Rabbit and dog (IVT ocular studies); rat and cynomolgus monkey (7-day IV); monkey the only pharmacologically relevant species
“The monkey is the only species identified that could be considered relevant showing 1/10th of the ARC1905 in an in vitro activity assay against human C5.”
✓ VerifiedFDA pharmacology/toxicology review, p. 35Source ↗
Why that species
Human C5 aptamer: monkey 1/10th and rat 1/1000th of human activity; rabbit/dog expected very low activity but accepted for ocular tolerability
“The ocular studies were conducted in rabbit and dogs, which, as the Applicant indicated, are species in which ARC1905 is expected to have very low activity.”
✓ VerifiedFDA pharmacology/toxicology review, p. 35Source ↗
Surrogate molecule
No surrogate; clinical aptamer (ARC1905) tested in non-pharmacologically-relevant ocular species plus IV monkey
“There are no animal species in which the human anti-C5 aptamer can be tested in ocular toxicity studies for effects stemming from C5 binding.”
✓ VerifiedFDA pharmacology/toxicology review, p. 36Source ↗