Negative in Ames, in vitro TK6 micronucleus and in vivo mouse micronucleus assays
“Umbralisib was not mutagenic in a bacterial mutagenicity (Ames) assay. Umbralisib was not clastogenic in an in vitro micronucleus assay using human (TK6) lymphoblast cells or in an in vivo micronucleus assay in mice at doses up to 1000 mg/kg.”
hERG IC50 above 100 µM, the highest concentration tested
“An in vitro hERG channel inhibition study (Study # CYP0358-R10) with hERG-expressing cells incubated with umbralisib at concentrations up 100 M showed that the test article had an IC50 greater than the highest dose tested.”
✓ VerifiedFDA multi-discipline review, p. 34Source ↗
Not genotoxic overall: Ames negative; in vitro chromosome aberration positive without (not with) metabolic activation; rat micronucleus and comet negative