A study looking at ibrutinib for older people with mantle cell lymphoma (ENRICH)

Please note - this trial is no longer recruiting patients. We hope to add results when they are available.

Cancer type:

Blood cancers
Non-Hodgkin lymphoma




Phase 2

This study is comparing 2 treatments, ibrutinib and rituximab with chemotherapy and rituximab. It is for people aged 60 or older with mantle cell lymphoma. And it is for people who have not had any treatment.

Mantle cell lymphoma is a rare type of non Hodgkin lymphoma (NHL). This study is supported by Cancer Research UK.

More about this trial

Treatment for fit people who have mantle cell lymphoma and are under 65 years old is usually intensive chemotherapy followed by a transplant using your own stem cells.

But this is tough treatment and most older people are not able to have it. People who can’t have this treatment will have chemotherapy such as R-CHOP. But doctors are always looking to see if they can improve treatment.

In this study they are comparing 2 treatments.

  • Ibrutinib and rituximab (Mabthera)
  • Rituximab and chemotherapy

Ibrutinib is a type of biological therapy. It is a cancer growth blocker. It stops signals that lymphoma cells use to divide and grow.

Research has shown that ibrutinib can be used to treat mantle cell lymphoma when used with either chemotherapy or other drugs.

The main aim of this study is to see which treatment keeps the lymphoma under control the longest.

Who can enter

The following bullet points list the entry conditions for this study. If you are unsure about any of these speak with your doctor or the study team. They will be able to advise you.

You may be able to join this study if all of the following apply.

  • You have been diagnosed with mantle cell lymphoma
  • You have stage 2-4 lymphoma which can be measured on a scan and that needs treatment
  • You have not had any treatment for your mantle cell lymphoma apart from the following treatments to control symptoms radiotherapy to one area of your body or 1 weeks course of steroids
  • You are well enough to be up and about for at least half the day (performance status 0, 1 or 2)
  • You have satisfactory blood results
  • Your heart is working well enough to cope with one of the chemotherapy drugs called doxorubicin. You may be checked for this
  • You are willing and able to take medication to prevent a certain type of pneumonia
  • You are aged 60 or older

If you are a man taking part in the study, you must be willing to use reliable contraception during treatment if there is any chance that your partner could become pregnant.

You cannot join this study if any of these apply. You

  • Are considered well enough to have a stem cell transplant
  • Have lymphoma that has spread to the brain or spinal cord
  • Are currently having treatment with an experimental drug
  • Have had major surgery within 2 weeks of starting the study treatment
  • Have had a live vaccine within 4 weeks of starting the study treatment
  • Have had any other type of cancer in the last 2 years apart from basal cell skin cancer, squamous cell skin cancer or a type of cancer that was given a stage of being in situ such as carcinoma in situ of the cervix
  • Have an infection that needs treatment
  • Have Hepatitis B, Hepatitis C or HIV
  • Have any other serious medical condition or mental health problem that the study team think could affect you taking part

Trial design

This is a phase 2/3 study. The researchers need 400 people to join. Half will have ibrutinib and rituximab and half will have chemotherapy and rituximab.

It is a randomised study. The people taking part are put into treatment groups by a computer. Neither you nor your doctor will be able to decide which group you are in.

Diagram for ENRICH

Ibrutinib and rituximab (IR)
Ibrutinib is a capsule. You take 4 once a day. You take ibrutinib everyday you are in the study unless your mantle cell lymphoma gets worse.

You have rituximab as a drip into the vein once every 3 or 4 weeks for 6 months. After this you will probably have this as an injection into the skin every 2 months for 2 years. You may have it as a drip into the vein if your doctor thinks this is better for you.

Chemotherapy and rituximab
There are 2 possible chemotherapy treatments that can be given with the rituximab.

  • CHOP (cyclophosphamide, doxorubicin, vincristine and prednisolone)
  • Bendamustine

Your doctor will explain which one they think is best for you and why.

CHOP and bendamustine are given at different rates. You have

  • Rituximab and CHOP (R-CHOP) every 3 weeks
  • Bendamustine and rituximab every 4 weeks

Each 3 or 4 week period is called a cycle of treatment. You have up to 8 cycles of R-CHOP and up to 6 cycles of bendamustine and rituximab.

The chemotherapy drugs and rituximab are given as a drip into the vein. Prednisolone is a tablet. 

When you finish all the chemotherapy treatment you continue to have rituximab as an injection into the skin every 2 months for 2 years. You may have it as a drip into the vein if your doctor thinks this is better for you.

Everyone taking part in the study will be asked to complete a questionnaire on 4 different visits. The questionnaire will ask about side effects and how you’ve been feeling. This is called a quality of life study.

You will also be asked if you are willing to give some extra blood and bone marrow samples. These are for researchers to look at the number of lymphoma cells present before, during and after treatment. This is called Minimal Residual Disease (MRD) monitoring.

In the future it might help doctors know who would benefit from intensive treatment. You do not have to give these extra samples if you don’t want to. You can still take part in the study.

Hospital visits

You will see the doctors and have some tests before you start treatment. The tests include

You have both rituximab and chemotherapy in hospital but you shouldn’t need to stay overnight.

You have your 1st dose of rituximab quite slowly and you may be in the clinic for most of the day. You usually have subsequent doses over a shorter time and so won’t need to be at the hospital so long.

You see the doctors and have regular blood tests throughout your treatment.

And you have a CT scan

  • After 3 months of treatment
  • At the end of 6 months of treatment
  • Then every 6 months

You will have additional bone marrow tests if you have agreed to give extra bone marrow samples or you have mantle cell lymphoma in your bone marrow. The study team will tell you more about this.

When you have completed all the study treatment, you see the doctors every 3 months until you need further treatment.

Side effects

The most common side effects of ibrutinib are

We have information on

Recruitment start:

Recruitment end:

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.

Please note - unless we state otherwise in the summary, you need to talk to your doctor about joining a trial.

Chief Investigator

Professor Simon Rule

Supported by

Cancer Research UK
Experimental Cancer Medicine Centre (ECMC)
Haematological Malignancies Diagnostic Service (HMDS)
Janssen Pharmaceutical Companies
NIHR Clinical Research Network: Cancer
Peninsula Clinical Trials Unit, Plymouth University
University Hospitals Plymouth NHS Trust

Other information

This is Cancer Research UK trial number CRUK/14/026

Freephone 0808 800 4040

Last review date

CRUK internal database number:


Please note - unless we state otherwise in the summary, you need to talk to your doctor about joining a trial.

Around 1 in 5 people take part in clinical trials

3 phases of trials

Around 1 in 5 people diagnosed with cancer in the UK take part in a clinical trial.

Last reviewed:

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