Anti-CD20/CD3 T cell-dependent bispecific antibody for the treatment of B cell malignancies. 2015

Liping L Sun, and Diego Ellerman, and Mary Mathieu, and Maria Hristopoulos, and Xiaocheng Chen, and Yijin Li, and Xiaojie Yan, and Robyn Clark, and Arthur Reyes, and Eric Stefanich, and Elaine Mai, and Judy Young, and Clarissa Johnson, and Mahrukh Huseni, and Xinhua Wang, and Yvonne Chen, and Peiyin Wang, and Hong Wang, and Noel Dybdal, and Yu-Waye Chu, and Nicholas Chiorazzi, and Justin M Scheer, and Teemu Junttila, and Klara Totpal, and Mark S Dennis, and Allen J Ebens
Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA. sun.laura@gene.com.

Bispecific antibodies and antibody fragments in various formats have been explored as a means to recruit cytolytic T cells to kill tumor cells. Encouraging clinical data have been reported with molecules such as the anti-CD19/CD3 bispecific T cell engager (BiTE) blinatumomab. However, the clinical use of many reported T cell-recruiting bispecific modalities is limited by liabilities including unfavorable pharmacokinetics, potential immunogenicity, and manufacturing challenges. We describe a B cell-targeting anti-CD20/CD3 T cell-dependent bispecific antibody (CD20-TDB), which is a full-length, humanized immunoglobulin G1 molecule with near-native antibody architecture constructed using "knobs-into-holes" technology. CD20-TDB is highly active in killing CD20-expressing B cells, including primary patient leukemia and lymphoma cells both in vitro and in vivo. In cynomolgus monkeys, CD20-TDB potently depletes B cells in peripheral blood and lymphoid tissues at a single dose of 1 mg/kg while demonstrating pharmacokinetic properties similar to those of conventional monoclonal antibodies. CD20-TDB also exhibits activity in vitro and in vivo in the presence of competing CD20-targeting antibodies. These data provide rationale for the clinical testing of CD20-TDB for the treatment of CD20-expressing B cell malignancies.

UI MeSH Term Description Entries
D008252 Macaca fascicularis A species of the genus MACACA which typically lives near the coast in tidal creeks and mangrove swamps primarily on the islands of the Malay peninsula. Burmese Long-Tailed Macaque,Crab-Eating Monkey,Cynomolgus Monkey,M. f. aurea,M. fascicularis,Macaca fascicularis aurea,Monkey, Crab-Eating,Monkey, Cynomolgus,Crab-Eating Macaque,Burmese Long Tailed Macaque,Crab Eating Macaque,Crab Eating Monkey,Crab-Eating Macaques,Crab-Eating Monkeys,Cynomolgus Monkeys,Long-Tailed Macaque, Burmese,Macaque, Burmese Long-Tailed,Macaque, Crab-Eating,Monkey, Crab Eating
D008822 Mice, Transgenic Laboratory mice that have been produced from a genetically manipulated EGG or EMBRYO, MAMMALIAN. Transgenic Mice,Founder Mice, Transgenic,Mouse, Founder, Transgenic,Mouse, Transgenic,Mice, Transgenic Founder,Transgenic Founder Mice,Transgenic Mouse
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013601 T-Lymphocytes Lymphocytes responsible for cell-mediated immunity. Two types have been identified - cytotoxic (T-LYMPHOCYTES, CYTOTOXIC) and helper T-lymphocytes (T-LYMPHOCYTES, HELPER-INDUCER). They are formed when lymphocytes circulate through the THYMUS GLAND and differentiate to thymocytes. When exposed to an antigen, they divide rapidly and produce large numbers of new T cells sensitized to that antigen. T Cell,T Lymphocyte,T-Cells,Thymus-Dependent Lymphocytes,Cell, T,Cells, T,Lymphocyte, T,Lymphocyte, Thymus-Dependent,Lymphocytes, T,Lymphocytes, Thymus-Dependent,T Cells,T Lymphocytes,T-Cell,T-Lymphocyte,Thymus Dependent Lymphocytes,Thymus-Dependent Lymphocyte
D015448 Leukemia, B-Cell A malignant disease of the B-LYMPHOCYTES in the bone marrow and/or blood. B-Cell Leukemia,B-Lymphocytic Leukemia,Leukemia, Lymphocytic, B-Cell,Lymphocytic Leukemia, B-Cell,Leukemia, Lymphocytic, B Cell,B Cell Leukemia,B Lymphocytic Leukemia,B-Cell Leukemias,B-Cell Lymphocytic Leukemia,B-Cell Lymphocytic Leukemias,B-Lymphocytic Leukemias,Leukemia, B Cell,Leukemia, B-Cell Lymphocytic,Leukemia, B-Lymphocytic,Leukemias, B-Cell,Leukemias, B-Cell Lymphocytic,Leukemias, B-Lymphocytic,Lymphocytic Leukemia, B Cell,Lymphocytic Leukemias, B-Cell
D017252 CD3 Complex Complex of at least five membrane-bound polypeptides in mature T-lymphocytes that are non-covalently associated with one another and with the T-cell receptor (RECEPTORS, ANTIGEN, T-CELL). The CD3 complex includes the gamma, delta, epsilon, zeta, and eta chains (subunits). When antigen binds to the T-cell receptor, the CD3 complex transduces the activating signals to the cytoplasm of the T-cell. The CD3 gamma and delta chains (subunits) are separate from and not related to the gamma/delta chains of the T-cell receptor (RECEPTORS, ANTIGEN, T-CELL, GAMMA-DELTA). Antigens, CD3,CD3 Antigens,T3 Antigens,CD3 Antigen,T3 Antigen,T3 Complex,Antigen, CD3,Antigen, T3,Antigens, T3
D051379 Mice The common name for the genus Mus. Mice, House,Mus,Mus musculus,Mice, Laboratory,Mouse,Mouse, House,Mouse, Laboratory,Mouse, Swiss,Mus domesticus,Mus musculus domesticus,Swiss Mice,House Mice,House Mouse,Laboratory Mice,Laboratory Mouse,Mice, Swiss,Swiss Mouse,domesticus, Mus musculus
D018033 Antibodies, Bispecific Antibodies, often monoclonal, in which the two antigen-binding sites are specific for separate ANTIGENIC DETERMINANTS. They are artificial antibodies produced by chemical crosslinking, fusion of HYBRIDOMA cells, or by molecular genetic techniques. They function as the main mediators of targeted cellular cytotoxicity and have been shown to be efficient in the targeting of drugs, toxins, radiolabeled haptens, and effector cells to diseased tissue, primarily tumors. Bifunctional Antibodies,Bispecific Antibodies,Bispecific Monoclonal Antibodies,Antibodies, Bifunctional,Antibodies, Bispecific Monoclonal,Monoclonal Antibodies, Bispecific
D018951 Antigens, CD20 Unglycosylated phosphoproteins expressed only on B-cells. They are regulators of transmembrane Ca2+ conductance and thought to play a role in B-cell activation and proliferation. CD20 Antigens,CD20 Antigen,Antigen, CD20

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