LDR prostate brachytherapy (seed or line source implantation) is a proven treatment for low to high risk localized prostate cancer (when the cancer is contained within the prostate).[4][5] Under a general anaesthetic, the radioactive seeds are injected through fine needles directly into the prostate, so that the radiotherapy can destroy the cancer cells. The seeds are permanently implanted, so they remain in place but gradually become inactive as the radioactivity decays naturally and safely over time.[6] Unlike traditional surgery, LDR brachytherapy requires no incisions and is normally carried out as a day case procedure.