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References in periodicals archive ?
Isolated in situ carcinomas of the breast constitute 25-30% of all screen detected tumors in countries that practise routine screening.
A series of in situ carcinomas (ISCs) was also studied by separately assaying the benign adenomatous portion as well as the malignant portion to compare the frequency of LOH of this chromosomal region in the 2 stages of the evolving neoplasm.
In our series, patients with invasive and in situ carcinomas were treated similarly to other breast cancer patients in our comprehensive breast care center.
The invasive carcinomas and the majority of the in situ carcinomas identified in this study were small, non-massforming, noncalcifying lesions; hence, they were not detected on preoperative screening mammograms or on gross pathologic examination.
Distinguishing Between Invasive and In Situ Carcinomas
(5) Collagen IV and laminin have been used for distinguishing invasive carcinoma from in situ carcinoma. (6) Benign or in situ lesions should demonstrate positive staining for MEP markers, whereas invasive carcinomas should show a loss of MEP staining at the periphery of each glandular structure (Figure 2, A through F).
Cystic hypersecretory carcinoma can be associated with in situ carcinomas without luminal secretions and with micropapillary features.
The usefulness of MEC markers stems from the fact that in situ carcinomas are still contained within the ducts and lobules and, therefore, are surrounded by an MEC layer and basement membrane.
Invasive breast carcinoma constitutes 70% to 85% of the incidence; the remaining 15% to 30% are in situ carcinomas, 80% of which are ductal carcinoma in situ (DCIS).
(1-4) Although they are currently considered in situ carcinomas by the most recent World Health Organization classification, (5) the lack of myoepithelial cells in the periphery of the tumor is intriguing.
The most common use of myoepithelial markers is to establish the presence or absence of an invasive carcinoma (Figures 1 and 2), a practice that is based on the fundamental principle that in situ carcinomas and nonneoplastic epithelial proliferations (Figure 3), in contrast to invasive carcinomas, retain a peripheral layer of MECs.