Absence of carcinogenic effects of estradiol mustard (NSC-112259) in rats

Estradiol mustard (NSC 112259) was subcutaneously injected to female Sprague-Dawley-rats in weekly doses of 10 and 20 mg/kg up to a total dose (Dmax) of 500 or 760 mg/kg respectively. Treatments reduced significantly the mean survival time. No carcinogenic properties were observed. Most of the estrogen mustard treated animals died from ovarian abscesses or peritonitis following pyometras. Toxic injuries were attributed to the chronical estrogenic stimulus.