Transient cytokine increases (TNF, IL-6, IL-10, IFN-gamma) in chimpanzees; slight IL-6/IL-12 rise with surrogate in mice; anaphylaxis on intermittent surrogate dosing
“At both doses evaluated, slight increases (<3.5-fold) in IL-6 and IL-12 levels were evident, consistent with the release of cytokines seen following treatment of chimps with teplizumab.”
✓ VerifiedFDA pharmacology/toxicology review, p. 57Source ↗
Biodistribution & persistence
Human TCR: staining restricted to T-cell regions of spleen, lymph nodes, MALT and thymus; no B-region staining
“Staining of lymphoid cells in B regions or non-T regions of lymphoid tissues was not observed.”
✓ VerifiedFDA pharmacology/toxicology review, p. 55Source ↗
“Increases in cytokines were also noted, indicating that cytokine release syndrome (CRS) may occur.”
✓ VerifiedFDA pharmacology/toxicology review, p. 8Source ↗
Anti-drug antibodies: animals
Surrogate exposure lost in mouse DART studies, partly attributed to ADA; ADA not measured in pivotal studies
“Exposure was not maintained throughout the reproduction toxicity studies with Q3D SC dosing with the surrogate at low and/or mid doses. This has been partly attributed to ADA occurrence however the presence of ADA was not investigated in any pivotal study.”
ADA in 50-94% after first course across 4 studies; almost 100% after a second course
“Based on this evaluation, teplizumab is immunogenic with the overall ADA incidence varying between 50-94% as observed during the first course across the various treatment regimens and across the 4 studies. ADA incidence increased to almost 100%, when a second course of treatment was administered.”
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