Arthritis drugs could be repurposed to help prevent breast cancer spreading to the bone, study suggests – The University of Manchester
By daniellenierenberg
Drugs commonly used to treat arthritis may help to prevent breast cancer spreading to the bone, where it is incurable, new research suggests.
In a major new study published in Nature Communications, scientists propose that NHS arthritis drugs anakinra, canakinumab and sulfasalazine could in future be repurposed to help treat breast cancer, following the discovery of the role of bone marrow in the spread of the disease to the bone.
The study, largely funded by Breast Cancer Now, found that bone marrow releases a protein called interleukin 1-beta (IL-1) which encourages breast cancer cells to form secondary tumours once they reach the bone.
Crucially, the scientists at The University of Manchester and The University of Sheffield established that the process started by this molecule can be blocked by drugs already used in treating arthritis, with anakinra found to be able to prevent breast cancer forming secondary tumours in the bone in a study in mice.
While further research is needed to understand how these drugs may interact with the immune system or work together with other cancer therapies, it is hoped the findings could be quickly advanced into trials in women with breast cancer to try to prevent the disease spreading to the bone.
Research and care charity Breast Cancer Now said the findings offered another promising step in repurposing existing drugs to try to prevent the spread of breast cancer, following the recent addition of osteoporosis drugs bisphosphonates to NHS breast cancer treatment for certain patients.
Breast cancer is the UKs most common cancer, with around 55,000 women and 370 men being diagnosed each year and around 11,500 women still losing their lives each year in the UK.
Almost all of these deaths are attributable to secondary breast cancer, where breast cancer has spread to form tumours in other parts of the body. While secondary breast cancer (also known as metastatic breast cancer) can be controlled for some time, it currently cannot be cured.
One of the most common parts of the body for breast cancer to spread to is the bone, which can cause debilitating symptoms such as joint pain or fractures that often require surgery.
Special types of cells, called breast cancer stem cells, are thought to be responsible for the disease spreading around the body with previous research suggesting that healthy cells in different parts of the body can release certain molecules that help cancer stem cells settle and grow in new locations.
In a new study, research teams led by Dr Rachel Eyre and Professor Rob Clarke at The University of Manchester and Dr Penelope Ottewell from the Department of Oncology and Metabolism at The University of Sheffield investigated the growth of breast cancer cells in the lab and in mice to establish what helps the disease settle and grow in this location. They discovered the importance of certain factors released by the bone, and these findings were supported using data from patients with secondary breast cancer1.
The researchers first grew human breast cancer cells using liquid that human bone marrow had previously been grown in. They found that these cancer cells grew into tumours more easily than breast cancer cells that werent exposed to bone marrow liquid, suggesting bone marrow releases a molecule that helps cancer growth.
By tracking which signalling pathways2 became active in breast cancer cells after they had been exposed to bone marrow, the researchers discovered that the molecule IL-1 (which is released by bone marrow) was responsible for helping breast cancer stem cells grow into tumours.
They found that IL-1 activates a signalling pathway called NFKB/CREB-Wnt, which promotes the formation of secondary tumours a discovery that identifies multiple new targets (IL-1 receptor, NFKB, Wnt) for drugs to try to prevent the growth of breast cancer tumours in the bone.
Drugs that can inhibit the action of IL-1 already exist and are used in treating other conditions on the NHS. The researchers tested whether blocking the effect of IL-1 with clinically available arthritis drugs such as anakinra, as well as another drug, currently in trials for treating cancer, called vantictumab, could prevent the formation and growth of secondary breast cancer in the bone in mice.
They found that blocking the role of IL-1 using these drugs significantly reduced the ability of breast cancer cells to form secondary tumours in the bone in mice. For example, following treatment with anakinra, only 14% of mice developed secondary tumours in the bone, compared to 42% of controls.
Research is ongoing to understand how blocking the action of IL-1 to stop breast cancer spreading may affect the immune system, and whether drugs such as anakinra, canakinumab and sulfalazine could work with existing therapies including bisphosphonates to prevent the spread of the disease to the bone. With these drugs being well-tolerated and already in use in treating arthritis, the authors hope the findings could be quickly progressed into clinical trials for breast cancer in the future.
The researchers are also now working to understand whether the same signalling pathway (NFKB/CREB-Wnt) may be important in the spread of breast cancer to other parts of the body such as the liver or lungs.
The study was largely funded by Breast Cancer Now, with additional support from Weston Park Cancer Charity and the Medical Research Council.
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Arthritis drugs could be repurposed to help prevent breast cancer spreading to the bone, study suggests - The University of Manchester
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