ADA in 40% of treated monkeys in the 26-week study, with hypersensitivity reactions in some animals
“Primate anti-human antibodies (ADAs) were detected in toxicological studies in Cynomolgus monkeys, accompanied by hypersensitivity reactions in some animals. Anti-human antibodies against SelG1 were detected in 40% of all treated animals at least once throughout the observation period in a 26-week repeat-dose toxicity study.”
TCR: binding to platelets (blood, spleen) and blood vessels in most human and cynomolgus tissues
“Crizanlizumab binding was seen in platelets in the blood and spleen, and in blood vessels in the majority of tissues examined of both human and cynomolgus monkey.”
✓ VerifiedFDA multi-discipline review, p. 30Source ↗
Modality-specific risk
Fetal loss with placental infarcts (pharmacology or immunogenicity); vascular inflammation in monkeys
“The cause for the fetal losses in monkeys is unknown but may be related in part due to the development of anti-drug antibodies against crizanlizumab-tmca.”
✓ VerifiedFDA multi-discipline review, p. 31Source ↗
In vitro whole-blood cytokine release far below alemtuzumab/TGN1412 controls; no effects on monkey TDAR, lymphocyte subsets or serum cytokines; ADA in some monkeys