No cytokine release from human PBMCs up to 250 µg/mL; minimal Fcγ receptor binding, no ADCC up to 10 µg/mL
“Atezolizumab showed minimal binding to human Fcγ receptors and did not stimulate cytokine release from human PBMCs at concentrations up to 250 µg/mL or ADCC activity at concentrations up to 10 µg/mL.”
✓ VerifiedFDA pharmacology/toxicology review, p. 54Source ↗
Biodistribution & persistence
Human TCR staining in placenta (syncytiotrophoblasts), lymph node, tonsil and thymus
“staining was detected in the placenta, lymph node, tonsil, and thymus. Frequent, moderate, apical cytoplasmic and membranous staining was observed in syncytiotrophoblasts of the placenta.”
Immune-mediated tissue damage and multi-organ inflammation from PD-L1 blockade; irregular menstruation
“Toxicological effects of atezolizumab administration in animals were limited to irregular menstruation in female monkeys and immune-mediated effects, including tissue damage and multi-organ inflammation.”
✓ VerifiedFDA pharmacology/toxicology review, p. 14Source ↗
Anti-drug antibodies: animals
ATA in 50/56 treated monkeys (and 7/16 controls); mean exposure maintained during dosing
“ATAs were detected in 50 out of 56 monkeys receiving test article and 7 out of 16 animals in the vehicle control group. Although ATAs were present in the majority of treated animals, mean treatment exposure was maintained during the dosing period.”
✓ VerifiedFDA pharmacology/toxicology review, p. 37Source ↗
Anti-drug antibodies: patients
13% to 36% developed ADA in the first year across 9 studies
“During the first year of treatment with TECENTRIQ across 9 clinical studies, 13% to 36% of patients developed ADA to atezolizumab.”
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