What the trial was testing
The monarchE Trial enrolled 5,637 patients with breast cancer. The study was sponsored by Eli Lilly and tracked outcomes across the full group of patients who matched the trial's eligibility profile.
It was a large trial designed to confirm whether the treatment works well enough for wider use. Trials at this stage are designed to produce evidence regulators and physicians can act on — not just observations to follow up later.
What the results showed
35% reduction in the risk of cancer returning in high-risk HR+ breast cancer patients after surgery.
Journal of Clinical Oncology · 2026 · NCT02326324
These findings — that in risk of cancer returning for high-risk HR+ breast cancer patients after surgery — were published in the Journal of Clinical Oncology and represent the headline result of the study.
Researchers tracked outcomes across 5,637 patients enrolled in the trial. The result was consistent enough across the group that the team felt confident reporting it.
What this means for patients
For patients with breast cancer, this result changes the calculus on what to ask their care team about. Whether it changes day-to-day care depends on factors like disease subtype, prior treatments, and where the patient is in their care journey.
What you can do now
Abemaciclib (Verzenio) is FDA-approved and available now. Eligibility depends on tumor size, grade, and lymph node involvement. Ask your oncologist whether you qualify based on your pathology report.
Eligibility for the treatments mentioned above depends on specific test results and clinical history. Bring this summary, the trial name, and your most recent labs or pathology report to your next visit.
Open breast cancer trials
Anlotinib With Trastuzumab Deruxtecan for Previously Treated HER2-Low Advanced Breast Cancer
This study will evaluate the safety, tolerability and efficacy of anlotinib and trastuzumab deruxtecan in human epidermal growth factor receptor 2 (HER2)-low unresectable and/or metastatic breast cancer who had received ≤1 line of prior chemotherapy.
Effect of Mandala Coloring on Anxiety, Distress, and Comfort in Breast Cancer Patients Receiving Outpatient Chemotherapy
Breast cancer patients receiving chemotherapy often experience psychological distress, anxiety, and discomfort during treatment. Non-drug supportive methods may help improve patients' well-being during chemotherapy. This study aims to evaluate whether mandala coloring during outpatient chemotherapy can reduce psychological distress and anxiety and improve comfort in breast cancer patients. Participants will be randomly assigned to either a mandala coloring group or a routine care group. Patients in the intervention group will color mandala patterns for 30 minutes during their chemotherapy session, while the control group will receive routine care only. Psychological distress, anxiety, and comfort levels will be measured before and after the chemotherapy session in both groups. The results of this study may provide evidence for a simple and low-cost supportive intervention to improve the psychological well-being of breast cancer patients during chemotherapy.