Around 1 in 5 people diagnosed with cancer in the UK take part in a clinical trial.
A study to understand more about the growth and treatment of a rare type of non Hodgkin lymphoma (IELSG 26)
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This study looked at tissue samples and PET scans to learn more about ‘primary mediastinal diffuse large B cell lymphoma’ (PMBL) and the best way to treat it.
Cancer Research UK supported this study.
More about this trial
Diffuse large B cell lymphoma (DLBCL) is a type of high grade non Hodgkin lymphoma. ’Mediastinal’ means it started in the glands (lymph nodes) in the centre of the chest (the ‘mediastinum’). Primary mediastinal diffuse large B cell lymphoma (PMBL) is a rare type of Non Hodgkin lymphoma.
In this study researchers looked a samples of lymphoma tissue. They also looked at PET-CT scans taken before and after chemotherapy. The aims of this study were to:
- understand more about PMBL and the best way to treat it
- see if PET-CT scans would be useful in showing how well the treatment had worked
Summary of results
The study team found that PET-CT scans could possibly be used to show how successful treatment for PMBL might be.
This was a phase 2/3 study. 125 people took part.
A 103 people had a scan before starting chemotherapy. Everyone had a PET-CT scan after finishing chemotherapy.
PET-CT scans show the activity of cancer cells. The researchers looked at 3 different activities to see if they could show how well the chemotherapy worked.
Total lesion glycolysis (TLG) was one of these activities. It shows how much sugar cancer cells uses in relation to its size.
After 5 years follow up, the team looked at the percentage of people who were still alive and the percentage of people who were alive with no sign of their cancer. They also looked the level of TLG in the 1st PET-CT scan of these people.
For those whose scan showed a low level of TLG they found:
- they were all alive (100%)
- 99 out of every 100 people (99%) had no sign of their cancer
For those whose scan showed a high level of TLG they found:
- 80 out of every 100 people (80%) were still alive
- 64 out of every 100 people (64%) had no sign of their cancer
The study team said that the TLG on the 1st PET-CT scan appeared to be a good predictor of how well treatment might work. They recommend further studies to confirm this.
We have based this summary on information from the research team. The information they sent us has been reviewed by independent specialists (
How to join a clinical trial
Professor Peter Johnson
Cancer Research UK
Experimental Cancer Medicine Centre (ECMC)
NIHR Clinical Research Network: Cancer
University Hospital Southampton NHS Foundation Trust
International Extra nodal Lymphoma Study Group (IELSG)
University of Southampton Clinical Trials Unit
This is Cancer Research UK trial number CRUKE/06/035.