant disease and \<50% of biopsy cores positive on any one side but with dominant disease burden on one side * Stage T1-T2cN0M0 disease, as determined by local guidelines (radiological T3a permitted) * Serum PSA ≤15 * Life expectancy of ≥10 years * Signed informed consent by patient * An understanding of the German language sufficient to understand written and verbal information about the trial and consent process Exclusion Criteria: * Men who have had androgen suppression/hormone treatment within the previous 12 months for their prostate cancer * Men with evidence of metastatic disease or nodal disease outside the prostate on bone scan or cross-sectional imaging * Men with an inability to tolerate a transrectal ultrasound * Men with latex allergies as the HIFU probe is covered with a latex condom sheath prior to insertion into the back passage * Men who have undergone prior significant rectal surgery preventing insertion of trans-rectal HIFU probe (decided on the type of surgery in individual cases) * Men who have had previous HIFU, cryosurgery, thermal or microwave therapy to the prostate. * Men who have undergone a Transurethral Resection of the Prostate (TURP) for symptomatic lower urinary tract symptoms within 6 months. These patients may be included within the trial if deferred from consenting and screening until at least 6 months following the TURP. * Men not fit for major surgery as assessed by a Consultant Anaesthetist * Men unable to have pelvic MRI scanning (severe claustrophobia, permanent cardiac pacemaker, metallic implant etc likely to contribute significant artefact to images) * Presence of metal implants/stents in the urethra * Presence of prostatic calcification and cysts (on transrectal ultrasound) whose location will interfere with effective delivery of HIFU therapy * Men with renal impairment with a glomerular filtration rate of \<35ml/min (unable to tolerate Gadolinium dynamic contrast enhanced MRI).