NOD-scid mice given human C5: >3-fold longer half-life and prolonged haemolysis inhibition vs eculizumab; no disease model
“The findings from this study suggest that in the presence of human C5, ALXN1210 showed more than three-fold extension in half-life compared with eculizumab. In addition, the serum half-life of ALXN1210 relative to eculizumab resulted in increased PD, as evidenced by prolonged haemolytic inhibition.”
No pharmacological activity against C5 of any non-human species (epitope mapping, sequence alignment, 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 ↗
Reviewer's view of the efficacy data
EMA: mouse PK/PD study used an unvalidated assay, so its PK results are not usable
“However, since the analytical method used in this study was not validated, the PK results from this study cannot be regarded as usable for the evaluation of ravulizumab.”