Negative in Ames, in vitro chromosomal aberration and in vivo mouse micronucleus assays
“There was no evidence of mutagenicity or clastogenicity for atrasentan in in vitro bacteria reverse mutation and chromosomal aberration assays, or in an in vivo mouse micronucleus study.”
Rat and rabbit EFD: teratogenic at exposures below the MRHD
“In animal reproduction studies, oral administration of atrasentan to pregnant rats and rabbits throughout organogenesis at doses that were below the maximum recommended human dose (MRHD) based on area under the curve (AUC) caused teratogenic effects in rats and rabbits”
Dog telemetry: minimal QTc effect up to 51 times clinical Cmax
“In conscious dogs implanted with telemetry transmitters, atrasentan (≥10 mg/kg) showed minimal effects on heart rate-corrected QT interval at doses up to 51 times the maximal concentration achieved at the MRHD.”
Not genotoxic overall: Ames negative; in vitro chromosome aberration positive without (not with) metabolic activation; rat micronucleus and comet negative