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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.
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

Full criteria on ClinicalTrials.gov

Sites (13)

Sites in registry order. Pick your city on the disease page to sort them by distance.

SiteCityCountrySite status
Chiba Cancer Center
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ChibaJapanUnknown status
National Cancer Center Hospital
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Chuo KuJapanUnknown status
National Cancer Center Hospital East
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Kashiwa-shiJapanUnknown status
St. Marianna University Hospital
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Kawasaki-shiJapanUnknown status
The Cancer Institute Hospital of JFCR
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Koto-kuJapanUnknown status
University Hospital Kyoto Prefectural University of Medicine
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KyotoJapanUnknown status
Nagoya University Hospital
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NagoyaJapanUnknown status
Aichi Cancer Center Hospital
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NagoyaJapanUnknown status
Osaka International Cancer Institute
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OsakaJapanUnknown status
Tohoku University Hospital
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SendaiJapanUnknown status
Saitama Cancer Center
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ShindenJapanUnknown status
Tokyo Medical University Hospital
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Shinjuku-kuJapanUnknown status
Kanagawa Cancer Center
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YokohamaJapanUnknown status

This page is information, not medical advice. Discuss any trial with your doctor.