New study: AMEERA-6

Partners collaborating on the AMEERA 6 trial
Sanofi partnering with leading academic cooperative groups to study amcenestrant in the adjuvant setting for patients with estrogen receptor positive breast cancer

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  • Sanofi partnering with the Breast International Group (BIG), the European Organization for Research and Treatment of Cancer (EORTC) and Alliance Foundation Trials (AFT), which are world-leading academic groups delivering practice-changing breast cancer clinical research
  • Collaborating on  the Phase 3 AMEERA-6 study expected to be the first pivotal trial of an oral selective estrogen receptor degrader (SERD) in the adjuvant setting and will evaluate the safety and efficacy of Sanofi’s investigational amcenestrant in estrogen receptor-positive (ER+) patients who prematurely discontinue standard therapy and have high risk of disease recurrence
  • Parties to finalize full terms of this cooperative effort
  • Additional treatment options in early breast cancer are needed to help prevent patients from developing advanced, incurable disease and would represent a significant treatment advance​

PARIS – June 4, 2021 – Sanofi partnering with leading groups delivering practice-changing breast cancer research, the Breast International Group (BIG), the European Organization for Research and Treatment of Cancer (EORTC) and the Alliance Foundation Trials (AFT), to initiate a pivotal trial of an oral selective estrogen receptor degrader (SERD) in the adjuvant setting. The Phase 3 AMEERA-6 study will evaluate the efficacy and safety of Sanofi’s amcenestrant vs tamoxifen for women with estrogen receptor-positive (ER+) breast cancer who were unable to continue their adjuvant aromatase inhibitor (AI) therapy.

“Together with our research partners, BIG conducts landmark, practice-changing trials that can have a significant impact on the lives of women with breast cancer. Adjuvant therapy helps prevent and delay the progression of disease into the later setting. However, current adjuvant therapies, like AIs, can have side effects for some women, which may cause them to discontinue the medication prematurely. Amcenestrant may be a potential option for women in this setting and we look forward to working with Sanofi, EORTC and AFT to investigate this further.”

David Cameron, Chair of the BIG Executive Board

“We look forward to collaborating with these leading academic networks to investigate amcenestrant in the adjuvant setting through AMEERA-6. Based on encouraging data emerging from our ongoing clinical program, we believe that amcenestrant, an investigational oral SERD, has the potential to become a best-in-class oral endocrine backbone therapy. Additional treatment options for patients with breast cancer are needed to allow women to remain on adjuvant therapy and decrease their risk of progressive disease.”

Peter Adamson, M.D., Global Development Head, Oncology at Sanofi

Amcenestrant is an oral SERD that antagonizes and degrades the estrogen receptor (ER), resulting in inhibition of the ER signaling pathway. Amcenestrant is currently under clinical investigation and its safety and efficacy have not been evaluated by any regulatory authority.

Despite the established clinical efficacy of tamoxifen and AIs in early breast cancer, many patients experience disease recurrence because of resistance to therapy, non-adherence or premature discontinuation of their adjuvant therapy.  Additional treatment options in the adjuvant setting in early breast cancer are needed to prevent women from developing advanced, incurable disease and could represent a significant treatment advance.

As per the terms of the Pre-Study Agreement, Sanofi will be the sponsor and will provide funding and investigational drug product for the global study. BIG will conduct the study within the BIG network, EORTC will oversee study management and data analysis, as well as the medical management, and AFT will conduct the United States portion of the study. Sanofi will conduct this global study in selected countries outside the geographical scope of the academic networks, as further described in a follow-on agreement under negotiation among the four parties. The protocol is being developed in collaboration with all four parties, including AFT, BIG, EORTC and Sanofi.

Read the press release

For information on this press release, please contact:

Oriana Spagnolo
Communications Manager
Tel: +32 479 814831

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