Abstract: The present application provides compositions and methods for treating cancers, including follicular lymphoma, T cell lymphoma and adenoid cystic carcinoma, using an anti-CD137 antibody that specifically binds to an extracellular domain of human CD137. In some embodiment, combination therapies including the anti-CD137 antibody and an immune checkpoint inhibitor, and/or a chemotherapeutic agent are provided. Biomarkers such as total CD137, membrane bound CD137 (mCD137), soluble CD137 (sCD137), CD137 ligand, Ki67, CD8+ effector memory T (Tem) cells, regulatory T (Treg) cells, and natural killer (NK) cell levels for the methods of treatment described herein are also provided.

Abstract: Provided are heterodimeric proteins comprising polypeptides having CH3 domains with engineered residues that form disulfide bonds and/or salt bridges. Also provided are activatable antibodies targeting CD3 and/or HER2. Compositions, methods of manufacture and methods of treatment using the heterodimeric proteins and the activatable antibodies are further provided.