Relationship between Epstein-Barr virus and lymphoepithelioma-like carcinoma of the lung: A clinicopathologic study of 6 cases and review of the literature

Lymphoepithelioma-like carcinoma (LELC) is a rare form of lung cancer, usua lly encountered in Chinese patients. Similar to nasopharyngeal carcinoma, L ELC of the lung is strongly associated with Epstein-Barr virus (EBV) infect ion in Asian patients, but there is controversy over whether an association exists in patients from Western countries. To determine whether such a rel ationship exists, we retrospectively studied 6 cases of primary LELC of the lung, all of which were in Western patients. There were 4 men and 2 women, ranging in age from 49 to 75 years. The tumors ranged from 1 to 4.5 cm in diameter. Four patients had stage I disease, 1 had stage IIb disease, and 1 had stage IIIa disease. All patients are alive without evidence of disease with a follow-up of 18 to 30 months. Formalin-fixed, paraffin-embedded tis sue was stained with hematoxylin-eosin for routine evaluation and immunosta ined for keratin and leukocyte common antigen (LCA). LCA staining was perfo rmed to exclude large-cell lymphoma. Immunoperoxidase staining (1:500 clone CSI-4; Dako, Carpinteria, CA) and in situ hybridization were performed to detect EBV. Tumors consisted of solid nests of undifferentiated tumor cells in a syncytial arrangement surrounded by heavy lymphoplasmacytic infiltrat e. Tumor cells stained positively for keratin but negative for LCA. All 6 c ases were negative for EBV, suggesting no association between EBV and LELC in the Western population. HUM PATROL 32:863-872. (C) 2001 by W.B. Saunders Company.