Daiichi Sankyo has entered into a clinical trial collaboration agreement with Merck KGaA, Darmstadt, Germany and Pfizer, Inc. to evaluate the combination of [fam-] trastuzumab deruxtecan (DS-8201), an investigational HER2 targeting antibody drug conjugate (ADC), in combination with the checkpoint inhibitor avelumab and/or an investigational Merck KGaA, Darmstadt, Germany DNA damage response (DDR) inhibitor, in patients with HER2 expressing or mutated solid tumors.   A separate research collab...