Long term survivors of cancer study funded by Continuum Life Sciences
Do you hold the key to unlocking the reasons behind your therapeutic success and the development of this for future patients?
A great deal of progress has been made in our understanding of the basic biology of common cancers. This has led to rapid development of new targeted drugs and immune therapies, which have been hugely beneficial for many patients.
Some cancers are amenable to long term treatment with single or sequential drug therapies. However, in these patients there is often a persistent small amount of cancer in the body as shown by CT or MRI scans. In other words modern cancer treatments reduce the volume of cancer and hold the remainder ‘in check’, and this results in excellent cancer control and quality of life, but the cancer usually progresses eventually.
A rare set of patients respond completely to their cancer treatment, and are able to live tumour free for greater than 5 years. This study aims to examine these long term survivors of cancer who are completely disease free. The biological basis of this excellent outcome is not understood, and although immune mechanisms are suggested there is no definitive evidence to date to show how this may actually occur. If we can understand the underlying mechanisms behind these rare durable disease-free outcomes in these fortunate individuals, we may be able to design new treatments for patients who are not responding.
This study is funded by Continuum Life Sciences.
Scientific background of the study
Recent advances have allowed detailed evaluation of a patient's general immune function. Scientists believe that certain patients have proteins on their tumour surface which show strong similarity to viral or bacterial proteins, and this has a positive impact on their long term outcome and survival. In other words, in these patients, the cancer was possibly being regarded as an infection by the immune system and, as such, rapidly and efficiently ‘rejected’. We aim to look for this form of recognition and tumour rejection in the stored tumour tissue of long term cancer survivors, taken prior to treatment, and who went on to have complete elimination of their cancer, despite having a high disease burden initially. Further understanding and corroboration of this process would quickly influence new immune-based treatments for other patients.
Recent technological advances have allowed detailed evaluation of the tumour microenvironment (TME), outlined key mechanisms of immune suppression and allowed design of new immunotherapy strategies. One key element in the TME is the tumour itself where mutations lead to generation and expression of new proteins on the tumour surface, so called neoantigens. These neoantigens are recognised by infiltrating T cells which are either allowed to fulfil their toxic function and kill tumour cells, or are subdued by other immune cells by the expression of immune-inhibitory mechanisms. Recent studies have indicated that tumours with the highest neoantigen number combined (and not independently) with the densest cytotoxic T cell infiltrate inside the tumour predicted long term survival in pancreatic cancer (PDAC). Furthermore it has also been shown that patients whose neoantigens show strong similarity to viral or bacterial proteins, so called molecular mimicry, had a positive impact on their long term outcome and survival. Corroboration of this form of molecular mimicry in the archival tumour tissue of long term survivors across a number of aggressive cancers is one way in which analysis of the TME of such patients could lead to new interventional approaches using microbial proteins to induce such immunity before/after surgery with high potential impact on patient survival.
In addition, there is emerging evidence that certain microbes (bacteria) in our gut may have a significant effect on the function and efficiency of our immune system and may contribute to the long term disease free outcomes in cancer patients. The microbial make-up in the bowel is called the ‘microbiome’ and comprises a large array of bacterial species, the interplay between which may directly influence the way the immune system responds to evolving cancers and may help tumour rejection/destruction.
We will compare long term survivors with control participants who will be healthy volunteers and also current cancer patients who we hypothesise won’t have proteins which mimic bacterial/viral proteins on the surface of their tumours (healthy volunteers will only have their blood and stool analysed) and will have different gut flora to long term survivors.
Therefore a full evaluation of immune function in these long term survivor patients and control participants will include blood-resident immune cells, HLA tissue typing (Identifying which type of HLA proteins are present on their tissue – these proteins are responsible for regulating the immune system), an examination of their complete medical history and concurrent diseases, examination of their original cancer tissue (which will be stored in an archive in paraffin wax) and an insight into the bacterial populations in the gut which can be determined using stool samples.
What will happen if I take part?
- You contact the hotline and your details will be logged into the Continuum long term survivors of cancer database.
- A research scientist will:
- Contact you and check you are eligible for the study
- Take your consent
- Send you a stool sample kit to be done at home.
- You will visit one of the Continuum partner research sites to:
- Donate a blood sample
- Carry out a lifestyle questionnaire
- Return your stool sample
- Allow us access to archived tumour tissue.
- Your samples will be analysed by scientists from the Continuum partnership to try to identify why you are a long term survivor of cancer.
Would you like to get involved?
We are searching for long term survivors of cancer. In order to be eligible for the study you must answer ‘yes’ to all of the following Inclusion criteria:
- Are you a long term survivor (> 5 years all clear) of an aggressive, locally advanced and/or metastatic cancer (cancer that has spread beyond the organ of origin which was treated with surgery, immuno, chemo or radiotherapy which completely disappeared or never returned)
- Will you allow access to and use of medical history and personal data?
- Are you willing to complete a lifestyle questionnaire?
- Are you willing/able to travel to Guildford (you will receive travel expenses) to donate blood (50mls)?
- Are you willing/able to donate a stool/poo sample (you will be given a kit to do at home and asked to return it in the post)?
- Will you allow access to your stored tumour tissue?
- You have had no cancer treatment for greater than 5 years?
- You have had no visible cancer on any of your scans for greater than 5 years?
If you or anyone you know fit all of the inclusion criteria for the study and are interested in taking part, please contact us:
- Email: firstname.lastname@example.org
- Phone: 0800 1 44 84 88.