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HR+/HER2- Locally Advanced, Metastatic Breast CancerPhase 3NCT06998108

Study of BEBT-209 in Combination With Fulvestrant Versus Placebo in Combination With Fulvestrant in Patients With HR+/HER2- Locally Advanced or Metastatic Breast Cancer Who Have Progressed After Prior Endocrine Therapy

A Phase 3 study testing BEBT-209 capsules and Fulvestrant Injection in people with HR+/HER2- Locally Advanced, Metastatic Breast Cancer, run by BeBetter Med Inc at 1 site in China.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

This study is a randomized, double-blind, multicenter, placebo-controlled Phase III clinical trial designed to evaluate the efficacy and safety of BEBT-209 in combination with fulvestrant in patients with HR+/HER2- locally advanced or metastatic breast cancer. Read more about this study

Who is it for?
Ages 18 years and older, women only
What is being tested?
BEBT-209 capsules and Fulvestrant Injection
Could I receive a placebo?
Yes, some participants may receive a placebo
How many people
330 participants
Where
1 siteChina
Study dates
9 Jun 2022to 30 Jun 2026
Phase
Phase 3
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • Women only
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Women aged 18 years or older who are postmenopausal or premenopausal/perimenopausal, and meet one of the following criteria: previous bilateral oophorectomy, or age ≥60 years; or age <60 years with natural menopause (defined as spontaneous cessation of regular menstruation for at least 12 consecutive months without other pathological or physiological causes), and estradiol (E2) and follicle-stimulating hormone (FSH) levels in the postmenopausal range; or premenopausal or perimenopausal women willing to receive luteinizing hormone-releasing hormone (LHRH) agonist therapy during the study period.
  • Patients with histologically confirmed HR+/HER2- breast cancer (based on the most recent test results from either recurrent/metastatic lesion tissue samples or prior primary lesion tissue samples): a) ER+ and/or PR+ is defined as ≥10% of tumor cells showing positive staining for ER/PR; b) HER2- is defined as an immunohistochemistry(IHC) score of 0 or 1+, or a fluorescence in situ hybridization(FISH) ratio of HER2/CEP17 less than 2.0, or HER2 gene copy number less than 4.
  • Evidence of focal recurrence or metastasis, not suitable for curative surgery or radiotherapy, and without clinical indications necessitating chemotherapy.
  • Previous endocrine therapy must meet one of the following criteria: a) progression during or within 12 months after discontinuation of adjuvant endocrine therapy (with an aromatase inhibitor [aromatase inhibitor or selective estrogen receptor modulator such as tamoxifen, toremifene, etc.); b) progression during or within 1 month after discontinuation of endocrine therapy for first recurrence or metastasis.
  • Patients are allowed to have received no more than one line of chemotherapy during the recurrence or metastatic phase.
  • Eastern Cooperative Oncology Group (ECOG) performance status score of 0-1.
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  • Presence of measurable lesions according to response evaluation criteria in solid tumors (RECIST) 1.1 criteria or bone metastases only (including lytic or mixed lesions).
  • Adequate organ and marrow function, defined as follows: absolute neutrophil count (ANC) ≥1.5×10⁹/L (without use of growth factors within 14 days); platelets ≥100×10⁹/L (without corrective treatment within 7 days); hemoglobin ≥90 g/L (without corrective treatment within 7 days); serum creatinine ≤1.5 times the upper limit of normal (ULN) or estimated creatinine clearance ≥60 mL/min; aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤2.5 times the ULN (≤5 times the ULN for patients with liver metastases); total serum bilirubin (TBIL) ≤2.5 times the ULN; 12-lead electrocardiogram: Fridericia-corrected QT interval (QTcF) < 470 msec (for females).
  • Women of childbearing potential must have a negative serum pregnancy test within 7 days prior to the first dose of study drug and must be willing to use a medically accepted and highly effective method of contraception from the time of signing the informed consent form, throughout the study period, and for 1 year after the last administration of the study drug.
  • All acute toxicities from prior anti-tumor therapy must have resolved to grade 0-1 (according to national cancer institute(NCI) common terminology criteria for adverse events(CTCAE) version 5.0) or to the levels specified in the inclusion/exclusion criteria. Exceptions include alopecia and other toxicities deemed by the investigator to pose no safety risk to the patient.
  • The patient has provided written informed consent and is willing and able to comply with the planned visits, study treatment schedule, laboratory tests, and other study procedures.

