[An immunoelectron microscopic study of the myoepithelial cells in salivary gland pleomorphic adenoma].

In the present study, the neoplastic myoepithelial cells in five pleomorphic adenomas of parotid gland were labeled with actin, myosin, S-100 protein, glial fibrillary acidic protein (GFAP) and vimentin. We have found that the neoplastic myoepithelial cells have many different morphologic features, they are the principal proliferating cells in the tumors. In the myxoid region, part of the neoplastic myoepithelial cells have early chondroid differentiation, this shows that the neoplastic myoepithelial cells take the important role in the histogenesis of the tumors.