Background: Sinonasal mucosal melanoma is a rare disease associated with a very poor prognosis. Because most of the series extend retrospectively several decades, we sought to determine prognostic factors and outcomes with recent treatment modalities.
Methods: A retrospective chart review of 58 patients treated for sinonasal melanoma at a tertiary cancer center between 1993 and 2004. The patients were retrospectively staged according to the sinonasal American Joint Committee on Cancer (AJCC) staging system. Demographic, clinical and pathological parameters were identified and correlated with outcomes.
Results: There were 35 males and 23 females with a median age of 63 years; 56 patients were treated surgically and 33 received radiation therapy. According to Ballantyne's clinical staging system, 88% of the patients presented with stage I (local) disease. Classification by the AJCC staging classified yielded 27% of the patients with T1, 33% with T2, 21% with T3, and 19% with T4. T-stage and the degree of tumor pigmentation were associated with a worse survival (P = .0096 and P = .018, respectively), while pseudopapillary architecture was associated with a higher locoregional failure (P = .0144). Postoperative radiation therapy improved locoregional control when a total dose greater than 54 Gy was used (P = .0215), but did not affect overall survival.
Conclusions: Tumor stage according to sinonasal AJCC staging system is an effective outcome predictor and should be the staging system of choice. Postoperative radiation therapy improves locoregional control when a higher dose and standard fractionations are used. Histological features such as pigmentation and pseudopapillary architecture are associated with worse outcome.
(c) 2010 American Cancer Society.