MSD/Daiichi Sankyo Withdraw HER3 ADC Marketing Application

On 29 May, MSD and Daiichi Sankyo jointly announced the voluntary withdrawal of their Biologics License Application (BLA) for accelerated approval of the HER3 ADC drug patritumab deruxtecan in the US for treating adults with locally advanced or metastatic EGFR-mutated non-small cell lung cancer (NSCLC) previously treated with two or more systemic therapies. The initial submission was based on Phase II HERTHENA-Lung01 trial results, while the withdrawal decision followed discussions with the local regulator and overall survival (OS) data from the confirmatory Phase III HERTHENA-Lung02 trial, which did not meet statistical significance. Biomarker analyses are being carried out to identify patient subgroups that may benefit from HER3-DXd.

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