Understanding why cancer immunotherapy helps some people but causes side effects in others
The MANIFEST study wants to understand why immunotherapy, a cancer treatment that boosts your body's own immune system, helps some people very well while causing side effects in others. Researchers will collect samples like blood and tissue during your usual hospital visits, without changing your treatment. By studying these samples and your medical information, they hope to find patterns that explain why treatments work differently for people. The goal is to help doctors choose the best treatments and reduce side effects for cancer patients in the future. If you're an adult about to start immunotherapy, you might be asked to join, but it's completely your choice.
At a glance
What is this study about?
Immunotherapy is a type of cancer treatment that helps your body’s own defence system, called the immune system, find and fight cancer cells. It has really improved how we treat many types of cancer. However, it's not the same for everyone – some people get a lot of benefit, while others don't, and some experience side effects. Doctors currently find it hard to predict who will respond well and who might have problems.
The MANIFEST study aims to make sense of this. Researchers want to understand exactly why immunotherapy works for some and not for others, and why some people get unwanted side effects. They will do this by looking closely at samples like blood and tumour tissue, as well as medical information, from people who are having immunotherapy. By studying these things, they hope to find certain clues or 'patterns' that can explain these differences.
The knowledge gained from this study could be very valuable. It might help doctors in the future to better predict how a patient will react to immunotherapy. This could mean doctors can choose the most suitable treatment for each individual, personalising care more effectively, and potentially develop ways to prevent or manage side effects. This study is part of a bigger national effort in the UK to make immunotherapy treatments even better and more tailored to each person.
Key takeaways
- The MANIFEST study aims to understand why immunotherapy works differently for people with cancer.
- It's an 'observational' study, so your medical treatment will not change.
- Researchers will collect extra samples like blood and tissue during your normal hospital visits.
- The goal is to help doctors choose better treatments and reduce side effects for future patients.
- Taking part is completely voluntary and won't affect your care.
- The study is expected to start recruiting around 3,000 patients in 2026 across the UK.
Who may be eligible?
You might be invited to join the MANIFEST study if you are 18 years old or older and have been diagnosed with cancer. You'll also need to be starting immunotherapy treatment as part of your normal care or a different clinical trial.
Your hospital doctor or nurse might talk to you about the study if they think you fit the requirements. The study is running in several hospitals across the UK.
There are a few reasons why you might not be able to join. For example, if you have a medical condition that makes it difficult to understand or agree to take part, or if you can't follow the study's schedule for giving samples.
Could this study suit you?
Answer these quick questions to see if you may be eligible. This is a guide only — the research team makes the final call.
- Are you 18 years old or older?
- Have you been diagnosed with cancer?
- Are you about to start immunotherapy treatment?
- Can you understand and agree to take part?
- Can you attend your regular hospital appointments as needed?
What does participation involve?
If you agree to take part in the MANIFEST study, your cancer treatment won't change. You will still have all your usual hospital appointments and receive the same treatment recommended by your medical team. This is an 'observational' study, meaning researchers will just observe and collect extra information without changing your care.
During your routine hospital visits, researchers will collect extra samples and information. This might include taking extra blood samples when you're already having blood tests. They might also use leftover tumour tissue from any biopsies or operations you've already had. Sometimes, if you're having a new biopsy, you might be asked if you'd be happy to provide an extra small piece for research, but this is always optional.
You might also be asked to provide stool (poo) samples, as researchers are interested in how gut bacteria might affect treatment. If your type of cancer usually involves urine tests, you might be asked for a urine sample too. These samples could be collected at different times – for example, before starting treatment, during treatment, and if you experience any side effects. Researchers will also look at information from your medical records, like your diagnosis, scan results, and any side effects you experience. In some hospitals, they might also include patient questionnaires you already fill out as part of your regular care, to understand your symptoms and how you are feeling. Overall, you will be followed throughout your immunotherapy treatment and afterwards, and the study is expected to run for several years.
Potential risks and benefits
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Common questions
What is immunotherapy?
Immunotherapy is a cancer treatment that helps your body's immune system recognise and fight cancer cells.
Will my cancer treatment change if I join this study?
No, your treatment will not change. This is an observational study, meaning researchers will collect information without altering your care.
What kind of samples will be collected?
Researchers may collect extra blood samples, leftover tumour tissue, and sometimes stool (poo) or urine samples during your regular hospital visits.
Will I get any direct benefits from joining?
It's unlikely you'll benefit directly. The study aims to help future patients by improving our understanding of immunotherapy for cancer.
Can I leave the study at any time?
Yes, you can withdraw from the study at any point without giving a reason, and it won't affect your medical care.
How to find out more
Kate Brown
Always speak to your GP or specialist before deciding to take part in a study.
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