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”
Cynomolgus monkey (non-binding species; off-target toxicity study only)
“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 ↗
Species: DART
Not conducted (no pharmacologically relevant species); weight of evidence from CD38 literature
“Due to the lack of an appropriate pharmacologically relevant animal species for a study assessing the effects of isatuximab on embryo-fetal development, the evaluation of the reproductive and developmental toxicity of isatuximab is based on a weight of evidence (WOE) approach using literature on the involvement of CD38 in reproduction and development.”
✓ VerifiedFDA multi-discipline review, p. 37Source ↗
Species: carcinogenicity
Not conducted
“No carcinogenicity studies were performed with isatuximab.”
✓ VerifiedFDA multi-discipline review, p. 58Source ↗
Surrogate used in
No surrogate used; monkey-reactive surrogates ch38SB25 and chOKT10 evaluated but tissue cross-reactivity differed from isatuximab
“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”