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A trial of cryotherapy and hormone therapy for prostate cancer that has come back after radiotherapy (CROP)
This trial looked at hormone therapy and cryotherapy for prostate cancer that has come back in your prostate gland after radiotherapy. The trial was supported by Cancer Research UK.
Doctors may treat prostate cancer that hasn’t spread to another part of the body with radiotherapy. But if the cancer comes back they are unsure of the best way to treat it. You may have one type of treatment called hormone therapy or something called cryotherapy. Cryotherapy uses freezing probes to kill cancerous tissue.
In this trial, the researchers compared hormone therapy with cryotherapy followed by hormone therapy.
The aims of the trial were to find out
- How well cryotherapy before hormone therapy works for men with prostate cancer that has come back after radiotherapy
- More about the side effects
Summary of results
The trial team found that it wasn’t possible to do this trial. They couldn’t open the trial at enough hospitals and it was difficult to get men to join.
The planned treatments in this trial were
- Cryotherapy followed by hormone therapy
- Hormone therapy
The men taking part in the hormone therapy group weren't going to have treatment straight away. They were monitored to begin with and would start hormone therapy when their blood level of a protein called PSA went up.
The trial aimed to recruit 540 men. It was going to run at a number of hospitals, but only 4 opened. The researchers screened 39 men to see if they were eligible to take part. They found that most of the men didn’t want to be randomised. In a randomised trial the people taking part are put into 2 treatment groups by a computer. Neither the men nor their doctor could decide which group they were in. Of the 28 men who were eligible,
- 7 agreed to be randomised
- 21 didn’t agree to be randomised
The trial team found that the men didn’t agree to be randomised because
- The researchers had difficulties explaining that the treatments worked as well as each other
- Most of the men wanted to have cryotherapy
- The men may have thought that having treatment straight away was better than waiting for treatment. Most of them didn’t find it acceptable that they would have to wait for treatment if they were randomised to have hormone therapy alone.
Unfortunately the trial had to close earlier than planned because of the recruitment problems.
We have based this summary on information from the team who ran the trial. The information they sent us has been reviewed by independent specialists (
How to join a clinical trial
Please note: In order to join a trial you will need to discuss it with your doctor, unless otherwise specified.
Professor Hing Y. Leung
Cancer Research UK
NIHR Clinical Research Network: Cancer
NHS Greater Glasgow and Clyde
This is Cancer Research UK trial number CRUK/10/048.