Provided herein are multi-chain chimeric polypeptides that include: (a) a first chimeric polypeptide including a first target-binding domain, a soluble tissue factor domain, and a first domain of a pair of affinity domains; and (b) a second chimeric polypeptide including a second domain of a pair of affinity domains and a second target-binding domain, where the first chimeric polypeptide and the second chimeric polypeptide associate through the binding of the first domain and the second domain of the pair of affinity domains. Also provided here are methods of using these multi-chain chimeric polypeptides and nucleic acids encoding these multi-chain chimeric polypeptides.

Multi-specific binding proteins that bind to and kill human cancer cells expressing CD33 (Siglec-3) are described, as well as pharmaceutical compositions and therapeutic methods useful for the treatment of CD33 expressing cancer. The invention relates to multi-specific binding proteins that bind to human cancer cells expressing CD33, and exhibit high potency and maximum lysis of target cells compared to anti-CD33 monoclonal antibodies.

Described herein are hybrid antibodies targeted for use in the treatment of cancer. The antibodies have binding capabilities for Fcε receptors and the neonatal Fc receptor, which may be achieved e.g. by replacing sequences or amino acids in IgE constant domain with corresponding sequences and amino acids derived from IgG.

The present invention provides a cell-based assay for measuring T cell activation mediated by a T cell-dependent bispecific antibody (TDB). In some aspects, the assay is useful for detecting a TDB in a composition, quantitating the amount of TDB in a composition, determining the potency and/or specificity of a TDB, or determining if a population of cells expresses a target antigen. Compositions and kits are also contemplated.

Described are tetravalent, bispecific EGFR/CD16A antigen-binding proteins for engaging NK-cells towards EGFR-positive cells. EGFR/CD16A antigen-binding proteins with different pharmacokinetic (PK) properties are described. Further described is the use of bispecific EGFR/CD16A antigen-binding proteins for the treatment of an EGFR-positive malignancy, such as EGFR-positive tumors.

The present disclosure provides antigen-binding proteins which bind to Claudin-18.2 (CLDN18.2); bispecific antigen-binding proteins which bind to CLDN18.2 and a second antigen; and conjugates thereof. In various aspects, the antigen-binding proteins bind to Extracellular Loop 1 (EL1) of the extracellular domain of CLDN18.2. Related polypeptides, nucleic acids, vectors, host cells, and conjugates are further provided herein. Kits and pharmaceutical compositions comprising such entities are moreover provided. Also provided are methods of making an antigen-binding protein and methods of treating a subject having cancer.

This disclosure provides a multimeric binding molecule, e.g., an IgM, IgM-like, IgA, or IgA-like binding molecule, e.g., an antibody with enhanced selectivity for cells expressing a target antigen at high density, e.g., tumor cells. Enhanced selectivity can be achieved, e.g., through modulation of binding affinity for the target antigen and/or through adjusting avidity via multimeric antigen binding.

Disclosed herein are agonistic anti-CD137 antibodies and methods of using such for eliciting CD137 signaling, thereby enhancing immune responses such as T cell functions. The antibodies disclosed within may be used to treat diseases, such as cancer and immune disorders.

The present invention provides compositions comprising molecules having multispecificity and method of their use.

Described herein are hybrid antibodies targeted for use in the treatment of cancer. The antibodies have binding capabilities for Fcε receptors and Fcγ receptors, which may be achieved e.g. by grafting heavy chain constant domain sequences (e.g. CH2 and CH3 domains) derived from IgG to IgE.