Cynomolgus monkey only (non-binding species, off-target toxicity assessment)
“The antibody does not bind to its target in animal species typically used in toxicology studies; however, a repeat-dose toxicology study in monkeys was conducted to investigate the potential off-target effects of isatuximab.”
✓ VerifiedFDA multi-discipline review, p. 37Source ↗
Why that species
Binds only human and chimpanzee CD38; no binding to mouse, rat, rabbit, pig, cynomolgus or rhesus CD38; no pharmacologically relevant species
“The antibody bound to human and chimpanzee CD38, but did not bind to CD38 from the mouse, rat, rabbit, pig, or cynomolgus and rhesus monkey.”
✓ VerifiedFDA multi-discipline review, p. 35Source ↗
Surrogate molecule
No surrogate; the clinical antibody was tested in cynomolgus monkey; monkey-reactive surrogates were evaluated but differed in tissue cross-reactivity
“The pattern of tissue cross-reactivity of both ch38SB25 and chOKT10 surrogates in monkey tissues was significantly different from the pattern of tissue-cross-reactivity observed with isatuximab in human tissues”