Mouse deaths and premature euthanasia, mainly at low IV dose, attributed to immunogenicity to the human protein
“The deaths and/or premature euthanasia of the remaining animals, primarily in the LD IV group, were attributed to immunogenicity based upon observed adverse clinical signs, although there were no histopathological findings.”
Monkey SC bioavailability ~66%; half-life 147-581 h (IV) and 206-424 h (SC)
“The SC bioavailability of garadacimab (6 mg/kg) was ~66% in monkeys. Mean estimated t1/2 values for garadacimab in the single-dose PK study with monkeys ranged from 147 to 581 h (IV) and 206 to 424 h (SC).”
Monkey: ADA in some animals; exposure maintained (possibly reduced) at high doses; no impact on toxicity assessment
“Anti-drug antibody (ADA) development in some of the test item-treated animals was considered not to have any impact on the overall toxicity assessment of CSL312 in this study, since -due to the high doses used- continued (although possibly reduced) exposure was seen in all of the animals.”
2.6% (1/39) ADA-positive over 6 months; no effect on PK, safety or clinical response
“In VANGUARD, 2.6% (1/39) of patients who received garadacimab-gxii tested positive for anti- garadacimab-antibodies during the 6-month treatment period. The development of ADA against garadacimab-gxii did not affect pharmacokinetics (PK), safety, or clinical response.”
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