RecruitingPhase 1Drug trialA Study of Subcutaneous Trastuzumab Deruxtecan in Participants With Metastatic Solid TumorsThis is a dose escalation, and dose expansion study of T-DXd plus hyaluronidase administered subcutaneously, to assess the safety, tolerability, PK and efficacy of SC T-DXd plus hyaluronidase in participants with metastatic solid tumors.