Two non-small cell carcinoma cell lines from the major histopathologic groups of human lung cancers have been karyotyped: HS-24 was established from a squamous cell carcinoma, and SB-3 was obtained from a metastasis of a poorly differentiated adenocarcinoma. Endoreduplication is characteristic for both cell lines. Subsequent loss of chromosomes led finally to hypotetraploid karyotypes with modal chromosome numbers of 66-68 and 70-72 for HS-24 and SB-3, respectively. The structural analysis was performed by G- and C-banding. Stable overrepresentation of chromosomes 7, 8, 12, and 16 was found. Both cell lines developed a characteristic set of disomic and stable markers. Chromosomes involved in markers were 1, 2, 5, 6, 10, 11, 16, and 17. Consistent numerical and structural normality for chromosomes 4, 18, and 21 was observed.
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