Y-mAbs Therapeutics announces publication of preclinical GD2-SADA data at ASCO

Y-mAbs Therapeutics announced the publication of preclinical GD2-SADA data at the 2024 American Society of Clinical Oncology Annual Meeting, taking place May 31 through June 4, 2024, in Chicago, IL. The published abstract titled “Preclinical characterization of pretargeted radioimmunotherapy with GD2-SADA, a self-assembling and disassembling bispecific fusion protein” characterizes the binding properties of GD2-SADA across several GD2-expressing cell lines and lanthanide metal-DOTA complexes, while also demonstrating its anti-tumor efficacy when used with Lutetium 177-DOTA in a two-step approach to pretargeted radioimmunotherapy. In this analysis, GD2-SADA showed tight binding to cell lines expressing GD2, a glycolipid implicated in the malignant transformation of multiple solid tumors. GD2-SADA binding was significantly improved by a p53-derived domain that drives the self-assembly and disassembly of GD2-SADA tetramers, which possess four distinct GD2-binding domains that cumulatively enhance binding. Previous studies have shown that the unbound GD2-SADA protein disassembles over time, facilitating clearance by the kidneys. The analysis further demonstrated high-affinity binding of GD2-SADA to DOTA complexes chelated with lutetium and lanthanum, among other lanthanide metals. By contrast, GD2-SADA showed negligible binding to trace metal-DOTA complexes or empty DOTA, an important consideration for the targeted delivery of the radioactive payload in patients.