Who cannot join

  • Patients who are deemed by the investigator to be unsuitable for endocrine therapy, including those with symptomatic, visceral metastatic disease, or those at risk of life-threatening complications in the short term (including patients with uncontrollable effusions [pleural, pericardial, peritoneal] despite drainage or other measures, pulmonary lymphangitis, or more than 50% liver involvement).
  • Known uncontrolled or symptomatic active central nervous system (CNS) metastases, characterized by clinical symptoms, brain edema, spinal cord compression, carcinomatous meningitis, leptomeningeal disease, and/or progressive growth; patients with a history of CNS metastases or spinal cord compression may be eligible if they have received definitive treatment and have been clinically stable for 4 weeks after discontinuation of anticonvulsants and corticosteroids prior to the first dose of study drug.
  • Previous treatment with fulvestrant, everolimus, or CDK4/6 inhibitors.
  • From the end of the last treatment to the first dose: underwent surgical or radiation therapy within 14 days prior to the first dose and has not fully recovered from the treatment; received chemotherapy, any investigational drug, or other anti-cancer therapy within 14 days or within five half-lives of the therapeutic agent prior to the first dose (whichever is longer is acceptable for enrollment).
  • A diagnosis of any other malignancy within 3 years prior to randomization, with the exception of non-melanoma skin cancer (basal cell or squamous cell carcinoma) or cervical carcinoma in situ that has been treated with curative intent.
  • Infection with human immunodeficiency virus (HIV) or known acquired immune deficiency syndrome (AIDS); active hepatitis B (patients positive for hepatitis B surface antigen [HBsAg] and with hepatitis B virus DNA [HBV-DNA] levels above the ULN of the local laboratory). Patients with HBV DNA levels above the ULN of the local laboratory are permitted to receive antiviral therapy prior to screening, and may be enrolled once viral copies are reduced below the ULN, but must continue antiviral therapy for hepatitis B during the study; hepatitis C (positive for hepatitis C virus antibody and with HCV RNA levels above the ULN of the local laboratory); or co-infection with both hepatitis B and hepatitis C.
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  • Within 6 months prior to randomization, the following conditions have occurred: myocardial infarction, severe/unstable angina, heart failure of NYHA Class II or higher, persistent arrhythmia of Grade ≥2 (according to NCI CTCAE Version 5.0), atrial fibrillation of any grade, coronary/peripheral artery bypass grafting, symptomatic congestive heart failure, cerebrovascular accident (including transient ischemic attack), or symptomatic pulmonary embolism.
  • Severe infection within 4 weeks prior to the first dose (e.g., requiring intravenous antibiotics, antifungal, or antiviral therapy according to clinical practice guidelines), or unexplained fever >38.5℃ during the screening period or prior to the first dose.
  • Inability to swallow, intestinal obstruction, or other factors that may affect the intake and absorption of medication.
  • Known coagulation abnormalities; or use of anticoagulant therapy prior to intramuscular injection of fulvestrant or LHRH agonist (goserelin).
  • Known allergy to fulvestrant, LHRH agonist (goserelin), BEBT-209/placebo, or any of their excipients.
  • Known history of allogeneic organ transplantation or allogeneic hematopoietic stem cell transplantation.
  • Known history of abuse of psychoactive substances or drug addiction.
  • Poorly controlled diabetes mellitus as judged by the investigator.
  • Uncontrolled hypertension as judged by the investigator.
  • Presence of other severe physical or psychiatric conditions or laboratory abnormalities that may increase the risk of participation in the study, interfere with the study results, or render the patient unsuitable for participation in the study as judged by the investigator.

Trial locations and contacts

1 site in 1 country. Contact the study team or a site near you to ask about taking part.

Kegang Jiang, Master contact

+86-18664786382

kjiang@bebettermed.com

China1 site, 1 recruiting
  • National Cancer Center/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College

    Beijing, Beijing Municipality, 100021

    Fan Zhang, Master, +86-13574805563, fzhang@bebettermed.com

    Recruiting

Other trials in China

About this study

Official title: A Multicenter, Randomized, Controlled, Double-blind Phase III Clinical Study of BEBT-209 in Combination With Fulvestrant Versus Placebo in Combination With Fulvestrant for the Treatment of HR+/HER2- Locally Advanced or Metastatic Breast Cancer in Patients With Disease Progression After Prior Endocrine Therapy

This study is a randomized, double-blind, multicenter, placebo-controlled Phase III clinical trial designed to evaluate the efficacy and safety of BEBT-209 in combination with fulvestrant in patients with HR+/HER2- locally advanced or metastatic breast cancer.

