“Genetic toxicology studies were not conducted or needed per ICH S6 guidance.”
✓ VerifiedFDA pharmacology/toxicology review, p. 7Source ↗
Carcinogenicity
Not conducted; weight-of-evidence suggests low risk, but reduced immune surveillance means increased tumor susceptibility cannot be ruled out
“Rodent carcinogenicity studies have not been conducted with siltuximab. Evidence from studies conducted with siltuximab and other IL-6 inhibitors suggest that the potential for siltuximab to cause carcinogenicity is low.”
Monkey EFD and ePPND (humanized analog): placental transfer, reduced globulin in dams and offspring; mouse surrogate fertility studies negative
“Siltuximab crossed the placenta and resulted in reduced globulin levels in pregnant animals and in the offspring; this may be secondary to a decreased production of immunoglobulin as expected from the pharmacology of this product.”
✓ VerifiedFDA pharmacology/toxicology review, p. 8Source ↗
Safety pharmacology
Incorporated into 3- and 6-month monkey studies (ECG, BP, respiration, CNS observations); no siltuximab-related adverse effects
“No siltuximab treatment–related adverse effects on safety pharmacology parameters were observed in the 3 and 6 months toxicology studies.”