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 ↗
Anti-drug antibodies: animals
Anti-benralizumab antibodies in 8.3%, 25% and 5.5% of monkeys in 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.”
ADA 13% in adults and adolescents (12-17) with asthma over 48-56 weeks; 12% neutralizing
“In adult and pediatric patients aged 12 to 17 years with asthma, the incidence of ADA to benralizumab in patients treated with FASENRA at the recommended dosing regimen during the 48 to 56-week treatment period was 13%. A total of 12% of patients treated with FASENRA 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