Nodal involvement and p16-staining in upper alveolar ridge and hard palate cancer

Abstract

Aim: Upper alveolar ridge and hard palate squamous cancer is an infrequent malignancy. We evaluated factors associated with neck involvement and with p16-staining.

Methods: Head and neck squamous-cell carcinoma (SCC) patients who went to Head and Neck Department between 1997 and 2011 were screened, and 73 resected upper alveolar ridge and 5 hard palate SCC were selected. Tumors with available tissue were stained with p16 immunohistochemistry.

Results: Median age was 64.4 years, 55.1% were female, and 73.1% were in clinical stage IV. Neck dissections were performed in 24 and pathologically confirmed node metastases were found in 19 (24.3%). Cervical recurrence was found in 18 patients (23.1%) and was associated with histological grade (P = 0.037). Three (7.3%) of 41 lesions were positive for p16 and tended to be younger (P = 0.067). Lymphovascular invasion was associated with shorter disease-free survival (DFS) (P = 0.026) and overall survival (OS) (P = 0.021). Larger cT (P = 0.019), perineural invasion (P = 0.039) and neck dissection (P = 0.010) were associated with shorter OS. Neck node involvement tended to have shorter DFS (31% vs. 48.7%, P = 0.278) and OS (25.1% vs. 48.5%, P = 0.340), and neck recurrence tended to have shorter OS (9.3% vs. 52.3%, P = 0.064).

Conclusion: Neck involvement and recurrence are frequent in this location. P16-positive cases were present in 7.3% and tended to be associated with younger age.

Keywords

P16 / head / neck / maxilla / prognosis / survival

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