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Study shows clinical benefit of new way of treating advanced ER+ breast cancer

2024-02-09
(Press-News.org) A research paper published today (8 February 2024) in The Lancet Oncology demonstrates that the drug enobosarm, a selective androgen receptor modulator which stimulates the male sex hormone receptor has anti-tumour effects in oestrogen receptor positive breast cancer patients.

Lead author Professor Carlo Palmieri from the University of Liverpool and The Clatterbridge Cancer Centre NHS Foundation Trust, said: “These results are very encouraging – we have shown that in advanced/metastatic breast cancer the use of enobosarm can result in clinical benefit, and is the first clinical proof that a non-oestrogen receptor approach with a selective androgen receptor modulator can result in clinical benefit. This builds on the pre-clinical evidence that we published in Nature Medicine.”

For at least 40 years, treatment of this type of breast cancer has focused on directly targeting and inhibiting the activity of the oestrogen receptor. This new study therefore tested a completely different approach.

The orally administered drug enobosarm is a selective androgen receptor modulator, which can stimulate androgen receptor activity in breast cancers. The androgen receptor is a tumour suppressor in oestrogen receptor positive breast cancer.

The multi-site international study led by Dr Beth Overmoyer of the Dana-Farber Cancer Institute of Boston USA evaluated the efficacy and safety of enobosarm in 136 postmenopausal women with locally advanced or metastatic ER-positive, HER2-negative breast cancer (HER2 is a protein called human epidermal growth factor receptor 2, which promotes the growth of cancer cells). Enobosarm was found to have anti-tumour effects, as well as being well tolerated with no significant impact on quality of life.

“These data support further development and assessment of the efficacy of enobosarm and other agents which stimulate the androgen receptor for the treatment of AR-positive, ER-positive, HER2-negative advanced breast cancer.”

The full study A Phase 2 open label randomized study of enobosarm, a novel oral, 1 selective androgen receptor modulator, in androgen receptor-positive, oestrogen receptor-positive, and HER2-negative advanced breast cancer is available in the Lancet Oncology.

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[Press-News.org] Study shows clinical benefit of new way of treating advanced ER+ breast cancer