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5 The distinction between smooth muscle cells and other cell types with muscle differentiation can be based on ultrastructural findings, such as the presence/absence of fibronexus.6, 7 A good concordance between immunohistochemistry and electron microscopy in recognizing myogenic differentiation in soft tissue pleomorphic sarcomas has been reported.6 Routinely, because electron microscopy is not available in most pathology departments, this distinction is based on morphology and immunophenotype.8, 9 The problem can arise when dealing with poorly differentiated sarcomas in which morphology is nondistinctive, a true leiomyosarcomatous morphology is no more evident, and myogenic differentiation is very scanty. This group encompasses poorly differentiated, high-grade LMS together with other high-grade sarcomas that have myogenic differentiation, http://www.selleck.cn/products/gsk126.html such as myosarcomas and undifferentiated pleomorphic sarcomas. Myofibroblasts were defined first on electron microscopy features. Morphology plus immunohistochemistry can discriminate well/moderately differentiated sarcomas and a part of poorly differentiated sarcomas but are not applicable with certainty http://www.selleckchem.com/products/BI-2536.html to all poorly differentiated lesions. This is the reason why all poorly differentiated sarcomas with only minimal expression of myogenic markers have been included together under the heading sarcoma with myogenic differentiation (SMD). The objective of the current study was to evaluate the natural history http://www.selleckchem.com/products/Cyclopamine.html and prognostic factors for LMS and SMD of nonuterine origin and identify differences and/or similarities that may help to distinguish them as different entities or as different phenotypes of the same disease. The histologic diagnoses of 349 consecutive patients who had an original diagnosis of LMS or SMD and underwent surgery with the intent to eradicate disease at the National Cancer Institute, Milan, Italy within a dedicated surgical unit between June 1994 and December 2010, were reviewed by an experienced sarcoma pathologist (P.C.). A standardized protocol was used for the review process. All available histologic material from each patient was reviewed. The ��LMS�� group included sarcomas with classic LMS morphology4 and strong/moderate immunocytochemical expression of at least 2 myogenic markers, including smooth muscle actin 1A4, caldesmon, calponin, and desmin in ��50% of neoplastic cells in the absence of myogenin. High-grade sarcomas without classic LMS morphology that expressed myogenic markers only focally and weakly in