One Minute Insight
Theme lead for cancer, Professor Richard Gilbertson talks about what kind of work is happening in Cambridge to treat cancer.
The PAN cancer trial will ask people to breathe into a mask for 10 minutes. Researchers will then try and detect molecules called ‘volatile organic compounds’ (VOCs) to see if they can signal cancer.
The clinical trial will involve both healthy volunteers, to better understand ‘normal’ VOC levels, and patients with a suspected cancer diagnosis to look at whether the level of VOCs in their breath is different. The trial, which began in January 2019, is currently recruiting patients with oesophageal and stomach cancers but will expand to include patients with liver, prostate, kidney, bladder and pancreatic cancers.
Professor Rebecca Fitzgerald (right), Chief investigator of the trial, and co-lead for the Early Detection Programme, Cancer Research UK Cambridge Centre, said: “We urgently need to develop new tools, like this breath test, which could help to detect and diagnose cancer earlier, giving patients the best chance of surviving their disease. Through this clinical trial we hope to find signatures in breath needed to detect cancers earlier – it’s the crucial next step in developing this technology. Owlstone Medical’s Breath Biopsy® technology is the first to test across multiple cancer types, potentially paving the way for a universal breath test.”
If the trial is successful, researchers hope they can identify cancer sooner, reduce the need for invasive testing and roll this simple test out to GP’s surgeries.
The Cancer Research UK Cambridge Centre is running the PAN Cancer trial for Early Detection of Cancer in Breath in collaboration with Owlstone Medical to test their Breath Biopsy® technology.
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The 2.6m PERSEPHONE trial, the largest of its kind and led by Professor Helena Earl (right), Cambridge researchers found 89.4 per cent of women taking six months treatment were free of breast cancer after four years compared with 89.8 per cent of patients taking treatment for twelve months.
In addition, just three per cent of women in the six month study had to stop taking the drug – also called Herceptin – because of heart problems compared with eight per cent of those who took it for 12 months.
The cost saving of a six month, rather than 12 month, treatment is estimated at £9,699 per patient and potential global savings could be in the millions annually.
The study and data from a parallel French trial will be used to explore whether there are subgroups of higher risk women for whom 12 months therapy would remain the most appropriate course.
This new evidence could change practice and will be considered by NICE and NHS England. Women currently taking the medication should not change their treatment without seeking the advice of their doctor.
PREDICT Prostate has been developed by researchers at the University of Cambridge, led by Mr Vincent Gnanapragasam (pictured, right), University Lecturer and Honorary Consultant at Cambridge University Hospitals, and undertaken by Dr Thurtle, both of the Academic Urology Group in Cambridge, and in collaboration with Professor Paul Pharoah of the Department of Cancer Epidemiology.
The tool brings together the latest evidence and mathematical models to give a personalised prognosis, which aims to empower patients as they discuss treatment options with their consultant.
Mr Gnanapragasam said: “We believe this tool could significantly reduce the number of unnecessary – and potentially harmful – treatments that patients receive and save the NHS millions every year.”
Progression of prostate cancer is variable: in most cases, the disease progresses slowly and is not fatal. But in a significant number of men, the tumour will metastasise (spread to other organs in the body), threatening their health.
When a patient is diagnosed with prostate cancer, they are currently classified as low, intermediate or high risk, according to guidelines provided by NICE (the National Institute for Health and Care Excellence).
Depending on the patient’s risk group, clinicians will recommend either an ‘active monitoring’ approach or treatment. Treatment options include radiotherapy or surgery and can have potentially significant side-effects, including erectile dysfunction and urinary incontinence.
But the risk classifications have been shown to be only 60-70% accurate – meaning many men may elect for treatment when it is not necessary.
What PREDICT Prostate does is take routinely available information including PSA test results, the cancer grade and stage, the proportion of biopsies with cancerous cells, and details about the patient including his age and other illnesses.
It then gives a 10-15 year survival estimate. Importantly, the tool also estimates how the patient’s chance of survival differs depending on whether he opts for monitoring or treatment, providing context of the likelihood of success of treatment and risk of side effects.
- In a randomised study of almost 200 prostate cancer specialists, those clinicians given access to the PREDICT tool were less likely to recommend treatment in good-prognosis cancers
- The tool is recommended for use only in consultation with a clinician. It is not suitable for men with very aggressive disease or who have evidence of disease spread at the time of diagnosis
- Every year, tens of thousands of men are diagnosed with prostate cancer. But what should they do? Listen to Vincent Gnanapragasam’s interview with the Naked Scientists
Clinicians currently diagnose patients using a technique called trans-rectal ultrasound, which is where a small ultrasound probe inserted into the back passage. However, this method can be unpleasant, and have side effects such as urinary infections or risk of sepsis.
Cambridge researchers have devised a new tool, called the CamProbe, that allows biopsies to be taken via the transperineal route (under the scrotum) where a sample of tissue is removed from the prostate for examination under a microscope. This can be done under local anaesthesia.
No infections were detected using this technique in the pilot studies, compared with the 5-12% using the standard method, and most trial participants preferred the CamProbe test.
Now with further funding, clinical trials are underway to test the device on larger numbers of patients. If the results are positive, it will substantially improve the safety of routine testing for prostate cancer, reduce the risk of sepsis and antibiotic resistance and potentially save the NHS millions every year.
- See also the PREDICT Prostate tool which gives patients a personalised prognosis of their disease
Early detection of this type of cancer requires a referral for an endoscopy, where a camera is fed through your mouth to your stomach, which can be uncomfortable for some people and is expensive for the health service.
However, researchers in Cambridge have come up with a new way to collect cells from the oesophagus to test for cancer, which is easier and less uncomfortable than an endoscopy and importantly can be performed in the GP surgery. The device, known as the cytosponge or ‘pill on a string’, only takes a few minutes to use and can be done outside of a hospital setting.
Patients are asked to swallow a small capsule (about the size of a multivitamin pill) which is attached to a string. When it gets to the stomach the capsule disintegrates and releases a small sponge. The sponge is then pulled back using the string, collecting cells as it comes up the oesophagus which can be sent off for testing. The team have also devised the laboratory test to make the testing as fast and accurate as possible.
The cytosponge is now in its third stage of trials at GP practices and results are expected within a year. Early tests have shown them to be effective at detecting Barrett’s oesophagus. If trials continue to show positive results, the device could provide more patients to be tested for the possibility that they have Barrett’s oesophagus.
This means testing can take place in the community, identifying those who have suspected Barrett’s oesophagus faster and reducing the number of those who require an endoscopy. The cytosponge could revolutionise testing and save the NHS money.