Mayo Clinic and Eli Lilly discover new standard of care for certain high-risk breast cancer patients

A groundbreaking partnership between Mayo Clinic and Eli Lilly has demonstrated that combining abemaciclib with endocrine therapy significantly enhances survival and reduces disease spread in early-stage high-risk breast cancer patients, based on the phase 3 monarchE trial.
Oct. 24, 2025

A partnership between Mayo Clinic and Eli Lilly is increasing survival for patients with early-stage breast cancer. Details of the collaboration are reported in a press release.

The study tested two years of FDA-approved abemaciclib (Verzenio) plus endocrine therapy in 2808 patients with HR+ and HER2- breast cancer. They “also had cancer in at least one underarm lymph node, a factor linked to higher risk of recurrence.” The other 2829 patients only received endocrine therapy. The participants were located in 38 different countries.

According to the phase 3 monarchE trial results, abemaciclib plus endocrine therapy could be the “new standard of care for this high-risk group.” The patients receiving the combination had a 15.8% lower risk of death compared to the other group. Additionally, “32% fewer experienced disease spread after seven years compared with those who only received endocrine therapy.” The researchers said they will continue to follow-up with the participants to “determine whether the survival benefit deepens over time.”

The study is published in Annals of Oncology.

About the Author

Erin Brady

Managing Editor

Erin Brady is Managing Editor of Medical Laboratory Observer.

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