In vitro ADCC with nude rat effector cells ~22% vs 55% with human NK cells, underpredicting human activity
“Naxitamab induced approximately 22% ADCC in human LAN-1/rat splenocyte co-cultures whereas there was 55% ADCC against the same cell line in the presence of human NK cells, indicating that the rat/rat and rat/human systems underpredicted the activity of the human/human system.”
✓ VerifiedFDA multi-discipline review, p. 41Source ↗
Biodistribution & persistence
TCR: on-target binding to peripheral nerve, cerebellum, spinal cord, frontal lobe and pons
“FDA agrees that tissue cross reactivity studies showed binding to peripheral nerve, cerebellum, spinal cord, frontal lobe, and pons.”
✓ VerifiedFDA multi-discipline review, p. 56Source ↗
Modality-specific risk
Neuropathic pain from binding GD2 on peripheral nerve fibers and myelin with immune-mediated cytotoxicity
“Non-clinical studies suggest that naxitamab-gqgk-induced neuropathic pain is mediated by binding of the antibody to the GD2 antigen located on the surface of peripheral nerve fibers and myelin and subsequent induction of immune-mediated cytotoxic activity.”
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