Temsirolimus var ikke genotoksisk i en række in vitro analyser (bakteriel omvendt mutation i Salmonella typhimurium og Escherichia coli, fremadrettet mutation i lymphomceller fra mus og kromosomfejl i kinesiske hamsterovarieceller) og in vivo (musemikronukleus).
Temsirolimus was not genotoxic in a battery of in vitro (bacterial reverse mutation in Salmonella typhimurium and Escherichia coli, forward mutation in mouse lymphoma cells, and chromosome aberrations in Chinese hamster ovary cells) and in vivo (mouse micronucleus) assays.