Abstract
Background: Interleukin-13 (IL-13) receptors are overexpressed in glioblastoma multiforme (GBM). The presence of IL-13 binding sites in GBM and their absence in normal brain tissue validates IL-13 receptor as an important target in human GBM. Objective: This review discusses the bench-to-bedside experience with a recombinant cytotoxin composed of human IL-13 and a truncated form of Pseudomonas exotoxin A (PE38QQR), delivered via convection-enhanced delivery (CED), in GBM treatment. Methods: The authors review publications regarding the laboratory research and clinical development of IL-13-directed therapies and summarize the future of IL-13-targeted cytotoxin. Conclusion: The IL-13 receptor remains an important potential target in GBM, and preliminary experience with the IL-13–PE38QQR cytotoxin (also called cintredekin besudotox) has helped to pave the way for study of CED as an important means of drug delivery to malignant gliomas. Ongoing analysis of recently completed clinical trials will determine the future of this agent and its potential therapeutic targets.
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