ADA in 3 monkeys in pivotal study; one at 25 mg/kg had repeated hypersensitivity-type infusion reactions
“Immunogenicity noted in 3 animals in the pivotal toxicity study (1 at 5 mg/kg, 2 at 25 mg/kg); 1 of the 25 mg/kg animals had repeated infusion reactions c/w hypersensitivity”
✓ VerifiedFDA pharmacology/toxicology review, p. 126Source ↗
Biodistribution & persistence
Human TCR binding only in spinal cord, brain and optic nerve; no binding in other tissues
“In human tissue, binding was observed in spinal cord, brain and optic nerve. No binding was seen to peripheral nerves, or any other human tissue examined.”
Lack of eosinophil recovery, parasitic infection risk, CNS toxicity from tissue binding, hypersensitivity
“Lack of recovery of eosinophils, increased risk of parasitic infections, nonspecific CNS toxicity due to potential tissue binding, hypersensitivity responses.”
✓ VerifiedFDA pharmacology/toxicology review, p. 125Source ↗
Anti-drug antibodies: animals
ADA in all nonclinical species; neutralizing, with reslizumab undetectable in ADA-positive animals
“There was evidence of ADA formation in all nonclinical species tested. Analysis of PK parameters in ADA-positive animals found that the antibodies were neutralizing, as reslizumab was not detected in the blood of these animals.”
✓ VerifiedFDA pharmacology/toxicology review, p. 95Source ↗
Anti-drug antibodies: patients
5.4% (53/983) in placebo-controlled studies; low titer, often transient; neutralizing not evaluated
“In placebo-controlled studies, a treatment-emergent anti-reslizumab antibody response developed in 53/983 (5.4%) of CINQAIR-treated patients (3 mg/kg).”
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