We have a patient being treated with HBO for radiation cystitis. He has completed 35/40 treatments. So far, he has done great, no further episodes of bleeding for the past 2 weeks. His urologist has asked, "What is the reoccurance rate after hyperbaric treatments?" I have explained that HBO has been proven to help to prevent reoccurance. Can anyone point me in the direction to find some recent studies that have been done? Thanks in advance.