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• W2059652803 abstract "This report describes the clinico-pathological features of myofibroblastic tumors of the breast in six patients. Four women and one man presented with a benign myofibroblastoma. The sixth patient was a woman with myofibrosarcoma. All myofibroblastomas were composed of a fascicular arrangement of spindle cells embedded in dense bundles of collagen. Tumors differed with respect to their proportion of neoplastic cells and collagenous stroma as well as cellular pleomorphism. Based on this variation, the tumors could be subclassified as classic, collagenized, epithelioid and cellular myofibroblastoma. Immunohistological staining confirmed myofibroblastic differentiation by strong expression of either desmin or smooth muscle actin with coexpression of vimentin. In addition, numerous cells reacted with antibodies to CD68. Proliferative activity was rather low in the myofibroblastoma with an average of 0-2 mitotic figures per 10 HPF. DNA cytometric analysis was performed in two cases and showed diploid stem lines with minor S-phase fractions (1% and 3%). In the myofibrosarcoma, cells contained pleomorphic nuclei with some giant cells and numerous mitotic figures (6-7/10 HPF) and had infiltrating margins that were apparent even grossly. Immunohistochemically, tumor cells strongly expressed vimentin, smooth muscle actin and fibronectin. Ultrastructurally, neoplastic cells met the criteria of myofibroblasts, i.e. contained abundant intermediate filaments and myofilament bundles with focal densities as well as fibronexus junctions. DNA cytometric analysis exhibited again a diploid stemline but marked proliferative activity was present as indicated by an S-phase fraction of 20%. In conclusion, in benign myofibroblastoma there may be some cellular pleomorphism but mitotic activity is always low. The malignant counterpart, myofibrosarcoma, is characterized by marked cellular pleomorphism, infiltrating margins and high mitotic rate." @default.
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• W2059652803 date "1999-01-01" @default.
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• W2059652803 title "Breast tumors with myofibroblastic differentiation: clinico-pathological observations in myofibroblastoma and myofibrosarcoma" @default.
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• W2059652803 doi "https://doi.org/10.1016/s0344-0338(99)80087-9" @default.
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