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 ↗
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