黏液表皮样癌8例临床及病理分析

【摘要】 目的 探讨黏液表皮样癌的临床、组织病理及鉴别诊断要点。方法 回顾性分析2018—2021年中国医学科学院、北京协和医学院皮肤病医院病理科会诊的8例黏液表皮样癌患者的临床、组织病理、免疫组化、治疗及预后。结果 8例患者中，男5例，女3例，发病年龄19 ~ 67岁，皮损位于唇部黏膜5例、面颊2例、鼻部1例。肿瘤均位于真皮及皮下组织，部分与表皮相连，不同比例的黏液细胞、表皮样细胞、中间细胞排列成巢状、团块状，形成实性或囊性结构，伴有不同程度的导管形成及黏液湖；所有表皮样细胞、中间细胞均表达细胞角蛋白AE1/AE3、CK5/6、P63、癌胚抗原及上皮膜抗原。按照目前国内分级标准，8例中1例为中间级别，其余为低级别。系统检查均未见异常。均接受手术切除治疗，经过12 ~ 36个月随访，无复发及远处转移。结论 黏液表皮样癌临床表现无特征性，诊断主要依靠组织病理学形态；阿辛蓝染色显示黏液细胞胞质内的黏液具有特征性。

Clinical and pathological analysis of 8 cases of mucoepidermoid carcinoma

【Abstract】 Objective To investigate clinical and histopathological features and differential diagnostic considerations of mucoepidermoid carcinoma （MEC）. Methods A retrospective study was carried out on clinical manifestations, histopathological and immunohistochemical features, treatment and prognosis of 8 patients with MEC, who were collected from Department of Pathology, Hospital of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College during 2018 - 2021. Results Among the 8 patients, 5 were males and 3 were females, and their age at onset ranged from 19 to 67 years. Skin lesions were located on the lip mucosa in 5 cases, on the cheek in 2 cases, and on the nose in 1 case. Tumors were all located in the dermis and subcutaneous tissue, parts of which were connected to the epidermis; different proportions of mucous cells, epidermoid cells and intermediate cells were arranged in nests or clumps, and formed solid or cystic structures accompanied by varying degrees of formation of ducts and mucus lakes; all epidermoid cells and intermediate cells expressed cytokeratins AE1/AE3, CK5/6, P63, carcinoembryonic antigen and epithelial membrane antigen. According to the current Chinese grading system, 1 of the 8 patients was diagnosed with intermediate-grade MEC, and others were diagnosed with low-grade MEC. No abnormalities were found by systemic examination. All patients received surgical resections. After the follow-up of 12 - 36 months, no recurrence or distant metastasis was observed. Conclusion MEC presents no characteristic clinical manifestations, its diagnosis mainly depends on histopathological features, and mucus in the cytoplasm of mucous cells as shown by alcian blue staining is specific for MEC.