Abstract: Provided herein are multispecific antibodies, including trispecific antibodies that bind to CD79b, CD20 and CD3, and bispecific antibodies that bind to CD79b and CD3, and multispecific antigen-binding fragments thereof. Also described are related polynucleotides capable of encoding the provided multispecific antibodies or multispecific antigen-binding fragments, cells expressing the provided multispecific antibodies or multispecific antigen-binding fragments, as well as associated vectors and detectably labeled multispecific antibodies or multispecific antigen-binding fragments. In addition, methods of producing and using the provided multispecific antibodies and multispecific antigen-binding fragments are described. Further provided herein are isolated antibodies that bind to CD79b and antigen-binding fragments thereof.

Abstract: Methods and reagents for determining treatment efficacy of a MALT1 inhibitor in a human subject are described. The method involves determining NF-?B nuclear translocation in stimulated PBMCs of a blood sample obtained from the subject. The method provides information for guiding treatment decisions for those subjects receiving a MALT1 inhibitor therapy, improves the accuracy of optimizing therapy, reduces toxicity, and/or monitors the efficacy of therapeutic treatment.

Abstract: Methods and reagents for determining treatment efficacy of a MALT1 inhibitor in a human subject are described. The method involves determining MALT1 regulated gene expression in stimulated PBMCs of a blood sample obtained from the subject. The method provides information for guiding treatment decisions for those subjects receiving a MALT1 inhibitor therapy, improves the accuracy of optimizing therapy, reduces toxicity, and/or monitors the efficacy of therapeutic treatment.