Phase II trial of cyclophosphamide, paclitaxel, trastuzumab in stage I-II HER2+ breast cancer completes with 20 patientsCan a shorter, more intense chemo regimen help prevent early-stage HER2-positive breast cancer from returning?

Status: COMPLETED | Phase: PHASE2 Condition(s): HER2 Positive Breast Carcinoma, Stage I Breast Cancer AJCC v7, Stage IA Breast Cancer AJCC v7, Stage IB Breast Cancer AJCC v7, Stage II Breast Cancer AJCC v6 and v7 Intervention(s): Cyclophosphamide (DRUG), Laboratory Biomarker Analysis (OTHER), Paclitaxel (DRUG), Trastuzumab (BIOLOGICAL) This phase II trial studies the side effects and how well cyclophosphamide, paclitaxel, and trastuzumab work when given after surgery in treating patients with stage I-II human epidermal growth factor receptor (HER2/neu) positive breast cancer (confined to the breast or the breast and lymph nodes under the arm). Drugs used in chemotherapy, such as cyclophosphamide and paclitaxel, work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Monoclonal antibodies, such as trastuzumab, may interfere with the ability of tumor cells to grow and spread. Giving cyclophosphamide, paclitaxel, and trastuzumab after surgery may help prevent the cancer from coming back. Detailed: PRIMARY OBJECTIVES: I. To determine the toxicities and ability to complete the planned treatment of a dose-dense regimen of cyclophosphamide and paclitaxel with trastuzumab in subjects with newly diagnosed stage I-II HER2/neu positive breast cancer. II. To estimate recurrence free survival of a dose-dense regimen of cyclophosphamide and paclitaxel with trastuzumab in subjects with newly diagnosed stage I-II HER2/neu positive breast cancer. OUTLINE: SYSTEMIC THERAPY: Patients receive cyclophosphamide intravenously (IV) over 1 hour, paclitaxel IV over 3 hours, and trastuzumab IV over 30-90 minutes on day 1. Treatment repeats every 14 days for 6 courses in the absence of disease progression or unacceptable toxicity. MAINTENANCE TRASTUZUMAB THERAPY: Beginning in course 6, patients receive Primary Outcome(s): Number Participants With Neutropenia, Graded According to the National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE) Version (v)4.03; Number of Participants With Paclitaxel-related Neuropathy, Graded According to the NCI CTCAE v4.03; Number of Participants With Cardiotoxicity Grade 3/4 Cardiotoxicity, Graded According to the NCI CTCAE v4.03 Enrollment: 20 (ACTUAL) Lead Sponsor: University of Nebraska Start: 2015-12-11 | Primary Completion: 2025-12-08 Results posted: 2026-03-23