Several theories suggest that lung carcinomas are not totally separate entities, but are derived from a common precursor, probably of endodermal origin. The histological classification of lung cancers is complex, with much overlap between groups broadly designated as small cell (SCLC), squamous cell, adenocarcinoma and all others simply termed non-small cell. It is shown here that in vitro exposure of classic, non-adherent SCLC lines to 10 microM 5' bromodeoxyuridine (BrdU) results in a rapid cell-line dependent change to a morphology consistent with an adherent, non-small cell phenotype. Accompanying this morphological shift is a decreased expression of the amplified N-myc protooncogene. These induced changes underline the morphological relatedness of lung carcinoma cell lines.
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