title: Enhanced anti-tumor activity of the glycoengineered type II CD20 antibody obinutuzumab (GA101) in combination with chemotherapy in xenograft models of human lymphoma.
abstract: Obinutuzumab (GA101) is a novel glycoengineered type II CD20 antibody in development for non-Hodgkin lymphoma. We compared the anti-tumor activity of obinutuzumab and rituximab in preclinical studies using subcutaneous Z138 and WSU-DLCL2 xenograft mouse models. Obinutuzumab and rituximab were assessed alone and in combination with bendamustine, fludarabine, chlorambucil, doxorubicin and cyclophosphamide/vincristine. Owing to strong single-agent efficacy in these models, suboptimal doses of obinutuzumab were applied to demonstrate a combination effect. Obinutuzumab plus bendamustine achieved superior tumor growth inhibition versus rituximab plus bendamustine and showed a statistically significant effect versus the respective single treatments. Combinations of obinutuzumab with fludarabine, chlorambucil or cyclophosphamide/vincristine demonstrated significantly superior activity to rituximab-based treatment. Obinutuzumab monotherapy was at least as effective as rituximab plus chemotherapy in vivo, and obinutuzumab plus chemotherapy was superior to the respective monotherapies. These data support further clinical investigation of obinutuzumab plus chemotherapy.
authors.affiliation: Discovery Oncology, Pharma Research and Early Development (pRED), Roche Diagnostics GmbH , Penzberg , Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Herting
authors.forename: Thomas
authors.initials: T
authors.lastname: Friess
authors.forename: Sabine
authors.initials: S
authors.lastname: Bader
authors.forename: Gunter
authors.initials: G
authors.lastname: Muth
authors.forename: Gabriele
authors.initials: G
authors.lastname: Hölzlwimmer
authors.forename: Natascha
authors.initials: N
authors.lastname: Rieder
authors.forename: Pablo
authors.initials: P
authors.lastname: Umana
authors.forename: Christian
authors.initials: C
authors.lastname: Klein
mesh_terms: D000818:Animals; D061067:Antibodies, Monoclonal, Humanized / Q000008:administration & dosage / Q000494:pharmacology*; D018951:Antigens, CD20 / Q000378:metabolism; D000970:Antineoplastic Agents / Q000008:administration & dosage / Q000494:pharmacology*; D045744:Cell Line, Tumor; D003520:Cyclophosphamide / Q000008:administration & dosage / Q000494:pharmacology; D004195:Disease Models, Animal; D005260:Female; D006801:Humans; D008223:Lymphoma / Q000188:drug therapy / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D051379:Mice; D047368:Tumor Burden; D014750:Vincristine / Q000008:administration & dosage / Q000494:pharmacology; D023041:Xenograft Model Antitumor Assays
chemical_list: D061067:Antibodies, Monoclonal, Humanized; D018951:Antigens, CD20; D000970:Antineoplastic Agents; D014750:Vincristine; D003520:Cyclophosphamide; C543332:obinutuzumab
keywords: GA101; glycoengineered; non-Hodgkin lymphom; obinutuzumab; rituximab; type II CD20 antibody