Perirectal spacing in prostate radiation: worth the cost?

Dr Gerald Chodak at Medscape talks about reducing side effects following radiotherapy of the prostate. One of the problems with radiation is that the rectum is approximating the prostate, and therefore there is a risk for rectal toxicity. An idea that has been around for a number of years is to inject an absorbable material into that space, thereby separating the rectum from the prostate and hopefully lowering side effects.