Abstract
Hydrazine Sulphate (H.S.) even at low doses, equivalent to those administered with isoniazid in man, induced pulmonary tumours in the mouse, more actively in female BALB/c, CBA and C3Hb intact virgin mice. Endogenous ovarian stimulation (provoked by breeding, forced breeding and pseudo-pregnancy) increased the morphological malignancy and the carcinogenic index of these tumours in BALB/c and C3Hb mice. H.S. also induced mammary carcinomas in 38 % of forced bred BALB/c mice. Because of their extensive medical, industrial, agricultural and aero-spatial use, H. S. and hydrazine derivatives should be investigated. Several hydrazine derivatives are carcinogenic in mice, rats and hamsters.
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