“In pharmacology studies in non-obese diabetic (NOD) mice, a model of spontaneous autoimmune development of diabetes, a single 5-day treatment cycle with the surrogate delayed the onset and reduced the incidence of diabetes by approximately 5 weeks and 30%, respectively.”
✓ VerifiedFDA pharmacology/toxicology review, p. 7Source ↗
Why that model
CD3 poorly conserved; teplizumab binds only human, gorilla, chimpanzee and gibbon CD3
“CD3 is poorly conserved across species. Teplizumab cross-reacts only with human, gorilla, chimpanzee, and gibbon CD3+ T cells.”
✓ VerifiedFDA pharmacology/toxicology review, p. 9Source ↗
Reviewer's view of the efficacy data
EMA: package limited; teplizumab active only in chimpanzee, so most knowledge comes from the mouse surrogate
“The non-clinical package is limited by that fact that teplizumab being only pharmacologically active in the chimpanzee (in addition to humans) and therefore most knowledge comes from studies with a mouse surrogate CD3 monoclonal antibody.”