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Primary parotid malignancies. A clinical and pathologic review.
W J Kane1, T V McCaffrey, K D Olsen
1Department of Otorhinolaryngology, Mayo Clinic, Rochester, Minn 55905.
Archives of Otolaryngology--Head & Neck Surgery
|March 1, 1991
Summary
Survival rates for parotid gland cancer vary significantly by histologic type, with acinic cell and adenoid cystic carcinomas showing the best outcomes. Prognostic factors include metastasis, pain, gender, grade, stage, and age.
Area of Science:
- Oncology
- Surgical Pathology
Background:
- Malignant tumors of the parotid gland are rare but require understanding of prognostic factors for effective treatment.
- Histologic classification and clinical staging are crucial for predicting patient outcomes.
Purpose of the Study:
- To analyze survival patterns in patients with primary malignant parotid gland tumors.
- To identify key patient and tumor characteristics influencing prognosis.
Main Methods:
- Retrospective review of 194 patients who underwent parotid gland tumor surgery (1970-1987).
- Kaplan-Meier product-limit method for survival analysis based on histology.
- Cox multiple linear regression to determine prognostic significance of various factors.
Main Results:
- Three distinct survival groups based on histology: highest for acinic cell, adenoid cystic, and low-grade mucoepidermoid carcinomas; intermediate for high-grade mucoepidermoid; lowest for other types.
- Independent prognostic significance identified for: regional metastasis, pain, male gender, tumor grade, stage, and patient age.
- Facial nerve sacrifice was required in 53% of asymptomatic patients at presentation.
- Strong positive correlation between advancing tumor grade and stage.
Conclusions:
- Histologic type is a major determinant of survival in parotid gland malignancies.
- Multivariate analysis reveals critical prognostic indicators beyond histology, including clinical and demographic factors.
- Prognostic assessment should integrate tumor biology, clinical presentation, and patient characteristics for personalized management strategies.