RecruitingPhase 1Biological interventionStudy of XmAb®819 in Subjects With Advanced Clear Cell Renal Cell CarcinomaThe purpose of this study is to assess the safety and tolerability of XmAb®819 administered intravenous (IV) or subcutaneous (SC) in subjects with relapsed or refractory clear cell renal cell carcinoma and to identify the minimum safe and biologically active dose and the recommended dose (RD).