Surrogate anti-mouse CTLA-4 antibody in subcutaneous syngeneic mouse tumour models, alone and with anti-mouse PD-L1
“A surrogate tremelimumab anti‐CTLA‐4 antibody prolonged survival in multiple subcutaneous mouse tumor models when administered alone and demonstrated increased response rates when administered in combination with an anti‐mouse PD‐L1 antibody.”
✓ VerifiedFDA multi-discipline review, p. 32Source ↗
Why that model
Tremelimumab binds human and cynomolgus CTLA-4 but not mouse, rat, hamster or rabbit T cells
“Tremelimumab also bound CTLA‐4 expressed on human and cynomolgus T cells stimulated to express CTLA‐4, but did not bind stimulated mouse, rat, hamster, or rabbit T cells;”
✓ VerifiedFDA multi-discipline review, p. 31Source ↗
Reviewer's view of the efficacy data
EMA: no proof of principle in the indicated tumour type; relevance to uHCC not provided
“A proof of principle specific for the tumour type included in the indication was not demonstrated. Thus, the relevance for the current proposed indication, uHCC, was not provided.”