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Efficacy and tolerability of a GD2-directed trifunctional bispecific antibody in a preclinical model: Subcutaneous administration is superior to intravenous delivery.
Mol. Cancer Ther. 14, 1877-1883 (2015)
Trifunctional bispecific antibodies (trAb) are novel anticancer drugs that recruit and activate different types of immune effector cells at the targeted tumor. Thus, tumor cells are effectively eliminated and a long-lasting tumor-specific T-cell memory is induced. The trAb Ektomab is directed against human CD3 on T cells and the tumor-associated ganglioside GD2, which is an attractive target for immunotherapy of melanoma in humans. To optimize clinical applicability, we studied different application routes with respect to therapeutic efficacy and tolerability by using the surrogate trAb Surek (anti-GD2 x anti-murine CD3) and a murine melanoma engineered to express GD2. We show that subcutaneous injection of the trAb is superior to the intravenous delivery pathway, which is the standard application route for therapeutic antibodies. Despite lower plasma levels after subcutaneous administration, the same tumor-protective potential was observed in vivo compared to intravenous administration of Surek. However, subcutaneously delivered Surek showed better tolerability. This could be explained by a continuous release of the antibody leading to constant plasma levels and a delayed induction of proinflammatory cytokines. Importantly, the induction of counter-regulatory mechanisms was reduced after subcutaneous application. These findings are relevant for the clinical application of trifunctional bispecific antibodies and possibly also other immunoglobulin constructs.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Epcam X Anti-cd3; Monoclonal-antibody; T-cells; Peritoneal Carcinomatosis; Antitumor Immunity; Malignant Ascites; Accessory Cells; Dendritic Cells; Cancer-patients; Breast-cancer
ISSN (print) / ISBN 1535-7163
Journal Molecular Cancer Therapeutics
Quellenangaben Volume: 14, Issue: 8, Pages: 1877-1883
Publisher American Association for Cancer Research (AACR)
Publishing Place Philadelphia
Reviewing status Peer reviewed