Negative in Ames, in vitro human lymphocyte chromosomal aberration and mouse micronucleus assays
“Lonafarnib was not mutagenic or clastogenic in the Ames test, the in vitro chromosomal aberration test using human whole blood lymphocytes, or the in vivo mouse micronucleus assay.”
Rat EFD: post-implantation loss at ~human exposure; rabbit EFD: skeletal malformations below human exposure
“In pregnant rats, post-implantation loss (resorptions) was seen at plasma drug exposures approximately equal to that achieved in humans. In pregnant rabbits, skeletal malformations were seen at plasma drug exposures lower than human exposures.”
Not genotoxic overall: Ames negative; in vitro chromosome aberration positive without (not with) metabolic activation; rat micronucleus and comet negative