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Intraepithelial lesions (IELs) are local morphological abnormalities of the ducts and lobules of the mammary gland that increase the risk of cancer. Programs of early detection of breast cancer have improved the identification of IELs. In canines they have been proposed as a comparative model with human IELs. Galectin-3 is involved with cancer progression in women and bitches but its role in the biological behavior of neoplasias is contradictory depending on the source cell. The aim of this study was to characterize by immunohistochemistry the expression of galectin-3 in 19 mammary glands (MG) from 6 canines without clinical signs of tumor, containing 50 types of IELs and seven invasive carcinomas, taking into account the percentage of positive cells and the intensity of color immunoreaction. There wasn’t any immunostaining for galectin-3 in the adenosis, in the usual ductal hyperplasias, in the atypical lobular hyperplasia, in the columnar cell lesions, in the complex carcinomas or in the complex hyperplasias. A papilloma/adenoma with acinar hyperplasia had multifocal staining in 11-50% of the cells with moderate intensity. Two in situ lobular carcinomas (ISLC) (one of nuclear intermediate grade and the other of high nuclear grade) had 10% staining cells, but the intensity was moderate in one of them and low in the other. Findings suggest that the role of galectin-3 is unimportant in the initiation of IELs, but also that it is a protein of interest in the progression of the lesions and that it possibly acts in the biological behavior of the disease.

revista de la facultad de medicina veterinaria y de zootecnia/revista de medicina veterinaria y zootecnia

Caracterización de la expresión de galectina-3 mediante inmunohistoquímica en lesiones intraepiteliales de glándula mamaria de perras sin evidencia de tumor