Published in:
Open Access 01-12-2019 | Metastasis | Research article
Predictors of distant metastasis in parotid acinic cell carcinoma
Published in: BMC Cancer | Issue 1/2019
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Background
Distant metastasis (DM) is a common treatment failure pattern in acinic cell carcinoma (AciCC) of the major salivary glands; therefore, the main goal of this study was to analyse the predictors of DM in parotid AciCC.
Methods
Consecutive patients with surgically treated parotid AciCC who were followed for at least 5 years were retrospectively reviewed. Data regarding age, sex, TNM stage, pathologic characteristics, surgical treatment, and follow-up examinations were collected and analysed. The primary end-point was DM control (DMC); the DMC survival was calculated from the date of surgery to the date of event or the latest follow-up examination and analysed by the Kaplan-Meier method. Independent prognostic factors were evaluated by the Cox proportional hazards method.
Results
A total of 144 patients were included. Positive intraparotid nodes (IPNs) were noted in 34 (31.8%) patients. High-grade transformation was noted in 12 (8.3%) patients. A total of 83 (57.6%) patients underwent neck dissection, and neck node metastasis was proven in 37 (44.6%, 37/83) patients. The 10-year DMC rate was 86%. The Cox model analysis confirmed IPN metastasis (1.854 [1.061–4.144], p = 0.011) and high-grade transformation (4.219 [1.948–15.553], p < 0.001) as independent predictive factors of the DMC survival.
Conclusion
IPN metastasis and high-grade transformation are independent prognostic factors of the DMC survival.