This paper presented the clinicopathologic features of 83 cases of malignant pleomorphic adenomas(MPA) of the salivary glands.The average age of the patients was 53 years old.The ratio from male to female was 1.24 to 1.Thirty nine tumors located in parotid glands,twenty in submandibular glands and seventeen in palate.Histopathologically,the malignant component of 76 tumors was identified as carcinoma and 7 tumours as carcinosarcoma both in various types.The statistic analysis showed the factors which influenced the prognosis(P>0.05) included 1. location,2. histologic subtype of malignant component,3.differentiation grade,4.infiltration status,and 5.with or without lymph node metastasis in the initial operation.The prognosis of MPA was more ominous than that of/the conventional types of carcinoma,with only 52.7% of year survival rate.The authors concluded that the pleomorphic adenoma was the pre-cancerous lesion of MPA.Therefore,it is necessary to resect the pleomorphic adenoma as early as possible in order to prevent the occurence of the MPA.
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