The present invention relates to a combination of botulinum toxin and hyaluronic acid for use in the radiation treatment of cancer. The present invention also relates to a method for treating prostate cancer in a human patient, whereby one or more tumours in the prostate are shrunk, inhibited and/or dissolved and the rectum is protected from a subsequent radiation treatment step. Furthermore, the present invention relates to one or more compounds selected from botulinum toxin, hyaluronic acid and a combination of botulinum toxin and hyaluronic acid for use in the treatment of prostate cancer in a human patient by a method whereby one or more tumours in the prostate are shrunk, inhibited and/or dissolved and the rectum is protected from a subsequent radiation treatment step.
