Female C3H/He mice carrying the mammary tumor virus (MTV) were monitor
ed for mammary tumor incidence and latent periods while subjected to a
daily intraperitoneal (i.p.) injection of placebo or alprazolam (1 mg
/kg per day). Although all of the mice were potential candidates for M
TV-induced breast cancer, those injected with alprazolam were partiall
y protected against adverse effects of stress induced by the daily adm
inistration of placebo.