Negative Ames; not clastogenic in vitro or in rat chromosome aberration assay; positive rat micronucleus
“Mirdametinib was not clastogenic in an in vitro human lymphocyte chromosomal aberration assay or in an in vivo rat bone marrow chromosomal aberration assay. Mirdametinib was positive in the in vivo micronucleus assay in rats.”
Rat and rabbit dose-range EFD: embryofetal lethality at non-maternotoxic 0.64 and 0.3 mg/kg/day
“In the dose-range finding embryo-foetal development studies, embryofoetal lethality was observed from the non-maternotoxic dose levels of 0.64 and 0.3 mg/kg/day in rats and rabbits, respectively.”
Not genotoxic overall: Ames negative; in vitro chromosome aberration positive without (not with) metabolic activation; rat micronucleus and comet negative