“Thus, the toxicity of avelumab was evaluated in a GLP-compliant, 13-week toxicology study in cynomolgus monkeys.”
✓ VerifiedFDA multi-discipline review, p. 40Source ↗
Why that species
Similar binding affinity to monkey and human PD-L1 and comparable tissue cross-reactivity
“The cynomolgus monkey was, however, a pharmacologically relevant species for toxicity testing based on a similar avelumab binding affinity to cynomolgus monkey and human PD-L1 and the comparable cross-reactivity of avelumab across cynomolgus monkey and human tissues.”
✓ VerifiedFDA multi-discipline review, p. 40Source ↗
Surrogate molecule
No surrogate; avelumab itself binds mouse and cynomolgus PD-L1
“Avelumab shows similar binding affinity for human, mouse and cynomolgus PD-L1.”