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Type II (tositumomab) anti-CD20 monoclonal antibody out performs type 1 (rituximab-like) reagents in B-cell depletion regardless of complement activation

Beers, Stephen A., Chan, Claude H.T., James, Sonya, French, Ruth R., Attfield, Katherine E., Brennan, Claire M., Ahuja, Anupama, Shlomchik, Mark J., Cragg, Mark S. and Glennie, Martin J. (2008) Type II (tositumomab) anti-CD20 monoclonal antibody out performs type 1 (rituximab-like) reagents in B-cell depletion regardless of complement activation Blood, 112, (10), pp. 4170-4177. (doi:10.1182/blood-2008-04-149161).

Record type: Article


Anti-CD20 monoclonal antibodies (mAbs) are classified into type I (rituximab-like) or type II (tositumomab-like) based on their ability to redistribute CD20 molecules in the plasma membrane and activate various effector functions. To compare type I and II mAbs directly in vivo and maximize Fc effector function, we selected and engineered mAbs with the same mouse IgG2a isotype and assessed their B-cell depleting activity in human CD20 transgenic mice. Despite being the same isotype, having similar affinity, opsonizing activity for phagocytosis, and in vivo half-life, the type II mAb tositumomab (B1) provided substantially longer depletion of B cells from the peripheral blood compared with the type I mAb rituximab (Rit m2a), and 1F5. This difference was also evident within the secondary lymphoid organs, in particular, the spleen. Failure to engage complement did not explain the efficacy of the type II reagents because type I mAbs mutated in the Fc domain (K322A) to prevent C1q binding still did not display equivalent efficacy. These results give support for the use of type II CD20 mAbs in human B-cell diseases

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Published date: November 2008
Organisations: Cancer Sciences


Local EPrints ID: 73216
ISSN: 0006-4971
PURE UUID: 4b65ae30-a361-4aed-ab16-f35397dee919
ORCID for Mark S. Cragg: ORCID iD

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Date deposited: 03 Mar 2010
Last modified: 18 Jul 2017 23:51

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Author: Claude H.T. Chan
Author: Sonya James
Author: Ruth R. French
Author: Katherine E. Attfield
Author: Claire M. Brennan
Author: Anupama Ahuja
Author: Mark J. Shlomchik
Author: Mark S. Cragg ORCID iD

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