Negative in Ames, in vitro chromosomal aberration and in vivo rat micronucleus assays
“There was no evidence of mutagenicity or clastogenicity for aprocitentan in a standard battery of tests that included in vitro bacterial reverse mutation and chromosomal aberration assays, and an in vivo rat micronucleus study.”
Not conducted with aprocitentan; assessment relied on macitentan carcinogenicity studies
“The carcinogenicity assessment of aprocitentan was based on carcinogenicity studies conducted with another ERA, macitentan, for which its major metabolite is aprocitentan. No carcinogenicity studies were conducted with aprocitentan alone.”
Macitentan rat and rabbit EFD: teratogenic at all doses, no NOAEL; risk extrapolated to aprocitentan
“In embryo-fetal developmental (EFD) toxicity studies, treatment with macitentan (for which aprocitentan is a major metabolite) in pregnant rats and rabbits revealed teratogenicity and developmental toxicity at all doses tested, and therefore a no observed adverse effect level (NOAEL) for embryo fetal toxicity in the rat and rabbits could not be established.”
Not genotoxic overall: Ames negative; in vitro chromosome aberration positive without (not with) metabolic activation; rat micronucleus and comet negative