No adverse consequences of ADAs in rats and monkeys; immune complex disease in a few rabbits
“There were no adverse consequences of ADAs in rats and monkeys. In the rabbit, adverse consequences of the immune response to romosozumab (immune complex disease) occurred in a few animals.”
TCR: binding to osteocytes in human, monkey and rabbit bone (not rat) and to monkey aorta/pulmonary artery
“A tissue cross-reactivity immunohistochemistry study showed binding of AMG785 to osteocytes in human, cynomolgus monkey, and rabbit, but not rat bone. Binding was also observed in aorta or pulmonary artery in a monkey.”
✓ VerifiedFDA multi-discipline review, p. 600Source ↗
Modality-specific risk
Clinical cardiovascular signal without nonclinical support; Wnt-driven osteosarcoma risk; hypocalcemia; skeletal developmental effects
“However, there were no adverse findings from the nonclinical program that lend support to the cardiovascular findings observed in the clinical trials.”
✓ VerifiedFDA multi-discipline review, p. 233Source ↗
Anti-drug antibodies: animals
Immunogenic in rats and monkeys; ADA-positive animals with reduced exposure removed from analyses; no adverse ADA consequences
“To ensure robust assessment of the toxicity of romosozumab in longer term studies, rats and monkeys positive for binding ADAs with high S/N and reduced serum romosozumab concentration and/or presence of neutralizing antibodies were removed from study and data analyses. There were no adverse consequences of ADAs in rats and monkeys.”
18.1% of 5914 patients developed ADA; 4.7% of these neutralizing
“Among 5914 subjects treated with EVENITY, 18.1% developed antibodies to romosozumab-aqqg. Of the subjects who developed antibodies to romosozumab-aqqg, 4.7% had antibodies that were classified as neutralizing using an in vitro biological assay.”
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