Metastatic myoepithelioma of the breast.
ABSTRACT Myoepitheliomas are typically benign tumours arising from exocrine glands. There have only been five reports of malignant myoepitheliomas from breast origin previously published in the English literature. This report describes a patient with myoepithelioma arising in the breast which later metastasized despite the primary tumour having benign histological features. Impaired immune function due to end-stage renal failure and haemodialysis may have contributed to the malignant potential of her tumour. The literature regarding myoepithelial tumours is reviewed. All breast myoepitheliomas should be managed as potentially malignant tumours with appropriate surgical clearance and staging.
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ABSTRACT: Increased incidence of cancer at various sites is observed in patients with end-stage renal disease (ESRD). In particular, lymphomas and carcinomas of the kidney, prostate, liver and uterus show an enhanced prevalence in these subjects compared with the general population. A multitude of factors directly or indirectly associated with the renal disease and the treatment regimens may contribute to the increased tumor formation in these patients. Impaired function of the immune system and of DNA repair mechanisms as well as reduced antioxidant defense, accumulation of carcinogenic compounds partly due to reduced renal elimination as well as chronic infections and inflammations are found more frequently in patients with ESRD compared with the general population and may act in concert to accelerate malignant transformation and tumor formation.American Journal of Nephrology 02/1998; 18(2):89-95. · 2.62 Impact Factor
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ABSTRACT: Myoepithelioma of the breast is rare. It is usually benign but may be locally aggressive. Its clinical behavior is unknown, but if it follows the course of similar tumors of the salivary glands, the likelihood of systemic spread is very low. Mammographic findings are nonspecific, and ultimate identification is based on ultrastructural criteria.Canadian Association of Radiologists Journal 01/1991; 41(6):387-8. · 0.43 Impact Factor
Article: Myoepithelioma of soft tissue.[show abstract] [hide abstract]
ABSTRACT: A myoepithelioma occurred in the subcutaneous tissue of the right shoulder of a 28-year-old man. The well-demarcated nodular tumor (3. 0 x 2.8 cm) was located in the subcutaneous tissue with no adhesion to the deltoid muscle. The tumor was composed of a fascicular proliferation of spindle cells with variable amounts of stroma and showed areas of sheets of epithelioid cells. In most areas, the tumor cells had uniform nuclei, but pleomorphic epithelioid cells were focally present. Mitotic activity was three per 10 high-power fields. No ductular structure was found throughout the tumor. Immunohistochemical and ultrastructural studies confirmed the myoepithelial origin of the tumor cells. The occurrence of myoepithelioma in the subcutaneous tissue has been rarely reported. Even though the tumor showed no aggressive behavior on the 2-year follow-up, it is still too early to comment definitely on the behav- ior of myoepithelioma of the subcutaneous tissue. This case provides further information about soft tissue myoepithelioma.Pathology International 07/1999; 49(6):571-6. · 1.72 Impact Factor