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Cytogenetic Abnormalities and Overexpression of Receptors for Growth Factors in Normal Bronchial Epithelium and Tumor Samples of Lung Cancer Patients

Division of Experimental Oncology A [G. S., M. M., C. C., L. L., M. A. P., G. D. P.], Division of Experimental Oncology E [E. T.], Division of Anatomical Pathology and Cytology [S. P.], and Division of Chest Surgery [U. P.], Istituto Nazionale Tumori, Via G. Venezian 1, 20133 Milan, Italy

A cytogenetic analysis was performed on direct preparations and short-term cell cultures of lung tumor and normal bronchial epithelium of 19 patients carrying either a first or a second primary lung cancer. In 9 tumors (6 squamous cell carcinomas, 1 adenocarcinoma, 1 mucoepidermoid carcinoma, and 1 small cell lung carcinoma) successfully analyzed, pseudodiploid and hyperdiploid karyotypes were observed with a heterogeneous pattern of chromosome abnormalities but with a consistent involvement (5 cases) of the short or the long arm of chromosome 3. The normal bronchial epithelial cells had a normal karyotype in 11 patients, whereas in 6 patients clonal and nonclonal chromosomal abnormalities were observed. Involvement of chromosome 7 was present in 4 cases.

In addition, overexpression of the growth factor receptors, epidermal growth factor receptor and HER-2/neu, was found in 9 of 18 tumors and in 6 of 13 bronchial epithelium samples. These findings suggest that early genetic lesions could be present in the normal bronchial epithelial cells that are the target of further complex and multiple genetic changes occurring during the pathogenesis of lung cancer.

Received 7/ 3/90. Accepted 10/ 8/90.

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