ShortStop-HER2: 12 Months vs. 6 Months of HER2-targeted Medications for People With HER2+ Breast Cancer Who Had a Pathologic Complete Response After Chemotherapy Plus Trastuzumab

Summary

This phase III trial compares 6 months of human epidermal growth factor receptor 2 (HER2)-targeted therapy to 12 months of HER2-targeted therapy for the treatment of HER2-positive (+) breast cancer in patients that had a pathologic complete response (pCR) after preoperative (neoadjuvant) chemotherapy with trastuzumab. Trastuzumab and pertuzumab are monoclonal antibodies and forms of targeted therapy that attach to a receptor protein called HER2. HER2 is found on some cancer cells.

Shortened from the sponsor's brief summary. View official record on ClinicalTrials.gov

Conditions studied

• Anatomic Stage I Breast Cancer AJCC v8
• Anatomic Stage II Breast Cancer AJCC v8
• Early Stage HER2+ Breast Cancer

Eligibility basics and study details

Study type

Interventional

Phase

Phase 3

Ages

18 years and older

Sex

All

Healthy volunteers

Not accepted

Sponsor

Alliance for Clinical Trials in Oncology

Last updated on ClinicalTrials.gov

October 2, 2026

These are the basic criteria only. The full inclusion and exclusion criteria are on the official record, and the study team decides who can take part.

US recruiting sites

+447 more sites listed on ClinicalTrials.gov