Carcinoma of the Middle Ear: A Review of the National Cancer Database.

Introduction: Malignancy of the middle ear is a rare condition with limited data available for clinical guidance. Study Design: Retrospective evaluation of a large national database. Setting: Deidentified national cancer database. Patients: Subjects with diagnosis of malignancy of the middle ear in the National Cancer Database between 2004 and 2012. Main Outcome Measures: Demographic information and tumor characteristics were evaluated. The primary endpoint of interest is overall survival. Results: The most common histology was squamous cell carcinoma (SCC) (50%). Multivariable Cox proportional hazard analysis found the following variables had a significant negative impact on overall survival: age (HR 1.04 95% CI [1.02-1.05]), squamous cell carcinoma, not otherwise specified (NOS) (HR 2.08 95% CI [1.30-3.32]), squamous cell carcinoma, keratinizing, NOS (HR 4.20 95% CI [2.14-8.24]), embroynal rhabdomyosarcoma, NOS (HR 4.96 95% CI [1.17-21.11]), and unknown extension (HR 2.87 95% CI [1.22-6.74]). For patients of SCC who underwent surgery, 30 had positive margins and 29 underwent adjuvant radiation. For these, no survival advantage was found with the addition of chemotherapy, regardless of node status. Conclusion: Malignancy of the middle ear is a rare condition with prognosis that depends on histology. The most common histology, SCC, is associated with the poorest overall survival. Evaluation of large national datasets can add significantly to the understanding of such uncommon tumors. Copyright (C) 2017 by Otology & Neurotology, Inc. Image copyright (C) 2010 Wolters Kluwer Health/Anatomical Chart Company

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