“The cynomolgus monkey was the only nonclinical species demonstrated to be pharmacologically relevant, and the nonclinical program was conducted only in that species.”
✓ VerifiedFDA pharmacology/toxicology review, p. 6Source ↗
Why that species
Comparable binding to monkey and human C1s (EC50 0.13 vs 0.15 nM) and similar hemolysis inhibition; no binding/inhibition in mouse, rat, rabbit, minipig, dog
“Sutimlimab binds cynomolgus monkey and human C1s with comparable affinity (EC50, 0.13 nM and 0.15 nM, respectively)”
✓ VerifiedFDA pharmacology/toxicology review, p. 6Source ↗
Surrogate molecule
No surrogate; the clinical antibody was tested in cynomolgus monkeys
“The cynomolgus monkey was the only nonclinical species demonstrated to be pharmacologically relevant, and the nonclinical program was conducted only in that species.”
✓ VerifiedFDA pharmacology/toxicology review, p. 6Source ↗