Abstract
Ductal carcinoma in situ is the last step preceding invasive ductal carcinoma in breast carcinogenesis. We investigated the role of myoepithelial cells and epithelium characteristics as predictors of the risk of stromal invasion. We selected 236 cases with initial diagnosis of DCIS followed by surgical ressection distributed in groups 1 (without invasion) and 2 (with invasive carcinoma). The risk of stromal invasion after a DCIS diagnosis in biopsy was associated to triple-negative profile and loss of CD10 expression by myoepithelial cells, and inversely associated with CK5/6 expression by neoplastic cells and high expression of Smooth Muscle Myosin Heavy Chain (SMMHC) by myoepithelial cells. A combination of characteristics of epithelial and myoepithelial cells in DCIS in biopsy specimens is related to the risk of stromal invasion.
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