Twelve cases of mucoepidermoid carcinoma histologically diagnosed at the, 2nd Department of Oral and Maxillofacial Surgery, School of Dentistry, Iwate Medical University during the period of April 1975 to March l995 were reviwed and clinically studiedFrom this study,we obtained the following results: (1) According to the TNM classification (UICC 1987), the 12 cases of mucoepidermoid carcinoma were classified into 1 case of T1, 5 cases of T2, 5 cases of T3 and l case of T4. In stage grouping, 1 case was in stage I, 5 cases in stage Ⅱ, 4 cases in stageⅢ, and 2 cases in stage IV.
(2) The histological malignancies by g cases were low, and 3 cases were high on the W. H. O. standard.
(3) Five cases were treated by surgery alone, and 7 cases by surgery with chemo-radiotherapy.
(4) Metastases of cervical lymph node were observed in one of the cases of low grade malignancy, and in two of the cases of high grade malignancy. Distant metastasis was observed in one of the cases of low grade malignancy.
(5) The five years and ten years survival rate were both 81.8%.
