Anaphylactoid reaction in a monkey associated with high ADA; animal immunogenicity not considered predictive of clinical risk
“This anaphylactoid reaction was associated with the presence of high levels of ADA. As immunogenicity to a human protein in animals is not predictive for clinical immunogenicity, the finding is not considered indicative of a clinical risk.”
TCR: staining mainly of blood vessels (endothelium, smooth muscle, adventitia)
“In a tissue cross-reactivity study, eptinezumab staining was generally in blood vessels including endothelium, smooth muscle, and adventitia.”
✓ VerifiedFDA pharmacology/toxicology review, p. 44Source ↗
Modality-specific risk
Theoretical cardiovascular and pregnancy (pre-eclampsia) risks of blocking CGRP signalling
“specific theoretical risks associated with blockade of CGRP-dependent signalling (i.e. cardiovascular outcomes in patients with pre-existing myocardial infarction, cerebro-vascular accident, transient ischemic attack, angina, unstable and poorly controlled hypertension; use in pregnancy including those at risk of pre-eclampsia)”
One low-dose monkey died of an anaphylactoid reaction associated with high ADA
“One low-dose female exhibited an anaphylactoid-like reaction and died within approximately 30 minutes after eptinezumab administration on Day 71 (6th dose). This anaphylactoid reaction was associated with the presence of high levels of ADA.”
Study 1: ADA in 20.6% (92/447) of patients; 41.3% of these neutralizing
“In patients receiving VYEPTI 100 mg or 300 mg every 3 months, the incidence of anti-eptinezumab-jjmr antibody development in Study 1 (up to 56 weeks) was 20.6% (92/447), and 41.3% (38/92) of those patients developed anti-eptinezumab-jjmr 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