Clinical Trial of TQB3126 for Safety, Tolerability, Pharmacokinetics and Preliminary Efficacy in Breast Cancer Subjects

July 7, 2026 updated by: Chia Tai Tianqing Pharmaceutical Group Co., Ltd.

Phase I/II Clinical Trial to Evaluate the Safety, Tolerability, Pharmacokinetics and Preliminary Efficacy of TQB3126 in Subjects With Breast Cancer

The trial comprises Phase I dose escalation/expansion and Phase II combination therapy. Using a multicenter, open-label, non-randomized design, breast cancer patients will receive TQB3126 to assess its safety, tolerability, pharmacokinetics and preliminary efficacy.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Not yet 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.
306

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 2
  • 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 Locations

  • China
    • Guangdong
      • Guangzhou, Guangdong, China, 510288
        • Sun Yat-sen Memorial Hospital, Sun Yat-Sen University
        • Contact:
      • Meizhou, Guangdong, China, 514000
        • Meizhou People's Hospital
        • Contact:
    • Hubei
      • Wuhan, Hubei, China, 430000
        • Zhongnan Hospital of Wuhan University
        • Contact:
    • Hunan
      • Changsha, Hunan, China, 410000
        • The Third Xiangya Hospital of Central South University
        • Contact:
    • Sichuan
      • Chengdu, Sichuan, China, 610041
        • Sichuan Cancer Hospital
        • Contact:
    • Tianjin Municipality
      • Tianjin, Tianjin Municipality, China, 300202
        • Tianjin Medical University Cancer Institute & Hospital
        • Contact:

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. Subjects voluntarily participate in this study, sign the informed consent form, and demonstrate good treatment compliance.
  2. Aged 18 to 75 years at the time of informed consent signature; Eastern Cooperative Oncology Group (ECOG) performance status (PS) score of 0 or 1; estimated survival expectancy of more than 3 months.
  3. Histopathologically confirmed breast cancer.
  4. Documented disease progression confirmed by clinical or imaging evidence during or after the most recent prior systemic therapy prior to the first study drug administration.
  5. Have evaluable lesions per RECIST v1.1 criteria (measurable lesions; or bone-only metastases with at least one osteolytic or mixed lesion).
  6. Adequate tissue samples shall be provided at screening for gene mutation testing to clarify genetic status.
  7. Laboratory test results meet the criteria specified in the protocol (blood routine, liver and renal function, coagulation function, cardiac ultrasound Left Ventricular Ejection Fraction(LVEF) and other indicators are all within the protocol-specified ranges).
  8. Subjects of childbearing potential must agree to use effective contraceptive measures throughout the study and for 6 months after study completion (the same requirement applies to male subjects); serum or urine pregnancy test result is negative within 7 days prior to enrollment.

Exclusion Criteria:

