PMID: 8951485Nov 1, 1996Paper

Mammary fibroadenoma and some phyllodes tumour stroma are composed of CD34+ fibroblasts and factor XIIIa+ dendrophages

Histopathology
J S Silverman, A Tamsen

Abstract

Fibroadenomas and mammary phyllodes tumour arise by proliferation of mammary stroma and epithelial elements. However, it is the stromal element that determines the biology of these biphasic tumours. Normal mammary stroma, like most collagenous connective tissue, contains resident populations of CD34+ dendritic interstitial cells and scattered factor XIIIa+ collagen-associated dendrophages. Actin+myofibroblasts are usually absent from mammary stroma in non-disease states. To determine whether CD34+ and factor XIIIa+ cells proliferate in fibroadenomas and phyllodes tumours, and to study myofibroblastic differentiation in these lesions, we examined 19 fibroadenomas in 14 patients along with five low grade and two high grade phyllodes tumours. We employed antibodies against the human progenitor cell antigen CD34, coagulation factor XIIIa and HHF-35 actin. In three fibroadenomas and two phyllodes tumours, we used Ki-67 antigen to study cell proliferation and oestrogen and progesterone receptors to study possible hormonal influence on stromal cells. In all fibroadenomas, CD34 strongly stained interlobular, pericanalicular and intracanalicular fibroblasts with collagenous and/or myxoid features. Four low grade phyllodes tumours also h...Continue Reading

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