Enhertu continues to demonstrate durable responses with new data from DESTINY-Breast01 in HER2-positive metastatic breast cancer.- AstraZeneca + Daiichi Sankyo

Updated results from the positive DESTINY-Breast01 Phase II trial showed AstraZeneca and Daiichi Sankyo Company, Limited (Daiichi Sankyo)’s Enhertu (trastuzumab deruxtecan) continued to demonstrate impressive efficacy and durable responses in patients with HER2-positive metastatic breast cancer following two or more prior HER2-based regimens . The updated data were presented in a Spotlight Poster Discussion at the 2020 San Antonio Breast Cancer Symposium (SABCS).With a median duration of follow-up of 20.5 months, patients treated with Enhertu (5.4 mg/kg) achieved an objective response rate (ORR) of 61.4% and a median duration of response (DoR) of 20.8 months. The median progression-free survival (PFS) was 19.4 months. In an exploratory landmark analysis of overall survival (OS), evaluated at 35% maturity, an estimated 74% of patients remained alive at 18 months.In the previous analysis at 11.1 months of follow-up, an ORR of 60.9% was seen with a median DoR of 14.8 months and median PFS of 16.4 months. Additional trials are ongoing to confirm the results seen in DESTINY-Breast01.Approximately one in five patients with breast cancer are considered HER2 positive, which is associated with aggressive disease, high recurrence rate, and increased mortality. .