No cross-reactive binding in any human or cynomolgus monkey tissue
“No cross-reactive binding of bimekizumab conjugated to fluorescein isothiocyanate was observed in any human or monkey tissue at any concentration tested”
✓ VerifiedFDA multi-discipline review, p. 206Source ↗
Modality-specific risk
Infections from exaggerated IL-17A/F pharmacology reducing muco-epidermal immunity
“Bimekizumab specifically inhibits IL-17A and IL-17F and as such muco-epidermal infections are considered to be related to exaggerated pharmacology, leading to decreased muco-epidermal immunity.”
✓ VerifiedFDA multi-discipline review, p. 208Source ↗
Anti-drug antibodies: animals
Not systematically evaluated; some ADA-positive monkeys in the 8-week adalimumab co-treatment study, with reduced exposure only in co-treated animals
“In the 8-week study with adalimumab, only co-treated animals displayed reduced bimekizumab exposure after repeated doses and select animals in 2 mg/kg/week and 20 mg/kg/week groups were positive for anti-bimekizumab antibodies.”
45% (116/257) of psoriasis patients developed ADA; ~16% of ADA-positive had neutralizing antibodies
“116/257 (45%) of BIMZELX-treated subjects (at the recommended dosage) developed anti-bimekizumab-bkzx antibodies (also referred to as ADA). Of the BIMZELX-treated subjects who developed ADA in these trials, approximately 16% had 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