U3-1402 is an investigational and potential first-in-class HER3-targeting ADC currently in phase 1 clinical development for HER3-positive metastatic or unresectable breast cancer. DS-8201 and U3-1402 have not been approved for any indication in any country. About Daiichi Sankyo Cancer Enterprise The vision of Daiichi Sankyo Cancer Enterprise is to leverage our world-class, innovative science and push beyond traditional thinking in order to create meaningful treatments for patients with cancer. We are dedicated to transforming science into value for patients, and this sense of obligation informs everything we do.