Researchers have spotted ‘gamma delta T cells’ in human breast tissue. They believe the cell is released by the immune system to fight tumours, may play an important role in wiping out breast cancer.
Women are more likely to survive breast cancer if their immune system kills all the tumours cells so the cancer cannot come back.
A study, published in the Science Journal Translational Medicine, tracked 11 women from Guy’s and St Thomas’ Hospital Trust in London. It found five women recovered from breast cancer and were still in the clear four to five years later. In every case, these women had higher levels of gamma delta T cells in their tumours compared to their normal breast.
The other six patients saw their cancer come back within 18 months and kill them. All but one patient in this group had low levels of gamma delta T cells. The aggressive form of the cancer does not respond to hormone therapies, such as Tamoxifen
Experts at the Francis Crick Institute and King’s College London looked at 11 women with triple negative breast cancer, the deadliest type. Those with greater numbers of gamma delta T cells in their tumours were alive four years later. But five of those with a low number of the vital cells died, after their cancer returned.
The breakthrough opens the doors for future treatments which could see sufferers injected with extra gamma delta T cells taken from healthy donors. The cells are thought to be released by the immune system after changes in breast tissue. They have previously been spotted in the gut and skin, but this is the first time they have been identified in the breast.
Lead author Dr Fernanda Kyle-Cezar, at KCL, said: ’Proving that these special cells are present in human breast tissue is an exciting first. ‘We knew from animal model studies that gamma delta cells might play an important role in killing tumours. ‘But this is the first clear evidence that they may do so in human breast cancer.
The discovery opens the door to look at new ways we may be able to tackle this devastating disease.’ The scientists first spotted the gamma delta T cell after examining tissue from 90 patients and counting the cells using their DNA. They then tested how different levels of the specialist cell affected the survival chances of women with triple-negative breast cancer.
It means scientists seeking a way of helping patients have had to look for alternative immunotherapy treatments. Co-author Dr Yin Wu, a clinician at Guy’s and St Thomas’ Hospital and University College Hospital, said the findings may lead to new immunotherapy treatments. She said: ’It could mean that in the future we’re able to improve a patient’s chance of survival by either artificially activating more of these cells to fight the tumour cells or we could transfer cells from a donor.’ Experts believe gamma T cells are better at detecting cancer than the body’s more common white blood cells, T cells. .