AstraZeneca and Daiichi Sankyo’s Enhertu (trastuzumab deruxtecan) has been recommended for approval in the European Union (EU) as monotherapy for the treatment of adult patients with unresectable or metastatic HER2-low (IHC 1+ or IHC 2+/ISH-) breast cancer who have received prior chemotherapy in the metastatic setting or developed disease recurrence during or within six months of completing adjuvant chemotherapy.

Enhertu is a specifically engineered HER2-directed antibody drug conjugate (ADC) being jointly developed and commercialised by AstraZeneca and Daiichi Sankyo.

The Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency based its positive opinion on results from the DESTINY-Breast04 Phase III trial, which were presented at the American Society of Clinical Oncology 2022 Annual Meeting and simultaneously published in The New England Journal of Medicine.

Susan Galbraith, Executive Vice President, Oncology R&D, AstraZeneca, said: “Enhertu is the first-ever HER2-directed medicine to show a survival benefit in patients with HER2-low metastatic breast cancer, confirming the importance of targeting lower levels of HER2 expression in patients previously classified as HER2-negative. The CHMP’s recommendation is encouraging and supports our ambition to evolve the way breast cancer is classified and treated to ultimately improve patient outcomes.”

Ken Takeshita, Global Head, R&D Daiichi Sankyo, said: “This positive CHMP opinion recognises the unmet need in the European Union for patients with HER2-low metastatic breast cancer. Currently, once patients with HR-positive disease progress on hormone therapy there are limited effective treatments, and few targeted options are available for patients with HR-negative disease. We look forward to the European Commission decision and aim to bring Enhertu to eligible patients as soon as possible.”

The safety profile observed in patients treated with Enhertu in the DESTINY-Breast04 trial was consistent with that seen in other trials of Enhertu in breast cancer with no new safety signals identified.