A Phase II/III Clinical Study to Evaluate the Efficacy and Safety of HLX87in Combination With HLX22 or Pertuzumab in the Neoadjuvant Therapy of HER2-Positive Bresat Cancer

NCT07294534 | Not Yet Recruiting Phase 2 DMC

• 1 other identifier: HLX87-BC002
• Study Type: interventional
• Target: 817
• Locations: 0 countries
• Sites: N/A

Brief Summary

The study is being conducted to evaluate the clinical efficacy of HLX87 in combination with HLX22 or pertuzumab vs. TCbHP in the neoadjuvant therapy of HER2-positive early or locally advanced breast cancer.

Conditions

HER2 + Breast Cancer

Outcome Measures

Primary Outcomes (1)

• • Total pathologic complete response (tpCR) rate

  as assessed by the Independent Review Committee (IRC). tpCR is defined as the absence of histological evidence of malignancy in both the primary lesion of breast cancer and regional lymph nodes (i.e., ypT0/Tis, ypN0 in the AJCC staging system, 8th edition).

  up to 24 weeks

Secondary Outcomes (4)

• • tpCR rate assessed by the study site

  up to 24 weeks

• • Breast pathologic complete response (bpCR) rate

  up to 24 weeks

• Objective response rate (ORR)

  up to 24 weeks

• Incidence and severity of adverse events (AEs)

  time from the date of the first dose of study drug until the date of death from any cause, assessed up to 60 months

Study Arms (3)

HLX87+ HLX22

EXPERIMENTAL

Patients will receive the treatment once every 3 weeks (Q3W), for 8 cycles.

Drug: HLX87+HX22

HLX87+ Pertuzumab

EXPERIMENTAL

Patients will receive the treatment once every 3 weeks (Q3W), for 8 cycles.

Drug: HLX87 + Pertuzumab

TCbHP

ACTIVE COMPARATOR

Patients will receive the treatment once every 3 weeks (Q3W), for 6cycles.

Drug: TCbHP

Interventions

HLX87+HX22 DRUG

HLX87 is a novel HER2-targeted ADC with a similar mechanism of action to trastuzumab deruxtecan. HLX22 is a novel monoclonal antibody targeting HER2

HLX87+ HLX22

HLX87 + Pertuzumab DRUG

HLX87 is a novel HER2-targeted ADC with a similar mechanism of action to trastuzumab deruxtecan.

HLX87+ Pertuzumab

TCbHP DRUG

Docetaxel +Carboplatin+Trastuzumab+Pertuzumab+

TCbHP

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• \. Have a full understanding of the study content, process, and possible adverse reactions before the study, and sign the informed consent form (ICF); voluntarily participate in the study; be able to complete the study as per protocol requirements; 2. Aged ≥ 18 years at the time of signing the ICF, male or female; 3. Primary breast cancer meeting the following criteria:
• Histologically confirmed invasive breast cancer;
• Clinical stage (assessed by mammography or MRI): T0-4 (including inflammatory breast cancer), N1-3, M0; or ≥ T3, N0, M0 (according to AJCC 8th edition);
• HER2-positive as determined by the central laboratory, defined as IHC 3+ or IHC 2+ and ISH-positive;
• For unifocal and multifocal tumors (i.e., more than one tumor, all confined to the same quadrant as the primary tumor), at least 1 lesion should be sampled and confirmed as HER2-positive by the central laboratory;
• For multi-centric tumors (i.e., multiple tumors involving two or more quadrants of the breast), 1 lesion should be sampled from each affected quadrant and confirmed as HER2-positive by the central laboratory, and all tested quadrants must be confirmed as HER2-positive;
• Positive or negative for hormone receptors HR (including estrogen receptor \[ER\] and progesterone receptor \[PgR\]) as determined by the central laboratory.
• Note: According to ASCO-CAP guidelines, HR-positive is defined as: ER and/or PgR ≥ 1% cells have nuclear staining; HR-negative is defined as: ER \< 1% cells have nuclear staining and PR \< 1% cells have nuclear staining.
• During the screening period, unstained tumor sections should be provided to the central laboratory for relevant tests according to the laboratory manual.
• \. Consent for surgery after neoadjuvant therapy. 5. Baseline left ventricular ejection fraction (LVEF) ≥ 55% measured by echocardiography (ECHO) or multi-gated acquisition (MUGA) scan (within 28 days prior to the first dose).
• \. No prior systemic anti-tumor treatment for this current breast cancer (including systemic chemotherapy, molecular targeted drug therapy, biological therapy, and other investigational medicinal products).
• \. ECOG PS score of 0-1 within 7 days prior to the first dose. 8. Hepatitis B surface antigen (HBsAg) (-) and hepatitis B core antibody (HBcAb) (-). In case of HBsAg (+) or HBcAb (+), hepatitis B virus deoxyribonucleic acid (HBV-DNA) must be \< 2500 copies/mL or 500 IU/mL or within the reference range of the site.
• \. HCV antibody (-); subjects with HCV antibody (+) must have a negative HCV-RNA test result to be enrolled. Subjects with HBV/HCV co-infection shall be excluded (positive for HBsAg or HBcAb and positive for HCV antibody) 10. HIV antibody (-). 11. Have adequate organ function as defined by the following criteria (no blood transfusions, or treatment with albumin, recombinant human thrombopoietin or colony-stimulating factor \[CSF\] within 14 days prior to the first dose in this study) 12. Female subjects of childbearing potential must have a negative serum pregnancy test result within 7 days prior to the first dose. Female subjects of childbearing potential and male subjects with female partners of childbearing potential are required to take a medically approved contraceptive measure (e.g., intra-uterine contraceptive device, contraceptive pills, or condoms) during the study treatment period and for at least 7 months after the last dose of study treatment.

