Study to Evaluate the Efficacy and Safety of Neoadjuvant Treatment Based on Dual Blockade With Pertuzumab and the Trastuzumab Biosimilar CT-P6 (Herzuma®) in Early HER2-positive Breast Cancer in Routine Clinical Practice

Not Applicable

Completed

• Conditions: Breast Cancer
• Interventions: Drug: Combination of pertuzumab and the trastuzumab biosimilar CT-P6 (Herzuma®) in Her2-positive breast cancer susceptible to neoadjuvant chemotherapy.

• Registration Number: NCT06907082
• Lead Sponsor: Fundacion para la Formacion e Investigacion Sanitarias de la Region de Murcia

Brief Summary

The study hypothesis is to evaluate whether the pCR rate of neoadjuvant chemotherapy and dual blockade with pertuzumab and the trastuzumab biosimilar CT-P6 (Herzuma®) in HER2-positive early breast cancer in PCH is similar to that reported in clinical trials.

Other aspects to be analyzed include the safety of the combination in PCH, as well as the clinical and tumor characteristics of the study population, assessment of radiological and pathological response, and the role of treatment-induced immunogenicity and the value of plasma HER2 determination.

Detailed Description

The study hypothesis is to evaluate whether the pCR rate of neoadjuvant chemotherapy and dual blockade with pertuzumab and the trastuzumab biosimilar CT-P6 (Herzuma®) in HER2-positive early breast cancer in PCH is similar to that reported in clinical trials.

Other aspects to be analyzed include the safety of the combination in PCH, as well as the clinical and tumor characteristics of the study population, assessment of radiological and pathological response, and the role of treatment-induced immunogenicity and the value of plasma HER2 determination.

Study Timeline

• Study Start: 2020-12-28
• Primary Completion: 2024-03-14
• Study Completion: 2024-03-14
• Status Verified: 2025-03
• Study First Submitted: 2025-03-24
• Study First Submitted QC: 2025-03-31
• Last Update Submitted: 2025-03-31
• Study First Posted: 2025-04-02
• Last Update Posted: 2025-04-02

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Female
• Target Recruitment: 106

Inclusion Criteria

• Women aged 18 years or older.
• Diagnosis of HER2-positive breast cancer confirmed by immunohistochemistry (IHC) of 3+ or positive fluorescence in situ hybridization (FISH) result.
• Early stage without systemic dissemination, amenable to neoadjuvant treatment with chemotherapy and dual anti-HER2 blockade with pertuzumab and the trastuzumab biosimilar CT-P6 (Herzuma®) according to the PCH.

No inclusion staging is established, as the indication will be determined based on standard clinical practice.

• Clinical data available in the patient's medical record for collection.
• Provide written informed consent for the study and informed consent for the Biobank.

Exclusion Criteria

• Medical or psychiatric incapacity to provide informed consent.
• Known hypersensitivity to trastuzumab or pertuzumab.
• Current treatment with an investigational drug.
• Participation in a clinical trial that involves adding an investigational drug to the standard neoadjuvant clinical treatment with chemotherapy, pertuzumab, and the trastuzumab biosimilar CT-P6 (Herzuma®).
• Withdrawal of consent to participate in the study. The patient may withdraw their consent at any time without having to justify their decision and without any detriment to their clinical care.
• Patient who does not wish to receive or is not a candidate for oncological treatment with chemotherapy or dual anti-Her2 blockade.
• Patient diagnosed with another prognostically relevant neoplastic disease in the previous two years. The exceptions are carcinoma in situ of the cervix or breast, and basal cell or squamous cell carcinoma of the skin.
• Non-neoplastic disease with a prognosis of less than 1 year.
• Medical condition or patient characteristics that, in the investigator's judgment, pose a high risk of serious complications during treatment.
• Being pregnant or breastfeeding.
• Inability to cooperate and comply with the study protocol.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Combination of pertuzumab and the trastuzumab biosimilar CT-P6 (Herzuma®) in Her2-positive breast ca	Combination of pertuzumab and the trastuzumab biosimilar CT-P6 (Herzuma®) in Her2-positive breast cancer susceptible to neoadjuvant chemotherapy.	Combination of pertuzumab and the trastuzumab biosimilar CT-P6 (Herzuma®) in Her2-positive breast cancer susceptible to neoadjuvant chemotherapy.

Primary Outcome Measures

Name	Time	Method
Pathological complete response (pCR) rate	Up to 18 months	Pathological complete response (pCR) rate in breast and axillary tissue (ypT0/is ypN0) in patients with HER2-positive early breast cancer after receiving neoadjuvant treatment with chemotherapy, pertuzumab and the trastuzumab biosimilar CT-P6 (Herzuma®) according to routine clinical practice.; The standard practice for determining pRC is to follow the Miller and Payne criteria. pRC is considered to be grade 5 in tumor tissue, and grade D in the axilla.

Trial Locations

Locations (1)

HCUVA; 🇪🇸 Murcia, Spain