  1. Other malignant tumors within 5 years prior to first dose, except those cured by single surgical treatment with at least 5 years of disease-free survival, or cured differentiated thyroid cancer, cervical carcinoma in situ, non-melanoma skin cancer, or superficial bladder tumors.
  2. Conditions affecting intravenous access or blood sampling, or multiple factors affecting oral drug administration/absorption (e.g., inability to swallow, chronic diarrhea, intestinal obstruction).
  3. Unresolved toxicity from prior therapy of Grade >1 (CTCAE v6.0), except Grade 2 alopecia, Grade 2 anemia, clinically insignificant laboratory abnormalities, or hypothyroidism stable on hormone replacement therapy.
  4. Major surgery, significant traumatic injury within 4 weeks before first dose, anticipated need for major surgery during the study, or long-standing unhealed fracture.
  5. Any bleeding event of Grade >=3 within 4 weeks before first dose.
  6. Arterial/venous thrombotic events within 6 months before first dose (e.g., cerebrovascular accident, deep vein thrombosis, pulmonary embolism), excluding catheter-related or superficial venous thrombosis.
  7. Active viral hepatitis that is poorly controlled (Hepatitis B Virus (HBV)/Hepatitis C Virus (HCV)-infected subjects meeting protocol-specified criteria may be enrolled).
  8. Active syphilis infection requiring treatment.
  9. Active tuberculosis, idiopathic pulmonary fibrosis, organizing pneumonia, drug-induced or radiation pneumonitis requiring treatment, or history of/current interstitial lung disease (ILD).
  10. History of psychotropic substance abuse unable to be discontinued, mental disorders, epilepsy requiring treatment, or severe psychiatric/neurological disease.
  11. Planned or prior allogeneic bone marrow or solid organ transplantation.
  12. Decompensated cirrhosis (Child-Pugh Class B or C) or history of hepatic encephalopathy.
  13. Significant cardiovascular disease, including New York Heart Association(NYHA) Class >II heart failure, clinically significant ventricular arrhythmia, unstable angina, myocardial infarction within 12 months, markedly prolonged QT interval corrected by Fridericia's formula (QTcF), or personal/family history of congenital long QT syndrome.
  14. Poorly controlled hypertension (resting systolic BP >=160 mmHg or diastolic BP >=100 mmHg on at least 2 measurements >=24 hours apart).
  15. Active or uncontrolled serious infection (Grade >=2).
  16. Renal failure requiring hemodialysis or peritoneal dialysis; or history of/current nephrotic syndrome (except cured) or chronic nephritis.
  17. History of immunodeficiency, including HIV infection or other acquired/congenital immunodeficiency diseases.
  18. Poorly controlled autoimmune disease requiring immunosuppressants or systemic corticosteroids for immunosuppression, continued within 7 days before first dose (except low-dose corticosteroids).
  19. Clinically significant endometrial abnormalities (including hyperplasia, dysfunctional uterine bleeding, etc.).
  20. Tumor-related conditions/treatments: anti-cancer therapy within 3 weeks before first dose or still within the drug's washout period; prior local radiotherapy not meeting protocol-specified interval or target lesion requirements; use of National Medical Products Administration (NMPA)-approved proprietary Chinese medicine with anti-tumor indications within 1 week before first dose; imaging showing tumor invasion of major vessels with risk of fatal hemorrhage; uncontrolled pleural effusion/ascites/moderate-or-greater pericardial effusion requiring repeated drainage; known leptomeningeal metastasis or uncontrolled brain metastasis symptoms; severe skeletal-related events due to bone metastases.
  21. Known hypersensitivity to the study drug or its excipients.
  22. Participation in and use of another investigational anti-tumor drug within 4 weeks before first dose.
  23. Any concomitant disease or condition that, in the investigator's judgment, seriously endangers subject safety or study compliance, or any other reason making the subject unsuitable for enrollment.

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: TQB3126
Administered in accordance with the protocol
Drug: TQB3126
TQB3126 is a targeted protein degrader.

