Primary tracheobronchial mucoepidermoid carcinoma: prognostic factors and EGFR mutation analysis of 33 cases

Primary pulmonary mucoepidermoid carcinoma (PMEC) is a rare neoplasm with a frequency of only 0.1–0.2% in primary lung carcinomas (1). PMEC is currently defined as a malignant epithelial tumor, composed of mucus-producing cells as well as intermediate and squamoid cells arranged in solid, glandular or cystic patterns