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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

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

Status
Recruiting
Phases
Phase 1
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07358377
Enrollment
15
Registered
2026-01-22
Start date
2026-05-15
Completion date
2027-11-10
Last updated
2026-08-11

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Breast Cancer

Brief summary

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

Interventions

DRUGHRS-6209 Capsules and fulvestrant injection

HRS-6209, 100mg BID for 4 weeks, and single dose of fulvestrant injection

Sponsors

Atridia Pty Ltd.
Lead SponsorINDUSTRY

Study design

Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

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

Design outcomes

Primary

MeasureTime frameDescription
Safety by reporting incidence and severity of Adverse events (graded as per CTCAE V5.0) of adverse events (AEs) and serious adverse events (SAEs),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

Secondary

MeasureTime frameDescription
ConcentrationFrom administration to Cycle2 , up to 4 months.Plasma concentrations of HRS-6209 during multiple dosing, directly observed from data.
Cmax,ssFrom 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.
Cmin,ssFrom 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.
Objective Response Rate (ORR)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.
Best of Response (DoR)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).
Disease Control Rate (DCR)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.
rPFS (radiographic progression-free survivalScreening 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.

Countries

Australia

Contacts

CONTACTKathy You
kathyyou@atridia.com+61 02 9299 0433
CONTACTRavi Patel
ravi.patel@atridia.com+61 452 363 506

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Aug 12, 2026