Rats: increased lymphocytes, neutrophils and NK cells; anti-drug antibodies affected exposure
“Increases in lymphocytes, neutrophils, and NK cells were also noted in rats. The rats did appear to develop an anti-drug antibody response which affected the pharmacokinetics of dinutuximab, particularly at the lowest dose level.”
✓ VerifiedFDA pharmacology/toxicology review, p. 2Source ↗
Biodistribution & persistence
Human TCR: membrane binding in kidney, GI, spleen, GALT, ovary, neurons and brain
“Conclusion: Membrane/membrane granules of kidney, GI, spleen, GALT, ovary, neurons, cerebrum, and brain were identified as ch14.18-target tissues in humans.”
✓ VerifiedFDA pharmacology/toxicology review, p. 50Source ↗
Modality-specific risk
Neuropathic pain and neuropathy from GD2 binding on peripheral nerves with complement- and ADCC-mediated damage
“Together these data suggest that the clinically reported pain response following administration of dinutuximab is a pharmacologic consequence of dinutuximab binding to peripheral nerves and causing damage through CDC and ADCC.”
✓ VerifiedFDA pharmacology/toxicology review, p. 11Source ↗
Anti-drug antibodies: animals
Rat: probable ADA response at 5 mg/kg/day with rapid clearance of ch14.18
“In the rat, rapid elimination of ch14.18 after the final dose indicates a potential anti-drug antibody response which was observed only at 5 mg/kg/day.”
ADA in 86/418 (20.6%) patients with GM-CSF, IL-2 and RA; 45 (52.3%) of these neutralizing
“Among the 418 patients who were treated with Unituxin in combination with GM-CSF, IL-2, and RA in Study 2, Study 3 and Study DIV-NB-201, 86 patients (20.6%) tested positive for anti-dinutuximab antibodies (ADA). Of the 86 ADA positive patients, 45 (52.3%) tested positive for neutralizing antibodies.”
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