Mouse and rat AIP disease models: givosiran prevented and reduced phenobarbital-induced ALA and PBG
“Four weekly administrations of the subcutaneous 3 mg/kg dose of givosiran prevented the production of ALA and PBG and a single subcutaneous dose (20 mg/kg in mice and 10 mg/kg in rats) of givosiran reduced ALA and PBG in both the mouse and rat models of AIP.”
✓ VerifiedFDA multi-discipline review, p. 26Source ↗
Why that model
Givosiran is pharmacologically active in rats and monkeys (not rabbits)
“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 ↗
Reviewer's view of the efficacy data
EMA: proof of principle supported (ALAS1, ALA, PBG reduction), but monthly clinical regimen not tested in animals
“The pharmacodynamic studies support the proof of principle that givosiran can reduce liver ALAS1 mRNA and subsequently serum ALA and PGB levels. However, the intended clinical treatment regimen of once per month has not been tested in animals.”