A Trial of HRS-6209-205 to Evaluate the Safety, Tolerability, Pharmacokinetics and Efficacy of HRS-6209 in Combination Therapy in Subjects With HR-Positive/HER2-Negative Cancer

August 10, 2026 updated by: Atridia Pty Ltd.

An Open-Label, Multi-Center Phase II Clinical Study Evaluating the Safety, Tolerability, Pharmacokinetics, and Preliminary Efficacy of HRS-6209 in Combination With Fulvestrant or Letrozole in Patients With Solid Tumor

To evaluate the Safety, Tolerability, Pharmacokinetics and Efficacy of HRS-6209 in Subjects with HR-Positive/HER2-Negative solid tumor.

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.
15

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 1

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 Contact Backup

Study Locations

  • Australia
    • New South Wales
      • Bowral, New South Wales, Australia, 2567
        • Recruiting
        • Southern Highlands Private Hospital
        • Contact:
          • Sarah Childs
      • Sydney, New South Wales, Australia, 2086
        • Recruiting
        • GenesisCare Frenchs Forest
        • Contact:
          • Connie Diakos, Dr
      • Sydney, New South Wales, Australia, 2068
        • Recruiting
        • GenesisCare St Leonards
        • Contact:
          • Connie Diakos
    • South Australia
      • Elizabeth Vale, South Australia, Australia
        • Recruiting
        • Lyell McEwin Hospital
        • Contact:
          • Mark McGregor
    • Victoria
      • Ballarat, Victoria, Australia
        • Recruiting
        • Ballarat Base Hospital
        • Contact:
          • James Ridgwell
      • Frankston, Victoria, Australia
        • Recruiting
        • Frankston Hospital
        • Contact:
          • Jacqui Thomson

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. Ability to understand the trial procedures and possible adverse events, voluntarily participate in the trial.
  2. Adequate bone marrow and other vital organ functions
  3. Adequate liver function tests
  4. HR-positive or HER2-negative solid tumor patients

Exclusion Criteria

  1. Plan to receive any other anti-tumor therapy during the study.
  2. Active brain metastases .
  3. Have poorly controlled or severe cardiovascular disease, including (1) congestive heart failure.
  4. Previous use of fulvestrant
  5. clinically significant endometrial abnormalities, including but not limited to endometrial hyperplasia and dysfunctional uterine bleeding.
  6. With uncontrollable chronic systemic complications (such as severe chronic lung, liver, kidney, or heart disease).
  7. With acute or active tuberculosis infection requiring medication.
  8. Pregnant or lactating women, or females planning to become pregnant During the study.
  9. Known history of clinically significant liver disease, untreated active hepatitis (hepatitis B, defined as hepatitis B virus surface antigen [HBsAg] or hepatitis B core antibody [HBcAb] positive

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: N/A
  • Interventional Model: Single Group 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-6209 Capsules and fulvestrant injection
Drug: HRS-6209 Capsules and fulvestrant injection
HRS-6209, 100mg BID for 4 weeks, and single dose of fulvestrant injection

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
Safety by reporting incidence and severity of Adverse events (graded as per CTCAE V5.0) of adverse events (AEs) and serious adverse events (SAEs),
Time Frame: Screening up to study completion,, an average of 1 year.
To safety and tolerability of HRS-6209 in combination with fulvestrant in patients with advanced unresectable or metastatic breast cancer
Screening up to study completion,, an average of 1 year.

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
Objective Response Rate (ORR)
Time Frame: Screening up to study completion, an average of 2 years.
ORR refers to the proportion of subjects with a complete response (CR) or partial response (PR) based on all soft tissue assessments recorded from the date of first drug administration to either the date of radiographic disease progression (including bone progression and soft tissue progression), death from any cause, or the initiation of a new antitumor therapy, whichever occurs first. For subjects with CR or PR at the first evaluation, the efficacy should be confirmed 4 weeks later or at the next tumor imaging evaluation. The numerator includes subjects with a confirmed CR/PR at least 4 weeks after the initial assessment. The denominator consists of subjects with measurable target lesions at baseline.
Screening up to study completion, an average of 2 years.
Best of Response (DoR)
Time Frame: Screening up to study completion, an average of 2 years.
BOR refers to the best response of tumor evaluation, including CR, PR, stable disease (SD), progressive disease (PD), and not evaluable for response (NE).
Screening up to study completion, an average of 2 years.
Disease Control Rate (DCR)
Time Frame: Screening up to study completion, an average of 2 years.
DCR refers to the time from the first occurrence of CR or PR to PD or death from any cause, whichever occurs first, in subjects with objective response. DCR will be recorded from baseline visit until the end of the study.
Screening up to study completion, an average of 2 years.
rPFS (radiographic progression-free survival
Time Frame: Screening up to study completion, an average of 2 years.
rPFS refers to the time from the first dose of investigational drug to the first radiographic PD or death from any cause (whichever occurs first) as assessed by the investigator. rPFS will be recorded from baseline visit until the end of the study.
Screening up to study completion, an average of 2 years.
Concentration
Time Frame: From administration to Cycle2 , up to 4 months.
Plasma concentrations of HRS-6209 during multiple dosing, directly observed from data.
From administration to Cycle2 , up to 4 months.
Cmax,ss
Time Frame: From administration to Cycle2, up to 4 months.
Css, max are steady-state maximum concentrations of HRS-6209 during multiple dosing, and are directly observed from data.
From administration to Cycle2, up to 4 months.
Cmin,ss
Time Frame: From administration to Cycle2, up to 4 months.
Css, min are the steady-state trough concentrations of HRS-6209 during multiple dosing, and are directly observed from data.
From administration to Cycle2, up to 4 months.

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.
Atridia Pty 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 15, 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.
April 10, 2027

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.
November 10, 2027

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).
December 28, 2025

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 13, 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 22, 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.
August 11, 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.
August 10, 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-6209-205

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

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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