Immunotoxicity in one high-dose female: skin lesions, splenic lymphocytic atrophy, decreased NK cell activity and TDAR
“Immunotoxicity was observed in one high-dose female (#451) that developed skin lesions (treated with antibiotics), splenic lymphocytic atrophy, decreased NK cell activity, and decreased T-cell dependent antigen response (TDAR; see below).”
✓ VerifiedFDA pharmacology/toxicology review, p. 22Source ↗
Biodistribution & persistence
Placental transfer in cynomolgus and marmoset monkeys; fetal exposure about 2% of maternal serum concentration
“Serum analysis revealed that that secukinumab is transferred across the placenta during the pregnancy in cynomolgus monkeys and in marmosets, and that the fetuses are exposed to secukinumab at the level corresponding approximately 2% of the mean maternal serum concentration.”
Increased infection susceptibility from neutralizing IL-17A, a mediator of innate and adaptive immunity
“Secukinumab therapy is designed to neutralize critical mediators of innate and adaptive immunity. Thus it may carry the risk of an increased susceptibility to infection.”
✓ VerifiedFDA pharmacology/toxicology review, p. 31Source ↗
Anti-drug antibodies: animals
ADA in one monkey in the 13-week study; assay interference from high drug levels means ADA cannot be excluded
“Immunogenicity was observed in one animal in the 13 week repeat dose toxicity study. However, due to assay interference caused by high serum concentrations of secukinumab, occurrence of anti-secukinumab antibodies cannot be excluded.”
Less than 1% (25 of 6268) developed ADA; about 8% of those were neutralizing
“anti-secukinumab antibodies (referred as ADA) formation was less than 1% (25 of 6268 total of subjects treated with COSENTYX). Of the subjects treated with COSENTYX who developed ADA, approximately 8% developed neutralizing antibodies.”
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