Why?
Possible benefits vs. possible risks
Useful questions to ask
How do I find out if I can take part?
Will I definitely get the trial treatment?
Why?
Why do people participate in clinical trials?
As a healthy volunteer:
- To help others and move medicine forward
- There may be payment for participating
As a patient volunteer:
- To help others
- To increase the number of treatment options available to you, including the newer ones
- To receive additional care and attention
Why would I be asked if I would like to participate in a clinical trial?
You may be asked to participate in a clinical trial if:
It has become available and could potentially offer new benefits to your current treatment
Your treatment options are limited
Your current treatment is not working and the next treatment option is palliative care
Possible benefits vs. possible risks
Although it is not guaranteed that the treatment being tested will work better than currently available treatment, there are some advantages of being in a trial that you might like to think about. In addition to the benefits, there are also risks associated with being in a clinical trial. The benefits and risks include:
Benefits | Risks |
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Useful questions to ask
If your doctor has suggested a clinical trial may be the next course of action for your treatment, or if you are thinking of taking part in a clinical trial as a healthy volunteer, you may find some of the questions listed below helpful to find out more about the trial and the treatment.
These types of questions will normally be included in the participant information sheet, which you will be given before joining a clinical trial.
Specific trial information
What the trial involves
Other things you may like to know
How do I find out if I can take part in a trial?
After signing a document called an informed consent form (ICF), you will be asked to have a number of screening tests. These will determine whether it is safe for you to take part in the clinical trial and will be based on the particular requirements (eligibility criteria) of the clinical trial you are involved in.
The tests you may be asked to have could include a physical examination, an ECG (electrocardiogram), blood tests, CT/MRI (computed tomography/magnetic resonance imaging) scan or pregnancy test.
Please visit Explaining the jargon, for more information about the eligibility criteria and the type of tests you may be asked to have.

Will I definitely get the trial treatment?
The answer to this question is unfortunately, no. Due to the design and safety of many clinical trials, and the need for unbiased results, many participants are not given the experimental treatment. This is because of guidelines called eligibility criteria and a concept known as randomisation.
If you match the eligibility criteria for a trial, it is also important to note that there is the possibility of you being given a placebo. In addition, most clinical trials are blinded, this means you will not know that treatment you have been given.