MC38 syngeneic mouse colon tumor model with anti-mouse PD-1 surrogate RMP1-14; dostarlimab tested in vitro only
“Due to lack of cross‐reactivity between dostarlimab and mouse PD‐1, a surrogate anti‐mouse PD‐1 antibody (RMP1‐14) was used to assess the potential for PD‐1 inhibition to suppress tumor growth in an MC38 syngeneic mouse colon tumor model.”
✓ VerifiedFDA multi-discipline review, p. 38Source ↗
Why that model
Dostarlimab does not bind mouse PD-1, so a surrogate was needed for mouse tumor models
“Because dostarlimab did not bind to mouse PD‐1, the Applicant developed a mouse surrogate anti‐PD‐1 antibody (RMP1‐14) to investigate the effects of PD‐1 pathway inhibition on tumor growth.”
✓ VerifiedFDA multi-discipline review, p. 35Source ↗
Reviewer's view of the efficacy data
EMA: in vitro and surrogate in vivo proof of concept considered established
“From a non-clinical point of view, exposure-response relationship and the posology in patients appear to be justified. In vitro and in vivo proof of concept is considered established.”