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What are clinical trials?

Clinical trials are medical research studies involving people. They help us to understand more about cancer and how we treat it.

Why do we do clinical trials?

Clinical trials are important for learning more about cancer. You might also hear a clinical trial called a research study or clinical research. They all mean the same thing.

Clinical trials look at different areas.

Risks and causes

Trials look at how genetics, lifestyle and other factors can increase people's risk of cancer.

Preventing cancer

Researchers may look at whether a treatment or change in lifestyle can reduce the risk of developing cancer.

Screening

This research looks at possible tests to screen people before they have any symptoms. The focus might be on a screening test for the general population or for people with higher than average risk of cancer.

Diagnosing cancer

Trials investigate new tests, scans or procedures to improve diagnosis and pick up cancer earlier.

Treatments

A large area of cancer research aims to improve treatment. Trials look at new cancer drugs, or new ways to carry out radiotherapy or surgery. Some trials focus on different doses or combinations of treatment. Trials also create new treatments with fewer side effects and improve life for people with cancer.

Controlling symptoms or side effects

Trials might look at whether new medicines or complementary therapies can help to reduce treatment side effects.

Support and information

Some research wants to find out the best ways to support people with cancer and those close to them.

The 5 minute video below tells you more about clinical trials:

Trials are a part of routine cancer care. Taking part can involve different things. For example:

  • trying a new medicine or treatment

  • giving samples, such as blood or tissue

  • filling in a questionnaire

  • having a scan

You might have just one appointment, or you could be part of a trial for a few years.

What trials tell us

Many trials involve a new treatment or explore using an existing cancer treatment in a new way. These trials aim to find out if a new treatment:

  • is safe

  • has side effects

  • works better than the current test or treatment

  • affects quality of life

Some trials tell us more about the side effects, or what happens to a drug in the body.

Not all trials will result in new and better treatment. Results sometimes show that:

  • the treatment being tested does not work or

  • that it has side effects that are worse than with existing treatments.

It all adds to our knowledge of cancer and how best to treat it.

Researchers also want to look at the impact a treatment has on you and your life. For example, how often you have to travel to the hospital. Studies that look at the effect a treatment or procedure has on your day to day life are sometimes called quality of life studies. Many trials include a quality of life study.

Are trials safe?

Your safety is a very important part of all clinical trials. You are closely monitored by a team of doctors and nurses who are experienced in research. They follow strict rules and guidelines to protect you. But there are some risks with any clinical trial. The possible risks and benefits will be clearly explained to you.

If you have any concerns or problems, always talk to your research team. We have more information about safety in clinical trials.

The research team

A research team includes many specialists who work together to make sure the trial is safe and runs smoothly. All team members are trained in clinical research.

The team might include:

  • research nurses – your main point of contact during the trial

  • the principal investigator (PI) – the doctor in charge of the trial

  • research doctors – these might be consultants, registrars, and fellows

  • research coordinators and officers – they help organise and run the trial

  • laboratory staff – they look at blood and other samples

  • data managers – who collect and record trial information and results

  • clinical trial administrators – they support the running of the trial

  • research pharmacists – they prepare and manage trial medicines

The team may vary depending on the hospital or research centre. Some team members do research alongside their regular jobs. You’re most likely to meet research nurses and doctors during the trial.

Where you see the research team

If you join an early phase trial, your treatments and tests might take place in a special trial unit where you see the team regularly.

For late phase trials, you may have your treatment on a ward, or a day unit. So you will probably talk to the research team less often.

Your research team will give you contact details so you can contact them with questions or concerns about the trial.

Last reviewed: 21 May 2025

Next review due: 21 May 2028

Types of clinical trials

Phases of clinical trials

Randomised trials

Find a clinical trial

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What to ask your doctor about clinical trials.

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