Functionally active in mouse, rabbit and monkey (3.8-, 2.7-, 10-fold less potent than human); inactive in rat
“OMS721 displayed functional activity in mouse, rabbit, and cynomolgus monkey, with potencies 3.8, 2.7 and 10-fold less than human. No functional activity was observed in rats.”
FDA: partial C-activation mitigation and delayed thrombosis in models, but insufficient evidence of translation to clinical benefit
“Although there appears to be partial mitigation of C-activation and delay in thrombotic onset by narsoplimab in animal and in vitro models, the Applicant has not shown sufficient evidence that this is expected to translate into a measurable clinical benefit, either directly or indirectly.”