NCT06570031CompletedPhase 1
ONO-4578-06:Phase I Study of ONO-4578 and Letrozole Plus CDK4 /6 Inhibitors in Breast Cancer
ONO-4578-06: Phase I , Open-label, Non-blind, First-line Endocrine Therapy With ONO-4578 and Standard Treatment Letrozole and CDK4/6 Inhibitors (Palbociclib or Abemaciclib) in Patients With Metastatic or Recurrent Postmenopausal Hormone Receptor-positive HER2-negative Breast Cancer
Source: ClinicalTrials.gov · Last updated 5 Jun 2026
Brief summary (registry, in English)
This is a multicenter, open-label, non-controlled, phase I study to investigate the tolerability and safety of ONO-4578 used in combination with standard-of-care letrozole and a CDK4/6 inhibitor (palbociclib or Abemaciclib) as first-line endocrine therapy in postmenopausal patients with metastatic or recurrent hormone receptor-positive, HER2-negative breast cancer.
- Status (registry)
- Completed
- Phase (registry)
- Phase 1
- Study type
- Interventional
- Enrollment
- 46 (actual)
- First submitted
- 31 Jul 2024
- Start date
- 9 Nov 2021
- Primary completion date
- 30 Apr 2026
- Lead sponsor
- Ono Pharmaceutical Co., Ltd.
- Diseases
- Metastatic breast cancer
- NCT number
- NCT06570031
What you commit to
- Study type: Interventional · Phase 1
- Participants enrolled: 46
- From 9 Nov 2021 to the primary completion date, 30 Apr 2026
- 13 sites in 1 country
- Visits and tests: ask the trial team, the registry does not list them
Built from the registry fields of ClinicalTrials.gov. It describes the study, not your situation.
Who cannot take part
Copied verbatim from ClinicalTrials.gov and grouped by topic. Only the trial team decides who can take part.
Prior treatment
- Patients are unable to swallow oral medications
Other
- Patients with severe complication
Who the study is looking for
- Patients with postmenopausal metastatic or recurrent breast cancer
- Patients with ECOG Performance Status 0 to 1
- ER-positive, PgR-positive and HER2-negative patients
Age in the registry: 20 years to - · Sex: Female · Does not accept healthy volunteers
Sites (13)
Sites in registry order. Pick your city on the disease page to sort them by distance.
| Site | City | Country | Site status |
|---|---|---|---|
| Chiba Cancer Center Coordinator of this site? Confirm its status | Chiba | Japan | Unknown status |
| National Cancer Center Hospital Coordinator of this site? Confirm its status | Chuo Ku | Japan | Unknown status |
| National Cancer Center Hospital East Coordinator of this site? Confirm its status | Kashiwa-shi | Japan | Unknown status |
| St. Marianna University Hospital Coordinator of this site? Confirm its status | Kawasaki-shi | Japan | Unknown status |
| The Cancer Institute Hospital of JFCR Coordinator of this site? Confirm its status | Koto-ku | Japan | Unknown status |
| University Hospital Kyoto Prefectural University of Medicine Coordinator of this site? Confirm its status | Kyoto | Japan | Unknown status |
| Nagoya University Hospital Coordinator of this site? Confirm its status | Nagoya | Japan | Unknown status |
| Aichi Cancer Center Hospital Coordinator of this site? Confirm its status | Nagoya | Japan | Unknown status |
| Osaka International Cancer Institute Coordinator of this site? Confirm its status | Osaka | Japan | Unknown status |
| Tohoku University Hospital Coordinator of this site? Confirm its status | Sendai | Japan | Unknown status |
| Saitama Cancer Center Coordinator of this site? Confirm its status | Shinden | Japan | Unknown status |
| Tokyo Medical University Hospital Coordinator of this site? Confirm its status | Shinjuku-ku | Japan | Unknown status |
| Kanagawa Cancer Center Coordinator of this site? Confirm its status | Yokohama | Japan | Unknown status |
This page is information, not medical advice. Discuss any trial with your doctor.