Less to Hold - A Comparison of Bladder Toxicities (Side Effects) in Patients Undergoing Prostate Radiotherapy Between Patients Treated With Empty Bladder and Those on a Drinking Protocol.

Radical radiotherapy to the prostate is conventionally treated with a full bladder with the aim of minimising dose to the bladder and small bowel to prevent significant side effects. Tolerance of the bladder filling protocol varies depending on patients' baseline urinary function. It is not uncommon for some men to have "accidents" during treatment causing understandable distress. This can also extend the treatment time and cause knock on delays in the radiotherapy department. Several United Kingdom (UK) centres report treating with an empty bladder. The investigators carried out a feasibility study comparing treatment with full bladder to empty bladder to ascertain if the investigators can safely change our protocol to that of an empty bladder.