Photo New Scientist
A team of British and American scientists have discovered a way to slow the growth of breast cancer stem cells in the lab. The study led by Dr Bruno Simões and Professor Rob Clarke from The University of Manchester could eventually lead to combination drug therapies on previously untreatable breast cancers.
25% of all cancer diagnoses are for Breast Cancer and it is the fifth most common cause of death in women worldwide. Around three quarters of women who have breast cancer have what are known as oestrogen receptor positive tumours. Some breast cancer cells have receptors that bind to the hormone oestrogen and depend on it to grow. Though anti-oestrogen drugs such as tamoxifen and fulvestrant are able to prevent reoccurrence in most of these breast cancers, tumours reoccur in 1 out of 4 cases.
Many of the women relapse after several years, because some of the cancer stem cells remain after treatment lying dormant in the body and cannot be targeted by anti-oestrogen therapies.
Scientists have now found that cancer stem cells resistant to anti-oestrogen drugs express an immune system-related receptor called interleukin 1 receptor. The team found that a biological inhibitor of this receptor called Anakinra, used to treat rheumatoid arthritis, was able to reduce the ability of the cancer stem cells to form colonies. Additional research is being undertaken to confirm if drugs targeting interleukin 1 receptor can be used as an effective treatment.
Scientists from the Universities of Michigan, Liverpool and Edinburgh were closely involved in the work from the team in Manchester.
Dr Simões said: “Resistance to anti-oestrogen therapies in breast cancer patients is a major problem and one which cancer scientists have been trying to address for many years. Many drugs have been investigated by scientists as a possible combination therapy taken with anti-oestrogen therapies and we are still searching for a solution for these patients. However, most of these drugs target actively dividing cells whereas we are trying to also target cells that are in a dormant state. So we hope that these women who have increased numbers of cancer stem cells and do not respond to current treatment could one day benefit from combination therapy. There’s a very long way to go before we can say if this approach will help these women, but we are excited by our findings.”
Stem Cell Report
Possible Breakthrough in Breast Cancer Treatment relapse.
Quiescent cancer cells persist after chemotherapy in triple negative breast cancer
University of Manchester
Professor Robert Clarke, PhD. Division of Cancer Sciences
University of Manchester
Dr. Bruno Simoes, Research Fellow.