This study will offer men with intermediate risk prostate cancer who are suitable for, and interested in, prostate brachytherapy, the opportunity to be randomized between low dose rate (LDR) brachytherapy using permanent implantation of radioactive seeds (the current standard of care in BC) and high dose rate (HDR) or temporary brachytherapy which is also available as a standard of care in BC but only when used as a boost in addition with external beam radiotherapy. In addition, men will be offered the opportunity for testing the aggressiveness of their cancer using Cell Cycle Progression Gene Profile.