“Due to the species specificity of eculizumab, potential pharmacological activities in vivo have been explored with murine antibodies targeting rodent C5. Since there are no murine models of PNH, studies targeting other therapeutic areas with potential involvement of C5 activation (arthritis, lupus, airway inflammation and cardiac allograft models) have been presented.”
Eculizumab binds only human C5 (species specificity) and no murine PNH model exists
“Due to the species specificity of eculizumab, potential pharmacological activities in vivo have been explored with murine antibodies targeting rodent C5. Since there are no murine models of PNH, studies targeting other therapeutic areas with potential involvement of C5 activation (arthritis, lupus, airway inflammation and cardiac allograft models) have been presented.”
CHMP: in vitro-only pharmacodynamic characterisation acceptable given species specificity
“As stated in the CHMP scientific advice and in accordance with ICH S7, the approach to characterize the pharmacodynamic properties of eculizumab by in vitro methods is considered as acceptable in the light of the species specificity.”