Antitumour activity of the glycoengineered type II anti-CD20 antibody obinutuzumab (GA101) in combination with the MDM2-selective antagonist idasanutlin (RG7388).

Abstract:

OBJECTIVES:To investigate whether the glycoengineered type II anti-CD20 monoclonal antibody obinutuzumab (GA101) combined with the selective MDM2 antagonist idasanutlin (RG7388) offers superior efficacy to monotherapy in treating B-lymphoid malignancies in preclinical models. METHODS:The combined effect of obinutuzumab or rituximab plus idasanutlin on direct cell death/apoptosis induction and antibody-dependent cellular cytotoxicity (ADCC) was evaluated using p53 wild-type Z-138 and DoHH-2 lymphoma cells. Furthermore, whole blood B-cell depletion was analysed, and tumour growth inhibition was evaluated in subcutaneous xenograft models. RESULTS:Idasanutlin induced concentration-dependent death of Z-138 and DoHH-2 cells. At concentrations >10-100 nm, idasanutlin enhanced obinutuzumab-induced death of DoHH-2 and Z-138 cells without negatively impacting obinutuzumab-mediated ADCC, natural killer cell activation or whole blood B-cell depletion. In the Z-138 xenograft model, a suboptimal dose of obinutuzumab with idasanutlin yielded substantial tumour growth inhibition and prolonged survival in a time-to-event analysis. In the DoHH-2 model, idasanutlin plus obinutuzumab showed superior tumour growth inhibition to idasanutlin plus rituximab. CONCLUSIONS:Obinutuzumab plus idasanutlin enhanced cell death of p53 wild-type tumour cells vs. rituximab plus idasanutlin without affecting obinutuzumab-mediated ADCC or B-cell depletion and showed robust antitumour efficacy in xenograft models, strongly supporting the investigation of this combination in clinical trials.

journal_name

Eur J Haematol

authors

Herting F,Herter S,Friess T,Muth G,Bacac M,Sulcova J,Umana P,Dangl M,Klein C

doi

10.1111/ejh.12756

subject

Has Abstract

pub_date

2016-11-01 00:00:00

pages

461-470

issue

5

eissn

0902-4441

issn

1600-0609

journal_volume

97

pub_type

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