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
Dose Limiting Toxicity (DLT)
Time Frame: From first dose of TQB3126 to the end of Cycle 1, approximately 35 days.
DLT is defined as toxicities that meet pre-defined severity criteria (according to the NCI Common Terminology Criteria for Adverse Events (CTCAE) version 6.0) and are assessed as related to TQB3126, occurring from the first dose to the end of the first treatment cycle.
From first dose of TQB3126 to the end of Cycle 1, approximately 35 days.
Maximum Tolerated Dose (MTD)
Time Frame: From first dose of TQB3126 to the end of Cycle 1, approximately 35 days.
MTD is defined as the highest dose at which DLT occurs in less than 33% of subjects.
From first dose of TQB3126 to the end of Cycle 1, approximately 35 days.
Recommended Phase II Dose (RP2D)
Time Frame: Observation is expected to continue through Cycle 6 Day 28 throughout the study, around 6 months.
The dose recommended for Phase II study based on integrated safety, tolerability, pharmacokinetic and efficacy data.
Observation is expected to continue through Cycle 6 Day 28 throughout the study, around 6 months.
Adverse Events (AEs)
Time Frame: From the time of first dose of TQB3126 to 28 days after the last dose or until the start of other anti-tumor therapy, whichever occurs first.
The occurrence, incidence and severity of all adverse events (AEs).
From the time of first dose of TQB3126 to 28 days after the last dose or until the start of other anti-tumor therapy, whichever occurs first.
Serious Adverse Events (SAEs)
Time Frame: From the time of first dose of TQB3126 to 28 days after the last dose or until the start of other anti-tumor therapy, whichever occurs first.
The occurrence, incidence and severity of all serious adverse events (SAEs).
From the time of first dose of TQB3126 to 28 days after the last dose or until the start of other anti-tumor therapy, whichever occurs first.
Abnormal Incidence of Laboratory Test Indicators
Time Frame: From the time of first dose of TQB3126 to 28 days after the last dose or until the start of other anti-tumor therapy, whichever occurs first.
Incidence and severity of abnormal laboratory values.
From the time of first dose of TQB3126 to 28 days after the last dose or until the start of other anti-tumor therapy, whichever occurs first.
Objective Response Rate (ORR)
Time Frame: From the date of first dose until the date of first documented disease progression, assessed up to approximately 3 years.
The proportion of subjects with a best overall response of complete response (CR) or partial response (PR) according to RECIST v1.1.
From the date of first dose until the date of first documented disease progression, assessed up to approximately 3 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
Peak Concentration (Cmax)
Time Frame: Escalation: pre-dose+0.5,1,2,3,4,6,8,12,24,48,72,120 hours post single dose (Cycle0); pre-dose Cycle1 Day1. Expansion/combo: pre-dose+0.5-12 hours Cycle1 Day1; 24 hours Day2. All: pre-dose Day 7,14,21; pre-dose+0.5-12 hours Day 28; pre-dose Cycle2 Day1.
Maximum observed plasma concentration of TQB3126.
Escalation: pre-dose+0.5,1,2,3,4,6,8,12,24,48,72,120 hours post single dose (Cycle0); pre-dose Cycle1 Day1. Expansion/combo: pre-dose+0.5-12 hours Cycle1 Day1; 24 hours Day2. All: pre-dose Day 7,14,21; pre-dose+0.5-12 hours Day 28; pre-dose Cycle2 Day1.
Time to Reach Maximum Plasma Concentration (Tmax)
Time Frame: Escalation: pre-dose+0.5,1,2,3,4,6,8,12,24,48,72,120 hours post single dose (Cycle0); pre-dose Cycle1 Day1. Expansion/combo: pre-dose+0.5-12 hours Cycle1 Day1; 24 hours Day2. All: pre-dose Day 7,14,21; pre-dose+0.5-12 hours Day 28; pre-dose Cycle2 Day1.
Time to reach the maximum plasma concentration of TQB3126.
Escalation: pre-dose+0.5,1,2,3,4,6,8,12,24,48,72,120 hours post single dose (Cycle0); pre-dose Cycle1 Day1. Expansion/combo: pre-dose+0.5-12 hours Cycle1 Day1; 24 hours Day2. All: pre-dose Day 7,14,21; pre-dose+0.5-12 hours Day 28; pre-dose Cycle2 Day1.
Elimination Half-life (t1/2)
Time Frame: Escalation: pre-dose+0.5,1,2,3,4,6,8,12,24,48,72,120 hours post single dose (Cycle0); pre-dose Cycle1 Day1. Expansion/combo: pre-dose+0.5-12 hours Cycle1 Day1; 24 hours Day2. All: pre-dose Day 7,14,21; pre-dose+0.5-12 hours Day 28; pre-dose Cycle2 Day1.
Elimination half-life of TQB3126 after oral dosing.
Escalation: pre-dose+0.5,1,2,3,4,6,8,12,24,48,72,120 hours post single dose (Cycle0); pre-dose Cycle1 Day1. Expansion/combo: pre-dose+0.5-12 hours Cycle1 Day1; 24 hours Day2. All: pre-dose Day 7,14,21; pre-dose+0.5-12 hours Day 28; pre-dose Cycle2 Day1.
Area Under the Plasma Concentration-time Curve From Time Zero to Time t (AUC0-t)
Time Frame: Escalation: pre-dose+0.5,1,2,3,4,6,8,12,24,48,72,120 hours post single dose (Cycle0); pre-dose Cycle1 Day1. Expansion/combo: pre-dose+0.5-12 hours Cycle1 Day1; 24 hours Day2. All: pre-dose Day 7,14,21; pre-dose+0.5-12 hours Day 28; pre-dose Cycle2 Day1.
Area under the plasma concentration-time curve from time zero to the last measurable concentration.
