LDR prostate brachytherapy (seed or polymer source implantation) is recommended as a treatment for patients whose cancer is at an early stage (cancer stages T1 to T2), and which has not spread beyond the prostate (localised disease).[1][11] Doctors use a combination of factors such as cancer stage and grade, PSA level, Gleason score and urine flow/bladder emptying tests to help them decide if a patient is suitable for LDR brachytherapy.