Effect of epidermal chalones on induction and growth of tumors of the cervicovaginal epithelium of mice

Tumors of the cervicovaginal epithelium were induced in BALB/c female mice with local application of dimethylbenzanthra cene. In the course of inducing tumors or after their appearance the mice were treated intravaginally with 55-81% ethanolic extract of the rat skin or liver (control) containing 1% chalones. The skin extract rather than liver one delays slightly the growth and incidence of cervical and vaginal tumours, and increases the survival of animals.