Escalation: pre-dose+0.5,1,2,3,4,6,8,12,24,48,72,120 hours post single dose (Cycle0); pre-dose Cycle1 Day1. Expansion/combo: pre-dose+0.5-12 hours Cycle1 Day1; 24 hours Day2. All: pre-dose Day 7,14,21; pre-dose+0.5-12 hours Day 28; pre-dose Cycle2 Day1.
Area Under the Plasma Concentration-time Curve From Time Zero Extrapolated to Infinity (AUC0-∞)
Time Frame: Escalation: pre-dose+0.5,1,2,3,4,6,8,12,24,48,72,120 hours post single dose (Cycle0); pre-dose Cycle1 Day1. Expansion/combo: pre-dose+0.5-12 hours Cycle1 Day1; 24 hours Day2. All: pre-dose Day 7,14,21; pre-dose+0.5-12 hours Day 28; pre-dose Cycle2 Day1.
Area under the plasma concentration-time curve from time zero extrapolated to infinity.
Escalation: pre-dose+0.5,1,2,3,4,6,8,12,24,48,72,120 hours post single dose (Cycle0); pre-dose Cycle1 Day1. Expansion/combo: pre-dose+0.5-12 hours Cycle1 Day1; 24 hours Day2. All: pre-dose Day 7,14,21; pre-dose+0.5-12 hours Day 28; pre-dose Cycle2 Day1.
Apparent Clearance (CL/F)
Time Frame: Escalation: pre-dose+0.5,1,2,3,4,6,8,12,24,48,72,120 hours post single dose (Cycle0); pre-dose Cycle1 Day1. Expansion/combo: pre-dose+0.5-12 hours Cycle1 Day1; 24 hours Day2. All: pre-dose Day 7,14,21; pre-dose+0.5-12 hours Day 28; pre-dose Cycle2 Day1.
Apparent total clearance of TQB3126 from plasma.
Escalation: pre-dose+0.5,1,2,3,4,6,8,12,24,48,72,120 hours post single dose (Cycle0); pre-dose Cycle1 Day1. Expansion/combo: pre-dose+0.5-12 hours Cycle1 Day1; 24 hours Day2. All: pre-dose Day 7,14,21; pre-dose+0.5-12 hours Day 28; pre-dose Cycle2 Day1.
Apparent Volume of Distribution (Vz/F)
Time Frame: Escalation: pre-dose+0.5,1,2,3,4,6,8,12,24,48,72,120 hours post single dose (Cycle0); pre-dose Cycle1 Day1. Expansion/combo: pre-dose+0.5-12 hours Cycle1 Day1; 24 hours Day2. All: pre-dose Day 7,14,21; pre-dose+0.5-12 hours Day 28; pre-dose Cycle2 Day1.
Apparent volume of distribution of TQB3126 in plasma.
Escalation: pre-dose+0.5,1,2,3,4,6,8,12,24,48,72,120 hours post single dose (Cycle0); pre-dose Cycle1 Day1. Expansion/combo: pre-dose+0.5-12 hours Cycle1 Day1; 24 hours Day2. All: pre-dose Day 7,14,21; pre-dose+0.5-12 hours Day 28; pre-dose Cycle2 Day1.
Clinical Benefit Rate (CBR)
Time Frame: From the date of first dose until the date of first documented disease progression, assessed up to approximately 3 years.
The proportion of subjects with a best overall response of complete response, partial response, or stable disease lasting a pre-specified minimum duration, per RECIST v1.1.
From the date of first dose until the date of first documented disease progression, assessed up to approximately 3 years.
Disease Control Rate (DCR)
Time Frame: From the date of first dose until the date of first documented disease progression, assessed up to approximately 3 years.
The proportion of subjects with a best overall response of complete response, partial response, or stable disease, per RECIST v1.1.
From the date of first dose until the date of first documented disease progression, assessed up to approximately 3 years.
Duration of Response (DOR)
Time Frame: From the date of first dose until the date of first documented disease progression, assessed up to approximately 3 years.
The time from the first documentation of complete or partial response to the first documentation of disease progression.
From the date of first dose until the date of first documented disease progression, assessed up to approximately 3 years.
Progression-Free Survival (PFS)
Time Frame: From the date of first dose until the date of first documented disease progression, assessed up to approximately 3 years.
The time from the first dose to the first documentation of disease progression or death from any cause, whichever occurs first.
From the date of first dose until the date of first documented disease progression, assessed up to approximately 3 years.
Time to Response (TTR)
Time Frame: From the date of first dose until the date of first documented disease progression, assessed up to approximately 3 years.
The time from the first dose to the first documentation of complete or partial response.
From the date of first dose until the date of first documented disease progression, assessed up to approximately 3 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.
Chia Tai Tianqing Pharmaceutical Group 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 (Estimated)

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.
August 1, 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.
August 1, 2029

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.
August 1, 2030

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).
July 7, 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.
July 7, 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.
July 13, 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.
July 13, 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.
July 7, 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.
April 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.
  • TQB3126-I/II-01

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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