On December 12, 2023 Sermonix Pharmaceuticals Inc., a privately held biopharmaceutical company developing innovative therapeutics to specifically treat metastatic breast cancers (mBC) harboring ESR1 mutations, reported the three poster presentations examining clinical data tied to Sermonix’s Evaluation of Lasofoxifene in ESR1 Mutations (ELAINE) studies (Press release, Sermonix Pharmaceuticals, DEC 12, 2023, View Source [SID1234638576]). The presentations were initially shared last week at the 2023 San Antonio Breast Cancer Symposium (SABCS).
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"Secondary analysis of our ELAINE study results reveals reassuring pharmacokinetic data, further confidence in lasofoxifene’s ability to be effectively combined with abemaciclib, and a better understanding of the baseline genomic alterations found in patients with ESR1 mutations," said Dr. Paul Plourde, Sermonix vice president for clinical oncology development. "We are delighted to be actively screening and enrolling patients into our Phase 3 ELAINE-3 registrational trial at institutions across the U.S., and with the EU to closely follow."
One poster addressed pharmacokinetics (PK) of lasofoxifene as a monotherapy and in combination with Eli Lilly and Company’s CDK4/6 inhibitor abemaciclib (Verzenio). Key takeaways included:
PK data for lasofoxifene 5 mg/day were consistent with previous clinical trials, resulting in similar steady-state concentrations in patients across several studies.
Addition of abemaciclib to lasofoxifene did not appear to alter the PK of lasofoxifene in ELAINE-2 compared with monotherapy in ELAINE-1, suggesting little to no drug-drug interaction.
Abemaciclib concentrations in ELAINE-2 were consistent with previous monotherapy data, suggesting no impact of lasofoxifene on abemaciclib PK.
A second poster discussed baseline genomic alterations and the activity of lasofoxifene and abemaciclib during the ELAINE-2 study. Key results/conclusions included:
In 26 of the 29 patients (median age 60 years) enrolled, ESR1 mutations were identified at baseline by the Guardant360 CDx test. The profiling demonstrated that other genomic alterations are frequently detected concurrently with ESR1 mutations in the endocrine-resistant setting, in line with previous findings among patients with hormone receptor-positive mBC.
Co-alterations in ESR1 and other genes associated with treatment resistance did not appear to compromise the efficacy of lasofoxifene plus abemaciclib in ELAINE-2.
A third poster offered a trial-in-progress update on ELAINE-3, a 400-patient Phase 3 study assessing the efficacy and safety of lasofoxifene in combination with abemaciclib in treating locally advanced or ER+/HER2- mBC with an ESR1 mutation. ELAINE-3 enrollment is now underway.
To learn more about Sermonix Pharmaceuticals and lasofoxifene, visit View Source For more information about the ELAINE studies, visit View Source
About Lasofoxifene
Lasofoxifene is an investigational novel endocrine therapy in clinical development which has demonstrated robust target engagement as an ESR1 antagonist in the breast, particularly in the presence of ESR1 mutations. Lasofoxifene has demonstrated anti-tumor activity as monotherapy and in combination with a CDK4/6 inhibitor in Phase 2 studies and has unique tissue selectivity distinguishing it from other current and investigational endocrine therapies, with beneficial effects seen on vagina and bone in previous clinical studies. Lasofoxifene, which Sermonix licensed globally from Ligand Pharmaceuticals Inc. (NASDAQ:LGND), has been studied in previous comprehensive Phase 1-3 non-oncology clinical trials in more than 15,000 postmenopausal women worldwide. Lasofoxifene’s bioavailability and activity in mutations of the estrogen receptor could potentially hold promise for patients who have acquired endocrine resistance due to ESR1 mutations, a common finding in the metastatic setting and an area of high unmet medical need. Lasofoxifene’s novel activity in ESR1 mutations was discovered at Duke University and Sermonix has exclusive rights to develop and commercialize the product in this area. Lasofoxifene, a novel targeted and tissue selective oral endocrine therapy could, if approved, play a critical role in the precision medicine treatment of advanced ER+ breast cancer.