No PNH animal model; complement inhibition (CH50, free C5) in monkey PK/PD and repeat-dose studies plus in vitro RBC lysis
“A pharmacology study in an animal model of PNH was not conducted; however, the Applicant assessed complement inhibition in a pharmacokinetics/pharmacodynamics study and in repeat-dose toxicology studies in monkeys as well as in patients with PNH.”
Rat, mouse and rabbit not pharmacologically relevant; monkey the only relevant species
“These in vitro results confirmed that rat, mice and rabbit were not pharmacologically relevant species and therefore were excluded to be selected as species in the toxicity studies.”
In vitro and monkey CH50 data show C5 binding and inhibition of RBC lysis; expected to reduce complement activation in PNH
“The totality of the in vitro pharmacology, in vitro RBC lysis, and in vivo CH50 activity in nonhuman primates demonstrate that crovalimab binds C5 protein, inhibits C5-dependent RBC lysis, and is expected to reduce uncontrolled C5-dependent complement activation in patients with PNH.”