Read the detailed description

This study plans to enroll 330 eligible female patients with locally advanced or metastatic breast cancer. All eligible patients will be randomly assigned to the treatment group or the control group in a 2:1 ratio. The following two factors will be used for stratification: 1) visceral metastasis (yes or no); 2) menopausal status (postmenopausal; premenopausal or perimenopausal). The study consists of a screening period, a treatment period, and a follow-up period. It aims to evaluate the efficacy and safety of BEBT-209 in combination with fulvestrant versus placebo in combination with fulvestrant in patients with HR+/HER2- locally advanced or metastatic breast cancer who have experienced disease progression after prior endocrine therapy.

Being tested
BEBT-209 capsules, BEBT-209 Placebo capluses, Fulvestrant Injection
Keywords
BEBT-209, Efficacy, Safety
Medical subject headings
Breast Neoplasms

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • BEBT-209 capsulesDrug

    Also called BEBT-209

    Oral, 75 mg per dose, twice daily, in a 28-day cycle. Continuous dosing from day 1 to day 21, followed by a rest period from day 22 to day 28.

  • BEBT-209 Placebo caplusesDrug

    Oral, 75 mg per dose, twice daily, in a 28-day cycle. Continuous dosing from day 1 to day 21, followed by a rest period from day 22 to day 28.

  • Fulvestrant InjectionDrug

    500 mg intramuscular injection, with a 28-day treatment cycle. Administration on day 1 and day 15 of the first cycle, and then on day 1 of each subsequent cycle.

Study groups in NCT06998108
Study groupRoleWhat they receive
BEBT-209+ FulvestrantActive comparatorBEBT-209 75 mg twice daily on days 1-21 in combination with fulvestrant 500 mg once daily (day 1 and day 15 of cycle 1; subsequent cycles: day 1).
Receives: Drug: BEBT-209 capsules; Drug: Fulvestrant Injection
BEBT-209 Placebo + FulvestrantPlacebo comparatorPlacebo 75 mg twice daily on days 1-21 in combination with fulvestrant 500 mg once daily (day 1 and day 15 of cycle 1; subsequent cycles: day 1).
Receives: Drug: BEBT-209 Placebo capluses; Drug: Fulvestrant Injection

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. PFS assessed by the Independent Imaging Review Committee

    Progression free survival (PFS) assessed by the Independent Imaging Review Committee

    Measured: Up to 56 weeks

Secondary outcomes (6)
  1. PFS assessed by investigators

    Progression free survival assessed by investigators

    Measured: Up to 56 weeks

  2. OS

    Overall Survival

    Measured: Up to 56 weeks

  3. ORR

    Overall Objective Response

    Measured: Up to 56 weeks

  4. CBR

    Clinical Benefit Rate

    Measured: Up to 56 weeks

  5. DOR

    Duration of Response

    Measured: Up to 56 weeks

  6. Occurrence of Adverse Events (AEs)

    Occurrence of AEs will be graded according to the National Cancer Institute Common Terminology Criteria for Adverse Events Version 5.0 (NCI CTCAE V5.0).

    Measured: Up to 36 months

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted31 May 2025
  2. Study start9 Jun 2022
  3. Primary completion31 Dec 2025 (estimated)
  4. Study completion30 Jun 2026 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 3
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
Double blind
Who is masked
Participant, Investigator
Enrolment
330 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06998108
Sponsor's protocol ID
GBMT-209-P04
Status last verified
May 2025
First submitted
29 May 2025
Last updated
31 May 2025
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No

Questions about this trial

What is this clinical trial studying?

A Phase 3 study testing BEBT-209 capsules and Fulvestrant Injection in people with HR+/HER2- Locally Advanced, Metastatic Breast Cancer, run by BeBetter Med Inc at 1 site in China.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 11 inclusion and 16 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: looking for participants now, as of the sponsor's last update on 31 May 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in China. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Kegang Jiang, Master (+86-18664786382, kjiang@bebettermed.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

PFS assessed by the Independent Imaging Review Committee (time frame: Up to 56 weeks). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 31 May 2025.

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