You may not qualify if:

• \. Past medical history of invasive breast carcinoma. 2. Stage IV (metastatic) breast cancer (per AJCC 8th edition). 3. History of any second malignancy within 3 years prior to signing the ICF, except for early-stage malignancies (carcinoma in situ or stage I tumors) that have received radical treatment, such as non-melanoma skin cancer, cervical carcinoma in situ, localized prostate cancer, ductal carcinoma in situ of the breast, and papillary thyroid carcinoma.
• \. With serious heart disease or medical history, including but not limited to the following conditions:
• Any previous and current heart failure or systolic dysfunction meeting the NYHA criteria;
• High-risk uncontrollable arrhythmia: atrial tachycardia with resting heart rate \> 100 beats/min, significant ventricular arrhythmia (such as ventricular tachycardia), or high-grade atrioventricular block (such as Mobitz II second-degree atrioventricular block or third-degree atrioventricular block);
• Unstable angina or angina requiring antianginal medication
• History of transmural myocardial infarction shown by ECG
• Clinically significant cardiac valvular disease;
• Poorly controlled hypertension (with systolic blood pressure \> 160 mmHg and/or diastolic blood pressure \> 100 mmHg).
• \. Cerebrovascular accident within 6 months prior to the first dose. 6. Use of immunosuppressants within 14 days prior to the first dose, except for intranasal and inhaled corticosteroids, systemic corticosteroids with a dose of less than 10 mg/day of prednisone/prednisolone or equivalent.
• \. Active systemic infection requiring intravenous antibiotics, antivirals, or antifungals within 7 days prior to the first dose.
• \. History of (non-infectious) pneumonitis/interstitial lung disease (ILD) that required steroids, current presence of pneumonitis/ILD, or suspected pneumonitis/ILD cannot be ruled out by imaging during the screening period.
• \. Have a lung-specific intercurrent clinically significant illness including, but not limited to, any underlying pulmonary disorder (i.e., pulmonary embolism within 3 months prior to dosing, severe asthma, severe chronic obstructive pulmonary disease \[COPD\], restrictive pulmonary disease, significant pleural effusion etc.), any autoimmune, connective tissue or inflammatory disorder with pulmonary involvement (e.g., rheumatoid arthritis, Sjogren's syndrome, sarcoidosis etc.), and/or prior pulmonary resection.
• \. Presence of active tuberculosis. 11. Have received treatment with live attenuated vaccines within 30 days prior to the first dose. Note: If the patient is enrolled, live vaccines should not be administered during the study and within 30 days after the last study treatment.
• \. Participation in other clinical studies within 30 days prior to signing the informed consent form. Unless the clinical study is an observational (non-interventional) clinical study or during the follow-up period of an interventional study.
• \. Known history of severe anaphylaxis to macromolecular protein preparations, hypersensitivity to any component in the formulation of the investigational product, or severe hypersensitivity to any excipients of investigational product.

Sponsors & Collaborators

• Shanghai Henlius Biotech: lead

MeSH Terms

Conditions

Breast Neoplasms

Interventions

pertuzumab

Condition Hierarchy (Ancestors)

Neoplasms by Site; Neoplasms; Breast Diseases; Skin Diseases; Skin and Connective Tissue Diseases

Study Officials

• Zhiming Shao, Dr

  Fudan University

  PRINCIPAL INVESTIGATOR

Central Study Contacts

Even Yi, Dr

CONTACT

021-33395800; Yiwen_YI@henlius.com

Study Design

• Study Type: interventional
• Phase: phase 2
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: INDUSTRY
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: December 8, 2025
• First Posted: December 19, 2025
• Study Start: January 27, 2026
• Primary Completion (Estimated): September 30, 2028
• Study Completion (Estimated): February 1, 2030
• Last Updated: December 19, 2025

Record last verified: 2025-12