Your trial experience

Thank you for taking part

Thank you for taking part in the NHS-Galleri trial.

The NHS-Galleri trial is looking into whether using Galleri® blood test can help the NHS detect cancer early. Finding cancer early usually means people have more treatment options and better outcomes.

Galleri is a multi-cancer early detection blood test that can detect a ​‘signal’ shared by many different types of cancer in a sample of a person’s blood.

The NHS-Galleri trial is a research study to see how well the blood test works in the NHS alongside existing cancer screening. More than 142,000 people aged 50 to 77 registered to take part in the trial after receiving an invitation letter from the NHS.

As a trial participant, you were invited to three appointments over two years, about 12 months apart, to give blood samples. This part of the trial finished in 2024, and you will not be asked to attend any more appointments. However, the trial has not ended and you are still an important part of it. This is because the researchers are still collecting information about your health shared by the NHS and will continue to analyse it over the coming months and years. 

What did taking part involve?

As a participant in the NHS-Galleri trial, you were invited to three appointments over two years, about 12 months apart. At each appointment, you were asked to give a blood sample and fill in a short health survey.

Appointments were held at large mobile clinics and smaller mobile vans. Many large mobile clinics were based in supermarket car parks.

When you joined the trial, a computer randomly put you in the test group or the control group. This means that you had a 50:50 chance of having your samples tested using the blood test. People in the test group had their blood samples tested using the Galleri test. People in the control group had their blood samples stored.

Test results were only shared with people who had the blood test and had a cancer signal detected test result.

Changing your mind

Before agreeing to take part, you were given a copy of the Participant Information Sheet (available in English, Bengali, Gujarati, Punjabi and Urdu). This sheet explains what the study involves, how your information will be used, and your rights as a participant. 

Although you will not be asked to attend any more trial appointments, information about your health will still be shared by the NHS to help with the trial. Also, your blood samples might be used for other research in the future.

You can change your mind at any point about this data collection or your blood samples being stored. There are no consequences, and you do not have to give a reason why.

You can tell the trial team if you no longer want to be part of the trial. Any information and samples that have already been collected will be kept and used.