Classification of Premalignant and Malignant Lesions Developing in the Rat Mammary Gland After Injection of Sexually Immature Rats with 1-Methyl-1-nitrosourea

Abstract
Premalignant and malignant stages of mammary carcinogenesis can be rapidly induced by injecting female rats i.p. with 1-methyl-1-nitrosourea (MNU)3at 21 days of age. In this paper, the...