Testing the Ability to Decrease Chemotherapy in Patients with HER2-Positive Breast Cancer Who Have No Remaining Cancer at Surgery after Limited Pre-operative Chemotherapy and HER2-Targeted Therapy
This clinical trial studies how well paclitaxel, trastuzumab, and pertuzumab work in eliminating further chemotherapy after surgery in patients with HER2-positive stage II-IIIa breast cancer who have no cancer remaining at surgery (either in the breast or underarm lymph nodes) after pre-operative chemotherapy and HER2-targeted therapy. Drugs used in chemotherapy, such as 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. Trastuzumab is a form of targeted therapy because it works by attaching itself to specific molecules (receptors) on the surface of tumor cells, known as HER2 receptors. When trastuzumab attaches to HER2 receptors, the signals that tell the cells to grow are blocked and the tumor cell may be marked for destruction by the bodys immune system. Pertuzumab is a monoclonal antibody that may interfere with the ability of tumor cells to grow and spread. Giving paclitaxel, trastuzumab, and pertuzumab may enable fewer chemotherapy drugs to be given without compromising patient outcomes compared to the usual treatment.