Ifosfamide induced dominant lethal mutations in spermatozoa of mice at dose
s of 200 and 300 mg/kg and in spermatids and spermatocytes at 600 mg/kg. Th
e highest dose also induced specific-locus mutations in post-spermatogonial
germ-cell stages of mice but not in spermatogonial stem cells. The nature
of the induced mutations suggests they are intergenic. The spermatogenic sp
ecificity of ifosfamide in mouse germ cells is similar to that of the struc
turally related cytostatic drugs cyclophosphamide and trofosfamide. Due to
the post-spermatogonial germ cell specificity of ifosfamide, the genetic ri
sk is limited to a few weeks after exposure.