Phase III Trial of Neoadjuvant Durvalumab Plus Chemotherapy Versus Chemotherapy Alone for Adults with MammaPrint High 2 Risk Hormone Receptor Positive HER2 Negative Stage II-III Breast Cancer

What this Trial Is About

Researchers are evaluating whether adding the immunotherapy drug durvalumab to the usual chemotherapy treatment can improve outcomes for adults with MammaPrint High 2 Risk MP2 stage II-III hormone receptor positive, HER2 negative breast cancer. This phase III trial compares standard chemotherapy alone to chemotherapy combined with durvalumab. Previous evidence suggests patients with this specific cancer profile may respond better to chemotherapy and immunotherapy, so this study aims to see if durvalumab helps prevent cancer from returning. Participants are first screened with MammaPrint testing on tumor tissue to confirm MP2 status. Those eligible are then randomly assigned to one of two treatment groups. One group receives paclitaxel intravenously on days 1 and 8 every 14 days for 6 cycles, followed by doxorubicin and cyclophosphamide every 14 days for 4 cycles. The other group receives the same chemotherapy schedule plus durvalumab intravenously during specific cycles. Mammography is done during screening, and optional tumor tissue and blood samples are collected throughout the study. During the trial, participants undergo regular assessments including mammograms, tissue biopsies, and blood tests to monitor response and safety. Researchers measure event-free survival, pathologic complete response, residual cancer burden, distant relapse-free survival, and overall survival for up to 10 years after treatment. Quality of life is also evaluated through questionnaires during and after treatment. Participants are followed long-term to track outcomes and side effects.

Adding an Immunotherapy Drug, MEDI4736 (Durvalumab), to the Usual Chemotherapy Treatment (Paclitaxel, Cyclophosphamide, and Doxorubicin) for Stage II-III Breast Cancer