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‘Holy grail' of breast cancer prevention in high-risk women may be in sight
21 June 2016
Professor Jane Visvader have discovered a potential new way
to prevent breast cancer in some at-risk women.
Australian researchers have discovered that an existing medication could have promise in preventing breast cancer in women carrying a faulty BRCA1 gene.
People who carry a faulty BRCA1 gene are at high risk of developing aggressive breast cancer. Currently many women with a gene mutation choose surgical removal of their breast tissue and ovaries to reduce their chance of developing breast and ovarian cancer.
By pinpointing the cells that give rise to breast cancers in women who have inherited a faulty version of the BRCA1 gene, Walter and Eliza Hall Institute researchers have identified that the drug denosumab may have potential to prevent breast cancer from developing. If confirmed in clinical studies, this would provide a non-surgical option to prevent breast cancer in women with elevated genetic risk.
Using samples of breast tissue donated by women carrying a faulty BRCA1 gene, Ms Emma Nolan, Professor Jane Visvader and Professor Geoff Lindeman were able to pinpoint the cells that give rise to breast cancer. The research, which also involved researchers at the Australian familial cancer consortium kConFab and Dr Bill Dougall from the US biotechnology company Amgen was published today in Nature Medicine.
Cancer precursor cells in BRCA1-mutant breast tissue had many similarities to aggressive forms of breast cancer, said Ms Nolan, who is a PhD student at the institute enrolled through The University of Melbourne’s Department of Medical Biology. “These cells proliferated rapidly, and were susceptible to damage to their DNA – both factors that help them transition towards cancer,” she said. “We were excited to discover that these pre-cancerous cells could be identified by a marker protein called RANK.”
Utilising an existing treatment
Professor Lindeman, who is also a medical oncologist at The Royal Melbourne Hospital, said the discovery of RANK as a marker of cancer precursors was an important breakthrough, because inhibitors of the RANK signalling pathway were already in clinical use. “An inhibitor called denosumab is already used in the clinic to treat osteoporosis and breast cancer that has spread to the bone,” he said. “We therefore investigated what effect RANK inhibition had on the cancer precursor cells in BRCA1-mutant breast tissue.”
The research team showed that RANK inhibition switched off cell growth in breast tissue from women with a faulty BRCA1 gene and curtailed breast cancer development in laboratory models.
“We think this strategy could delay or prevent breast cancer in women with an inherited BRCA1 gene mutation,” Professor Lindeman said. “A clinical trial has already begun to investigate this further.”
Professor Lindeman said that a concurrent study led by an Austrian group had also identified the importance of RANK. “Complementary approaches were used," he said. "They deleted the RANK gene during development. We switched off the RANK pathway using an inhibitor to recapitulate a breast cancer prevention study in humans. Both studies suggest that targeting RANK offers hope to women at high genetic risk for breast cancer.
“This is potentially a very important discovery for women who carry a faulty BRCA1 gene, who have few other options. Current cancer prevention strategies for these women include surgical removal of the breasts and/or ovaries, which can have serious impacts on people’s lives. To progress this work, denosumab would need to be formally tested in clinical trials in this setting as it is not approved for breast cancer prevention,” Professor Lindeman said.
A decade in the making
Professor Visvader said the discovery had its basis in more than a decade of investigations of breast stem cell function. “By thoroughly dissecting how normal breast tissue develops, we have been able to pinpoint the precise cells that are the culprits in cancer formation,” she said. “It is very exciting to think that we may be on the path to the ‘holy grail’ of cancer research, devising a way to prevent this type of breast cancer in women at high genetic risk.”
The research team worked closely with Mrs Avis Macphee, a patient advocate, through the Walter and Eliza Hall Institute’s consumer-researcher buddy system. The research was supported by The National Breast Cancer Foundation, The Qualtrough Cancer Research Fund, The Joan Marshall Breast Cancer Research Fund, the Australian Cancer Research Foundation, Cancer Council Victoria, the Cancer Therapeutics Cooperative Research Centre, an Amgen Preclinical Research Program Grant, the National Health and Medical Research Council, the Victorian Cancer Agency, and the Victorian Government Operational Infrastructure Support Scheme.
The Walter and Eliza Hall Institute is the research powerhouse of the Victorian Comprehensive Cancer Centre, an alliance of leading Victorian hospitals and research centres committed to controlling cancer.
For further information
Vanessa Solomon
Communications Adviser
Ph: +61 3 9345 2971
Mob: +61 431 766 715
Email: solomon@wehi.edu.au
Super Content:
In 2006 our breast cancer research team had a eureka moment: the discovery of breast stem cells.
Explore the story on our Discovery Timeline.
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Professor Geoff Lindeman answers frequently asked questions about the BRCA1 gene
This animation from WEHI.TV visualises research published in Nature Medicine in 2009 by Professor Jane Visvader and Professor Geoff Lindeman.
Video 1:06