A Study to Evluate Efficacy and Safety of HRS-8080 Combined With Dalpiciclib in Patients With Advanced or Metastatic Breast Cancer Resistant to Adjuvant Endocrine Therapy.

June 1, 2026 updated by: Shandong Suncadia Medicine Co., Ltd.

A Multicenter, Open-label, Randomized Controlled Phase III Clinical Study Evaluating the Efficacy and Safety of HRS-8080 Combined With Dalpiciclib Versus Fulvestrant Combined With Dalpiciclib in Patients With Locally Advanced or Metastatic Breast Cancer Resistant to Adjuvant Endocrine Therapy.

The study is being conducted to evaluate the efficacy and safety of HRS-8080 combined with dalpiciclib versus fulvestrant combined with dalpiciclib in patients with locally advanced/metastatic breast cancer who had developed drug resistance to prior adjuvant endocrine therapy.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
912

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • China
    • Beijing Municipality
      • Beijing, Beijing Municipality, China, 100000
        • Recruiting
        • Chinese PLA General Hospital Fifth Medical Center
        • Principal Investigator:
          • Zefei Jiang

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Women aged 18 - 75 years old;
  2. Eastern Cooperative Oncology Group performance status (ECOG-PS) of 0 to 1;
  3. Patients with histologically confirmed locally advanced or metastatic breast cancer;
  4. Patients with prior adjuvant endocrine resistance following curative-intent surgery;
  5. Menstrual status: postmenopausal, perimenopausal, or premenopausal;
  6. Presence of evaluable lesions;
  7. Organ function must meet required criteria.

Exclusion Criteria:

  1. Patients with rapidly progressing disease, as judged by the investigator to be unsuitable for endocrine therapy;
  2. Patients who have previously received fulvestrant or other novel SERMs (excluding tamoxifen and toremifene);
  3. Patients with uncontrolled brain metastases, carcinomatous meningitis, or spinal cord compression;
  4. Patients with a history of clinically significant cardiovascular disease;
  5. Participants who have not recovered from adverse effects caused by prior therapies;
  6. Participants with a history of another malignancy within the past 5 years or currently having another malignancy;
  7. Known hypersensitivity to HRS-8080, fulvestrant, dalpiciclib, or any of their components, etc.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: HRS-8080 combined with Dalpiciclib
Drug: HRS-8080 Tablet ; Dalpiciclib Isethionate
  • HRS-8080 Tablet
  • Dalpiciclib Isethionate
Active Comparator: Fulvestrant combined with Dalpiciclib
Drug: Fulvestrant injection ;Dalpiciclib Isethionate
  • Fulvestrant injection
  • Dalpiciclib Isethionate

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Investigator assessed Progression free survival (PFS)
Time Frame: Up to 5 years.
PFS is defined as the time from randomization to the first occurrence of PD, as determined by the investigator according to Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST v1.1), or death from any cause during the study.
Up to 5 years.

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Duration of response (DOR)
Time Frame: Up to 5 years
Up to 5 years
Overall survival (OS)
Time Frame: Up to 8 years
Up to 8 years
Overall response rate (ORR)
Time Frame: Up to 5 years
Up to 5 years
Progression free survival (PFS) evaluated by the blinded independent central review (BICR)
Time Frame: Up to 5 years
Up to 5 years
Clinical benefit rate (CBR)
Time Frame: Up to 5 years
Up to 5 years
The incidence and severity of adverse events (AEs)
Time Frame: Up to 5 years
Up to 5 years
The incidence and severity of serious adverse events (SAEs)
Time Frame: Up to 5 years
Up to 5 years
Number of participants with vital sign abnormalities over the course of the study. Vital signs include respiratory rate, pulse rate, systolic and diastolic blood pressure, and temperature
Time Frame: Up to 5 years
Up to 5 years
Number of participants with clinical laboratory test abnormalities for haematology and biochemistry parameters over the course of the study
Time Frame: Up to 5 years
Up to 5 years
Heart rate (beats per minute) measured by 12-lead electrocardiography.
Time Frame: Up to 5 years
Up to 5 years
QT interval (ms) measured by 12-lead electrocardiography.
Time Frame: Up to 5 years

Eastern Cooperative Oncology Group (ECOG) performance status. ECOG performance status was measured on a 6 point grade scale.

0: Fully active, able to carry on all pre-disease performance without restriction.

  1. Restricted in physically strenuous activity but ambulatory and able to carry out work of a light or sedentary nature, e.g., light house work, office work.
  2. Ambulatory and capable of all self-care but unable to carry out any work activities. Up and about more than 50% of waking hours.
  3. Capable of only limited self-care, confined to bed or chair more than 50% of waking hours.
  4. Completely disabled. Cannot carry on any self-care. Totally confined to bed or chair.
  5. Dead.
Up to 5 years
Plasma concentrations of HRS-8080 and dalpiciclib isethionate
Time Frame: Up to approximately 2 years
Up to approximately 2 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Shandong Suncadia Medicine Co., Ltd.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
May 5, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 1, 2028

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 1, 2031

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
January 8, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 20, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
January 21, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
June 2, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
June 1, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
January 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • HRS-8080-301

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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