Squamous cell carcinoma of the maxillary sinus: A population-based analysis.

OBJECTIVES/HYPOTHESIS Squamous cell carcinoma (SCC) accounts for > 90% of head and neck cancers and 60% to 75% of malignancies of the paranasal sinuses. The most commonly affected paranasal sinus is the maxillary. Epidemiologic, incidence, and survival trends have been studied for maxillary sinus SCC (MSSCC), but far less is known about its metastatic potential. STUDY DESIGN Retrospective database analysis. METHODS The Surveillance, Epidemiology, and End Results database was used to extract frequency, incidence, and survival data for MSSCC between 2004 and 2012. The resultant cases were stratified according to patient demographics and collaborative stage information, including extent of disease, lymph node involvement, TNM staging, and regional and distant metastasis. RESULTS A total of 854 cases of MSSCC were identified. The mean age at diagnosis was 66.6 years, with 87.4% presenting at > 50 years. Most patients (65.1%) were male. Whites accounted for 74.6% of cases. A majority (64.3%) of cases presented with stage IV disease. Overall 5-year disease-specific survival was 23.4%. Neck involvement was seen in 7.6% of T1 tumors, 22.2% of T2 tumors, 18.5% of T3 tumors, and 12.2% of T4 tumors. Distant metastasis was not seen in T1-T3 tumors, but was present in 6.8% of T4 tumors. CONCLUSIONS MSSCC is a rare entity with poor overall prognosis. The majority of patients included in this study were white males aged ≥50 years, with most tumors presenting at advanced stages. Nodal involvement and distant metastasis are poor prognostic indicators. T1-T3 tumors did not metastasize to distant sites. LEVEL OF EVIDENCE 4.