Sirolimus var ikke mutagent i in vitro bakteriel omvendt mutationsbestemmelse, kromosomafvigelsesbestemmelse i en kinesisk hamsters ovariecelle, fremadrettet mutationsbestemmelse i muselymfecelle eller in vivo mikronuklear bestemmelse i mus.
Sirolimus was not mutagenic in the in vitro bacterial reverse mutation assays, the Chinese Hamster Ovary cell chromosomal aberration assay, the mouse lymphoma cell forward mutation assay, or the in vivo mouse micronucleus assay.