Heterogeneity for stem cell-related markers according to tumor subtype and histologic stage in breast cancer.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
So Yeon ParkKornelia Polyak

Abstract

To evaluate the expression of stem cell-related markers at the cellular level in human breast tumors of different subtypes and histologic stage. We performed immunohistochemical analyses of 12 proteins [CD44, CD24, ALDH1, vimentin, osteonectin, EPCR, caveolin 1, connexin 43, cytokeratin 18 (CK18), MUC1, claudin 7, and GATA3] selected based on their differential expression in breast cancer cells with more differentiated and stem cell-like characteristics in 47 cases of invasive ductal carcinoma (IDC) only, 135 cases of IDC with ductal carcinoma in situ (DCIS), 35 cases of DCIS with microinvasion, and 58 cases of pure DCIS. We also analyzed 73 IDCs with adjacent DCIS to determine the differences in the expression of markers by histology within individual tumors. CD44+/CD24- and CD24-/CD24+ cells were detected using double immunohistochemistry. CD44 and EPCR expression was different among the four histologic groups and was lower in invasive compared with in situ tumors, especially in luminal A subtype. The expression of vimentin, osteonectin, connexin 43, ALDH1, CK18, GATA3, and MUC1 differed by tumor subtype in some histologic groups. ALDH1-positive cells were more frequent in basal-like and HER2+ than in luminal tumors. CD44+/CD...Continue Reading

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