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544例腮腺多形性腺瘤中，恶性18例，占3．3％，其中癌变16例，原发性恶性多形性腺癌2例。除细胞间变外，具有肿瘤的侵袭性及快速增殖的特征：包膜浸润、侵犯邻近组织、血管内瘤栓、核分裂象增多等对诊断更有意义。在526例良性痛中女性多见，计有315例，占59．8％，年龄多为20～52岁；而此痛伴癌变者16例中以男性居多11例，占68.8％，常见于50岁以上。组织学类型，未分化癌居多，占43．7％，而腺癌仅占31．2％，一般未分化癌预后较差。
544 cases of parotid pleomorphic adenoma, 18 cases of malignant, accounting for 3.3%, of which 16 cases of cancerous, primary malignant pleomorphic adenocarcinoma in 2 cases. In addition to intercellular changes, with tumor aggressive and rapid proliferation of features: envelope invasion, invasion of adjacent tissues, intravascular tumor thrombus, increased mitosis, etc. more meaningful for the diagnosis. In 526 cases of benign pain in women more common, accounting for 315 cases, accounting for 59.8%, more than 20 to 52 years of age; and this pain with cancer in 16 cases, mostly male in 11 cases, accounting for 68.8%, common in Over 50 years old. Histological type, mostly undifferentiated carcinoma, accounting for 43.7%, while adenocarcinoma accounted for only 31.2%, poor prognosis of undifferentiated carcinoma.