Decreased plasma drug levels after repeat dosing attributed to ADA formation
“The sponsor attributed the decreases in plasma drug levels following repeat dosing to ADA formation (no individual animal ADA data were provided).”
✓ VerifiedFDA pharmacology/toxicology review, p. 60Source ↗
Biodistribution & persistence
TCR: staining of neurons and innervated tissues in human, monkey and rat, plus unexpected kidney tubular epithelium binding
“A tissue cross-reactivity study assessing galcanezumab binding positively stained select human, monkey, and rat tissues that were consistent with the association of CGRP with neurons and innervated tissues; however, specific binding was also observed in tissues not expected to express CGRP (i.e., tubular epithelium of the kidney).”
✓ VerifiedFDA pharmacology/toxicology review, p. 11Source ↗
Modality-specific risk
Cardiovascular risk of long-term CGRP antagonism (loss of vasodilation), especially with cardiovascular risk factors
“Because of the potent vasodilatory properties of CGRP, concerns were raised regarding long-term antagonism of the CGRP in humans, particularly in patients with cardiovascular risk factors.”
✓ VerifiedFDA pharmacology/toxicology review, p. 5Source ↗
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