No binding to rat, mouse or rabbit CTLA-4; binds cynomolgus CTLA-4
“Ipilimumab did not show cross-reactivity with or binding to CTLA-4 from rats, mice or rabbits, but showed specific binding to cynomolgus monkey recombinant CTLA-4 and activated T-cells”
EMA: relevance of transgenic and homologous mouse tumour studies limited, as antibody given at time of tumour inoculation
“For the current application the relevance of this study, and other cited anti-tumour studies using homologous mouse tumour models is limited because in all these studies the (blocking) CTLA-4 antibody was administered at the time or shortly after tumour inoculation”