ADA in 8.3%, 25% and 5.5% of monkeys in the 9-, 15- and 39-week studies
“Testing for development of anti-benralizumab antibodies was also completed and this was seen in 2 of 24 (8.3%), 9 of 36 (25%) and 2 of 36 (5.5%) of monkeys given benralizumab in the 9-, 15- and 39-week studies, respectively.”
Placental and/or milk transfer in monkeys: infants had detectable benralizumab
“In pregnant monkeys, there was evidence of placental and/or milk transfer as infants showed detectable benralizumab concentrations despite not being dosed directly.”
Eosinophil and basophil depletion via enhanced ADCC from afucosylated Fc
“The absence of fucose in the Fc domain of benralizumab results in higher affinity for FcγRIIIa receptors (approximately 6-fold compared to the fucosylated parental antibody) on immune effector cells, leading to apoptosis of eosinophils and basophils through enhanced antibody-dependent cell-mediated cytotoxicity (ADCC).”
✓ VerifiedFDA pharmacology/toxicology review, p. 38Source ↗
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