AstraZeneca and Daiichi Sankyo's Enhertu (trastuzumab deruxtecan) has been approved in the US for the treatment of adult patients with unresectable or metastatic HER2-positive (IHC 3+) solid tumours who have received prior systemic treatment and have no satisfactory alternative treatment options.

This indication is approved under accelerated approval based on objective response rate (ORR) and duration of response (DoR). Continued approval for this indication may be contingent upon verification and description of clinical benefit in a confirmatory trial.

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

The first tumour-agnostic approval of a HER2-directed therapy and ADC by the Food and Drug Administration (FDA) was based on results from the subgroup of patients with HER2-positive IHC 3+ tumours in each of the DESTINY-PanTumor02, DESTINY-Lung01 and DESTINY-CRC02 Phase II trials.

Funda Meric-Bernstam, MD, Chair of Investigational Cancer Therapeutics at The University of Texas MD Anderson Cancer Center, US, said: “Until the approval of trastuzumab deruxtecan, patients with metastatic HER2-positive solid tumours have had limited treatment options. Based on the clinically meaningful response rates seen across clinical trials, this tumour-agnostic approval means that patients may now be treated with a HER2-directed medicine.”

Dave Fredrickson, Executive Vice President, Oncology Business Unit, AstraZeneca, said: “As the first antibody drug conjugate to be granted a tumour-agnostic indication, Enhertu is truly delivering on its potential across metastatic HER2-targetable tumours. This approval also elevates the importance of testing for biomarkers, including HER2, across a broad range of tumours to ensure these patients with advanced cancer who have few options know whether a targeted medicine might be right for them.”

Ken Keller, Global Head of Oncology Business, and President and CEO, Daiichi Sankyo, Inc., said: “This fifth indication in the US is a significant milestone as eligible patients with previously treated metastatic HER2-positive solid tumours may now be treated with Enhertu. The accelerated approval by the FDA for this tumour-agnostic indication is based on the clinically meaningful efficacy seen with Enhertu across numerous types of metastatic cancers.”