Collagen of breast with benign dysplasia.

Benign dysplasia is a pathological process in the female breast associated with hypertrophy of interlobular and periductal connective tissue. It leads to disappearance of the lobular structure of this organ. It was found that the mammary tumours contain more collagen in comparison to the normal breast. In the normal breast collagen type I and type III constitute 70% and 25% of the total collagen content, respectively. The investigated tumors contain mainly a complex of collagen type I and type III which cannot be dissociated by the methods used for collagen preparation.