Randomized Phase II Study Comparing Adjuvant T-DM1 Followed by Subcutaneous Trastuzumab Versus Paclitaxel with Subcutaneous Trastuzumab for Stage I HER2-Positive Breast Cancer

What this Trial Is About

This trial focuses on both women and men diagnosed with Stage I HER2-positive invasive breast cancer. It aims to compare two different combinations of HER2-targeted therapies given after surgery, studying how well each treatment controls the cancer and their side effects. The study is a randomized phase II trial supported by Genentech and led by the Dana-Farber Cancer Institute, evaluating long-term benefits and disease-free survival over several years. Participants are randomly assigned to one of two groups. One group receives six cycles of intravenous trastuzumab-emtansine T-DM1 every three weeks, followed by eleven cycles of subcutaneous trastuzumab every three weeks. The other group receives weekly intravenous paclitaxel for twelve weeks along with subcutaneous trastuzumab every three weeks, continuing trastuzumab alone for additional cycles. The entire treatment period lasts about one year. During the study, participants undergo screening and regular laboratory evaluations along with follow-up visits. Researchers monitor side effects, quality of life, symptoms related to therapy, and cardiac function. The main outcomes measured include the incidence of toxicities during the first 18 weeks and disease-free survival over up to 72 months. Participants are followed for five years after treatment to assess long-term outcomes and safety.

ATEMPT 2.0: Adjuvant T-DM1 vs TH