Prognostic factors in head and neck adenoid cystic carcinoma
Introduction
Adenoid cystic carcinomas (ACC) are uncommon head and neck tumors, corresponding to 4–10% and 7.5% of all epithelial tumors and malignancies of the salivary glands respectively.1, 2 ACC typically presents an indolent and slow growth associated to frequent late distant metastases, which are together with local recurrences, the reasons for the low long-term survival rate.2, 3, 4
Standard treatment has not yet been established, although many series of ACC have been described. Some authors have reported an increase local control of the disease with combined surgical and radiotherapy treatments.5 However, other studies were not able to demonstrate a significant effect for postoperative radiotherapy.4, 6 Several studies showed that advanced clinical stage and solid histological subtype are relevant prognostic factors associated with survival of the patients.4, 6, 7 Some immunohistochemical markers, such as p53, bcl-2 and cell proliferation markers have been associated to survival of patients with ACC.8, 9, 10, 11 Nevertheless few studies have associated survival with the clinical, histological and immunohistochemical features in a large series of head and neck ACC. Therefore, the aim of this study was to analyze the clinical, histological and immunohistochemical prognostic factors of 129 patients with ACC treated in a single institution.
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Patients and methods
Between the years of 1955 and 1997, all patients diagnosed as having ACC, from the Department of Head and Neck Surgery and Otorhinolaryngology, Hospital do Cancer A. C. Camargo, Sao Paulo, Brazil, were included in this study. This study was performed with the approval of the Human Research Ethics Committee of this Hospital. Clinical, epidemiological, treatment and follow-up data were obtained from the medical records. TNM restaging was established according to Sobin and Wittekind.12 All cases
Clinical
Of the 129 patients with ACC included in this study, 71 were male (55%) and 58 female (45%), giving a male-female ratio of 1.22:1. The mean age of the patients was 51.5 years (range 10–96 years), being the women older (mean 53.4 years) than men (mean 50.2 years). The mean time of complaints was 39.4 months (range 1–360 months), and the most common signs and symptoms were the presence of a nodule (92.1%), pain (59.8%), paresthesia (12.6%) and nasal congestion (11.8%). Most tumors involved the
Discussion
Adenoid cystic carcinoma most commonly occurs during the fifth and sixth decades of life,3, 4, 7 as in our series. In children and adolescents, ACC is extremely rare.13 We found a slight male predilection, although other studies showed a female or no gender predilection.2, 4, 6, 7 ACC occurs mainly in the intraoral salivary glands, particularly in the palate, and parotid, followed by submandibular, extraoral, and sublingual salivary glands,7, 14 similar to our findings. However, other sites in
Acknowledgements
This work was supported by The State of Sao Paulo Research Foundation (FAPESP) and National Council for Scientific and Technological Development (CNPq), Brazil.
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