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Clinical Trial ● Currently Recruiting Phase III NCT05696626

Evaluation of Lasofoxifene Combined With Abemaciclib Compared With Fulvestrant Combined With Abemaciclib in Locally Advanced or Metastatic ER+/HER2- Breast Cancer With an ESR1 Mutation

Evaluation of Lasofoxifene Combined With Abemaciclib Compared With Fulvestrant Combined With Abemaciclib in Locally Advanced or Metastatic ER+/HER2- Breast Cancer With an ESR1 Mutation — Recruiting • Phase…

📅 07 Apr 2026 ⏱ 2 min read
Currently Recruiting
This trial is actively seeking participants in the UK. Discuss eligibility with your patient before referring.
Status
Currently Recruiting
Phase
Phase III
NCT ID
NCT05696626
Sponsor
LeonaBio
Start
2023-10-31
ClinicaliQ Trial Snapshot
  • Evaluation of Lasofoxifene Combined With Abemaciclib Compared With Fulvestrant Combined With Abemaciclib in Locally Advanced or Metastatic ER+/HER2- Breast Cancer With an ESR1 Mutation — Recruiting • Phase III • Oncology • NCT05696626.
  • The goal of this clinical trial is to assess the efficacy, safety and tolerability of the combination of lasofoxifene and abemaciclib compared to fulvestrant and abemaciclib for the treatment of pre- and postmenopausal women and men who have previously received ribociclib or….
  • Sponsor: LeonaBio.

Verify eligibility, endpoints and current status on the original source registry before acting on this summary.

Use This Page For
  • Quick orientation before opening the registry record.
  • Checking recruitment status, phase and sponsor at a glance.
  • Connecting this trial to nearby guidelines, Drug Science and education.
What This Trial Is Studying

The goal of this clinical trial is to assess the efficacy, safety and tolerability of the combination of lasofoxifene and abemaciclib compared to fulvestrant and abemaciclib for the treatment of pre- and postmenopausal women and men who have previously received ribociclib or palbociclib-based treatment and have locally advanced or metastatic estrogen receptor positive (ER+)/human epidermal growth factor 2 negative (HER2-) breast cancer with an estrogen receptor 1 (ESR1) mutation. The main question the study aims to answer is: • To compare the efficacy of the combination of lasofoxifene and abemaciclib…

Eligibility Snapshot
  • : 1. Pre- or postmenopausal women or men. 2. Locally advanced and/or metastatic ER+ breast cancer with radiological or clinical evidence of progression on an AI in combination with either palbociclib or ribociclib as their first hormonal treatment for metastatic disease. 3. Histological or cytological confirmation of ER+/HER2 - disease 4. No evidence of progression for at least 6 months on an AI/CDKi combination for advanced breast cancer. 5. At least 1 or more ESR1 point mutations in the ESR1 ligand binding domain as assessed in cell- free ctDNA obtained from a blood or breast cancer tissue. 6. Locally advanced or metastatic breast cancer with either measurable (according to RECIST 1.1) or non-measurable lesions. 7. Subjects may have received 1 cytotoxic chemotherapy regimen in the metastatic disease setting prior to study entry, but must have recovered from chemotherapy acute toxicity excluding alopecia and Grade 2 peripheral neuropathy. 8. Eastern Cooperative Oncology Group (ECOG) performance score of 0 or 1 9. Adequate organ function 10. Able to swallow tablets 11. Brain metastases are allowed only if the following 4 parameters hold: 1. Asymptomatic, 2. Definitively treated (e.g., radiotherapy, surgery), 3. Not requiring steroids up to 4 weeks before study treatment…

Use the source registry for the full inclusion and exclusion criteria before discussing referral or enrolment.

Full Trial Details
View this trial on the source registry
Eligibility criteria, protocol, and results when available
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