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A newly created radiolabeled antibody targeting the cancer-associated antigen IL13R?2 has demonstrated remarkable specificity in binding to cancer cells, while sparing healthy tissues. This advancement, tested across various cancer types, shows promise for enhancing tumor detection and treatment through radioimmunotherapy.
The study, published in the April edition of The Journal of Nuclear Medicine, highlights the potential of interleukin-13 receptor ?-2 (IL13R?2) as a target for noninvasive tumor identification. This receptor is frequently present in solid tumors such as glioblastoma, melanoma, and breast cancer, but is minimally expressed in normal tissues, making it an ideal candidate for targeted therapies.
Researchers noted that there are currently no IL13R?2-targeting antibodies utilized for diagnostic and therapeutic purposes available in clinical settings. The development of a radiolabeled antibody aimed at achieving high tumor uptake and retention is a significant step forward, enabling the delivery of targeted radiation to tumors while minimizing exposure to healthy cells.
The research team developed five novel human anti-IL13R?2 antibodies (KLG-1 to KLG-5) and conducted in vitro assessments of their binding properties. Subsequently, an in vivo evaluation using a 89Zr-immuno-PET imaging approach was performed on a glioblastoma mouse model. The KLG-3 antibody emerged as the leading candidate, prompting further studies to assess its efficacy at various mass doses.
Ex vivo biodistribution studies were conducted to establish effective dosimetry for the 177Lu-labeled KLG-3 therapeutic application, which was also tested in a melanoma mouse model. The KLG-3 antibody exhibited highly specific binding to human glioblastoma and melanoma tissues, producing high-contrast PET imaging results with minimal accumulation in off-target healthy tissues. This suggests that the antibody could be a viable candidate for radioimmunotherapy.
Research findings indicate that the targeting capabilities of KLG-3 could lead to innovative treatment options with fewer side effects for patients. The antibody's ability to bind to IL13R?2, a marker associated with immunosuppression, may also assist in identifying patients who could benefit from combined therapeutic strategies.
The advancement in targeting IL13R?2 represents a significant leap forward in cancer therapy, and the continued exploration of antibodies developed in this study could yield highly specific, effective tumor-targeted treatments.
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