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Journal Article
Research Support, U.S. Gov't, P.H.S.
An atlas of subgross pathology of the human breast with special reference to possible precancerous lesions.
Journal of the National Cancer Institute 1975 August
One hundred ninety-six whole human breasts were examined by a subgross sampling technique with histologic confirmation. The method permitted the enumeration and identification of essentially all the focal dysplastic, metaplastic, hyperplastic, anaplastic, and neoplastic lesions. Of the 196, 119 were suitable for complete quantitative morphologic analysis of the focal lesions by type. They consisted of 67 breasts obtained by autopsy, 29 cancerous breasts obtained by mastectomy, and 23 contralateral to those with cancer. All lesions, photographed subgrossly, were subsequently confirmed and correlated histologically. Morphologic evidence supported the hypothesis that most lesions traditionally grouped as mammary dysplasia or fibrocystic disease, including apocrine cysts, sclerosing adenosis, fibroadenomas, various forms of lobules (sclerotic, dilated, hypersecretory, hyperplastic, atypical, or anaplastic), ductal carcinoma in situ (DCIS), and lobular carcinoma in situ (LCIS), arose in terminal ductal-lobular units (TDLU) or in the lobules themselves. A probable exception was papilloma of ducts larger than terminal ones. Isolated foci of DCIS within the TDLU were seen in 40% of cancerous breasts, which indicated that the disease often was multifocal. Of the contralateral breasts, the 60% with clinical cancer contained such lesions, and data were in accord with the clinically known fact that women with previous breast cancer have a high rate of the disease in the remaining one. An atypical lobule (AL) of type A (ALA) had the following characteristics: a) It was more common in cancerous breasts or in those contralateral to cancer than in breasts not so identified; b) it had lobular morphology and was a terminal structure on the mammary tree; c) it tended to persist after the menopause, whereas normal lobules usually atrophied; d) it variable degrees of anaplasia forming an arbitrary continuum from normal lobules to ductal carcinoma in situ; and e) as ALA progressed to DCIS, the unfolded lobule resembled a duct which gave the false impression that DCIS was a ductal lesion. The morphologic evidence supported that hypothesis that the lesions herein called AL were derived from TDLU and were precancerous.
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