“General toxicity studies were conducted in cynomolgus monkey, the only pharmacologically relevant species.”
✓ VerifiedFDA pharmacology/toxicology review, p. 5Source ↗
Why that species
Comparable affinity for human and monkey CD25 (KD 0.49 vs 0.42 nM); no activity in rat or mouse lymphocytes
“DAC-HYP had no pharmacological effect on primary lymphocytes isolated from rats or mice. Plasmon surface resonance revealed comparable affinity of DAC-HYP for human (KD = 0.49 nM) and monkey (KD = 0.42 nM) CD25.”
✓ VerifiedFDA pharmacology/toxicology review, p. 31Source ↗
Surrogate molecule
No surrogate; the clinical antibody was tested in cynomolgus monkeys
“There was no pharmacological activity in primary lymphocytes isolated from rodents. All in vivo toxicology studies were, therefore, conducted in cynomolgus monkeys.”
✓ VerifiedFDA pharmacology/toxicology review, p. 22Source ↗