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对７例呼吸系统小涎腺粘液表皮样癌的观察表明：（１）与大涎腺粘液表皮样癌相同，是由三种不同超微结构的细胞组成的。（２）肿瘤的生长类型、生长方式和细胞分化程度可做为判定其恶性程度的指标。本文７例粘液表皮样癌中６例为低度恶性，１例为高度恶性，（３）超微结构和免疫组织化学观察证明肌上皮在肿瘤的组织发生中起重要作用。
The observation of seven cases of small salivary mucoepidermoid carcinoma of the respiratory system showed that: (1) It is the same as the mucous epidermoid carcinoma of the salivary glands and consists of three different ultrastructure cells. (2) The growth type, growth pattern, and cell differentiation of the tumor can be used as indicators for determining the degree of malignancy. Of the 7 cases of mucoepidermoid carcinoma, 6 cases were of low grade malignancy and 1 case of high grade malignancy. (3) Ultrastructure and immunohistochemical observations demonstrated that myoepithelium plays an important role in the pathogenesis of tumor.