ADA in 5/7 monkeys at 5 mg/kg and 3/9 at 16 mg/kg; none at the high dose
“In immunogenicity testing, 5 of 7 animals in the 5 mg/kg group tested positive for anti-ramucirumab antibodies, 3 of 9 animals in the 16 mg/kg group tested positive for anti-ramucirumab antibodies, and none tested positive”
✓ VerifiedFDA pharmacology/toxicology review, p. 75Source ↗
Biodistribution & persistence
TCR: vascular endothelium in human and monkey tissues, consistent with VEGFR-2 distribution
“Tissue cross-reactivity was observed in vascular endothelium in both human and Cynomolgus monkey tissues, consistently with the distribution of the molecular target of ramucirumab, VEGFR-2.”
Anti-angiogenic toxicity, notably moderate to severe glomerulonephritis in monkeys at ≥16 mg/kg
“Ramucirumab induced renal toxicity in the 39-week study. Moderate to severe glomerulonephritis occurred in male and female monkeys at ramucirumab doses ≥ 16 mg/kg.”
✓ VerifiedFDA pharmacology/toxicology review, p. 19Source ↗
Anti-drug antibodies: animals
ADA in monkeys at 5 and 16 mg/kg, not at 50 mg/kg; unlikely to have significantly affected exposure
“Anti-ramucirumab antibodies were detected in animals treated with 5 and 16 mg/kg but not at 50 mg/kg. Given the more than dose proportional exposure to ramucirumab, it is unlikely that the anti-drug antibodies had a significant effect on ramucirumab exposure in this study.”
✓ VerifiedFDA pharmacology/toxicology review, p. 86Source ↗
Anti-drug antibodies: patients
3% (86/2890) treatment-emergent anti-ramucirumab antibodies; neutralizing in 14 of 86
“In clinical trials, 86/2890 (3%) of CYRAMZA-treated patients tested positive for treatment-emergent anti-ramucirumab antibodies by an enzyme-linked immunosorbent assay (ELISA). Neutralizing antibodies were detected in 14 of the 86 patients”
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