“the murine surrogate molecule BB5.1 was administered to mice due to lack of pharmacologic activity of ALXN1210 in mice.”
✓ VerifiedFDA multi-discipline review, p. 40Source ↗
Why that species
No binding or pharmacologic activity against C5 of any non-human species, per epitope mapping, sequence alignment and in vitro assays
“Neither ALXN1210 nor eculizumab exhibit detectable pharmacological activity against any non‐human species tested, as was predicted by epitope mapping studies and sequence alignments of human and non‐human C5 molecules, and confirmed by in vitro binding and activity studies.”
✓ VerifiedFDA multi-discipline review, p. 32Source ↗
Surrogate molecule
Yes: murine anti-mouse C5 antibody BB5.1, used for all mouse repeat-dose and reproductive toxicity studies
“the murine surrogate molecule BB5.1 was administered to mice due to lack of pharmacologic activity of ALXN1210 in mice.”
✓ VerifiedFDA multi-discipline review, p. 40Source ↗