title: Cytokeratin-negative small cell lung carcinoma.
abstract: Cytokeratins (CK) are good markers of epithelial tumors, and most of carcinomas including small cell lung carcinoma (SCLC) expresses CK. Herein reported is a case of SCLC without CK expression.
authors.affiliation: Department of Pathology, Shizuoka City Shimizu Hospital, Shizuoka, Japan.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Terada