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Trastuzumab Deruxtecan (T-DXd) Alone or in Sequence With THP, Versus Standard Treatment (ddAC-THP), in HER2-positive Early Breast Cancer

Phase 3
Active, not recruiting
Conditions
Breast Neoplasms
HER2-positive Early Breast Cancer
Breast Cancer
Interventions
Registration Number
NCT05113251
Lead Sponsor
AstraZeneca
Brief Summary

This study will look at the efficacy and safety of trastuzumab deruxtecan (T-DXd) in a neoadjuvant setting, in high-risk, HER2-positive early non-metastatic breast cancer.

Detailed Description

The target population of interest in this study is participants with high-risk HER2-positive early-stage breast cancer. The purpose of this study is to determine the efficacy and safety of T-DXd neoadjuvant therapy.

Participants will be randomised to one of 3 arms: T-DXd monotherapy (Arm A), T-DXd followed by THP (Arm B), or ddAC-THP (Arm C).

Recruitment & Eligibility

Status
ACTIVE_NOT_RECRUITING
Sex
All
Target Recruitment
927
Inclusion Criteria
  • Patients must be at least 18 years of age.
  • Histologically documented HER2-positive early breast cancer (EBC) participants, including clinical stage at presentation (based on mammogram or breast MRI assessment): T0-4 (inclusive of inflammatory breast cancer), N1-3, M0 or ≥ T3, N0, M0 as determined by the AJCC staging system, 8th edition
  • ECOG performance status of 0 or 1 at randomization
  • Adequate organ and bone marrow function
  • LVEF ≥ 50% within 28 days before randomization
  • FFPE tissue block (2 cores) or 20 freshly-cut, serial tumor slides for HER2 assessment by central lab. If blocks are incomplete or fewer than 20 slides are available, participants may be eligible following discussion with the AstraZeneca Study Physician
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Exclusion Criteria
  • prior history of invasive breast cancer
  • stage IV breast cancer (determined by AJCC staging system)
  • any primary malignancy within 3 years (except resected non-melanoma skin cancer, curatively treated in situ disease) Note: This includes a second current breast primary malignancy (ie, bilateral breast cancer)
  • history of DCIS (except those treated with mastectomy >5 years prior to current diagnosis)
  • History of, or current, ILD/pneumonitis
  • Prior systemic therapy for the treatment of breast cancer
  • Previous treatment with anthracyclines, cyclophosphamide or taxanes for any malignancy
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Study & Design

Study Type
INTERVENTIONAL
Study Design
PARALLEL
Arm && Interventions
GroupInterventionDescription
Arm BTrastuzumabT-DXd, followed by THP
Arm CPaclitaxeldoxorubicin and cyclophosphamide, followed by THP
Arm ATrastuzumab DeruxtecanTrastuzumab deruxtecan
Arm BTrastuzumab DeruxtecanT-DXd, followed by THP
Arm BPaclitaxelT-DXd, followed by THP
Arm BPertuzumabT-DXd, followed by THP
Arm CTrastuzumabdoxorubicin and cyclophosphamide, followed by THP
Arm CPertuzumabdoxorubicin and cyclophosphamide, followed by THP
Arm Ccyclophosphamidedoxorubicin and cyclophosphamide, followed by THP
Arm CDoxorubicindoxorubicin and cyclophosphamide, followed by THP
Primary Outcome Measures
NameTimeMethod
rate of pathologic complete response (pCR)Up to 39 months after study start

Proportion of participants who have no evidence by H\&E staining of residual invasive disease

Secondary Outcome Measures
NameTimeMethod
Overall SurvivalUp to 72 months after study start
Invasive Disease-Free Survival (IDFS)Up to 72 months after study start
Event-Free SurvivalUp to 72 months after study start

Trial Locations

Locations (1)

Research Site

🇹🇭

Khon Kaen, Thailand

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