Malignant parotid tumors in 110 consecutive patients: treatment results and prognosis.

The UICC 1987 classification system was used to retrospectively analyze the treatment results and prognostic factors in 110 consecutive patients. All of the patients had malignant parotid tumors which had been diagnosed and treated during the period from 1970 to 1986. Treatment consisted of surgery, radiotherapy, or a combination. Malignant mixed tumors were seen in 28% of the patients, mucoepidermoid tumors in 18%, adenoid cystic tumors in 15%, acinic tumors in 13%, undifferentiated tumors in 11%, adenocarcinomas in 10%, and other types in 5%. Ten-year corrected survival rate was 52%, and significant differences of survival were found between: 1. patients with disease stages I through IV (I: 85%; II: 69%; III: 43%; IV: 14%); 2. those with local tumor extension (34%) and without local tumor extension (79%); 3. patients with facial nerve palsy (0%) and without facial nerve palsy (57%); and 4. those with low- or intermediate-grade malignant tumors (69% combined) and those with high-grade malignant tumors (30%). After primary treatment, 45% of the patients were cured, and, additionally, 22% were salvaged after local or neck node recurrences. It is concluded that there is a good correlation between TNM classification of UICC 1987 (stage and local extension of tumor) and prognosis, and that facial nerve palsy and grade of malignancy are important prognostic factors.