Prostate cancer is the commonest cancer in men. Current treatments include
surgery to remove the whole prostate or radiotherapy of the whole prostate.
These radical treatments can treat the cancer effectively but often cause
unwanted side effects. Meanwhile widespread screening with prostate-specific
antigen has led to an increased diagnosis of localised prostate cancer; at the
same time, widespread use of abdominal imaging has led to increased detection of
renal masses. In response to demand for improved outcomes with reduced side
effects, focal therapy has emerged as an important procedure in managing both
prostate and renal cancers. It targets individual areas of cancer, reducing
unwanted side effects and the