No in vitro cytokine release from human PBMCs at up to 400 µg/well
“Furthermore, in an in vitro cytokine release assay, dostarlimab did not induce cytokine release at concentrations up to 400 µg/well.”
✓ VerifiedFDA multi-discipline review, p. 35Source ↗
Biodistribution & persistence
TCR: specific membrane binding to lymphocytes in many tissues and to peripheral blood monocytes
“Specific binding of dostarlimab was observed on plasma membrane elements of lymphocytes (including intravascular, perivascular, interstitial, and migrating lymphocytes) in a large number of tissues and to monocytes in peripheral blood.”
✓ VerifiedFDA multi-discipline review, p. 53Source ↗
Modality-specific risk
Immune-mediated adverse reactions from PD-1 checkpoint blockade
“In clinical trials, toxicities associated with dostarlimab were primarily immune‐mediated adverse reactions that are predicted by its mechanism of action.”
✓ VerifiedFDA multi-discipline review, p. 36Source ↗
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