Rat and cynomolgus monkey (both pharmacologically active); rabbit inactive (EFD only)
“In addition to being pharmacologically active in humans, based on the nonclinical data described below, givosiran is also pharmacologically active in both rats and monkeys but is not pharmacologically active in rabbits.”
✓ VerifiedFDA multi-discipline review, p. 25Source ↗
Why that species
Lead duplex has complete sequence homology to human and monkey ALAS1; ALAS1 knockdown shown in rat and monkey
“This parent duplex, with complete sequence homology to human and monkey ALAS1, and is therefore expected to be pharmacologically active in each of the indicated species.”
No surrogate; clinical siRNA tested in rat, monkey and (non-responsive) rabbit
“Pharmacodynamics measurement on GD 22 indicated that givosiran did not reduce hepatic ALAS1 transcript levels in pregnant rabbits at any dose level, confirming that givosiran is not pharmacologically active in rabbits.”
✓ VerifiedFDA multi-discipline review, p. 28Source ↗