Menarini Group Presents Updated Data from ELECTRA and ELEVATE Combination Studies of Elacestrant (ORSERDU) in Patients with ER+, HER2- Metastatic Breast Cancer (mBC) at the ASCO 2024 Annual Meeting

The Menarini Group (“Menarini”), a leading international pharmaceutical and diagnostics company, and Stemline Therapeutics, Inc. (“Stemline”), a wholly-owned subsidiary of the Menarini Group, focused on bringing transformational oncology treatments to cancer patients, will present updated results from phase 1b/2 ELECTRA and ELEVATE clinical studies evaluating elacestrant (ORSERDU) in combination with other treatments. Both the ELECTRA and ELEVATE studies were designed to overcome different resistance mechanisms observed in estrogen receptor-positive (ER+), HER2-negative (HER2-) metastatic breast cancer (mBC) and improve patient outcomes through novel oral-oral combination treatment options. Data will be presented at the 2024 American Society of Clinical Oncology (ASCO), on June 2 from 9 a.m. to 12 p.m. CT.

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The ELECTRA study is evaluating elacestrant in combination with abemaciclib in patients with ER+, HER2- metastatic breast cancer with brain metastases; however, the phase 1b portion of this study was conducted in all metastatic sites, including brain metastases. The updated phase 1b results continue to show a satisfactory safety profile, consistent with prior findings, and promising activity in patients with ER+, HER2- advanced or mBC regardless of metastatic site. Based on the results of this portion of the study, the recommended phase 2 dose (RP2D) will be reported as part of the data presentation. Currently, the phase 2 portion of ELECTRA is ongoing at the RP2D to further characterize the efficacy and safety in patients with ER+, HER2- metastatic breast cancer with brain metastases, since both elacestrant and abemaciclib cross the blood-brain barrier.

“It is encouraging to see that, even in the early stages of the trial, the combination of elacestrant plus abemaciclib indicates a tolerable and manageable safety profile for the patients in the clinical trial,” said Erika Hamilton, MD, Director of Breast Cancer Research and Executive Chair of the Breast Cancer Research Executive Committee for Sarah Cannon Research Institute. “The study continues to demonstrate elacestrant’s potential in combination with other therapies and we look forward to analyzing more data from this combination for this patient population in need of new options.”