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Genetic changes in lung cancer

U Pastorino1, G Sozzi, M Miozzo

  • 1Department of Thoracic Surgery, Istituto Nazionale Tumori, Milano, Italy.

Journal of Cellular Biochemistry. Supplement
|January 1, 1993
PubMed
Summary
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Somatic genetic changes in normal bronchial epithelium precede lung cancer development. These early genetic alterations, including chromosomal rearrangements and gene overexpression, can serve as biomarkers for early detection and screening of lung and upper aerodigestive tract tumors.

Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Lung cancer arises from accumulated somatic genetic changes.
  • Understanding the sequence of these changes is crucial for early detection.
  • Identifying biomarkers in normal tissue can aid in screening.

Purpose of the Study:

  • To define the temporal sequence of somatic genetic changes preceding invasive lung cancer.
  • To identify biological markers for screening multiple primary tumors in the upper aerodigestive tract.

Main Methods:

  • Cytogenetic and genetic analysis of normal bronchial epithelium and primary lung tumors from 68 patients.
  • Analysis included karyotyping and gene alteration detection (EGFR, HER2/NEU, p53).
  • Comparison with normal bronchial epithelium from 5 control patients with metastatic sarcomas.

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Main Results:

  • 76% of tumors showed genetic changes; 46% of normal bronchial epithelium had genetic changes.
  • Common alterations in tumors: chromosomal rearrangements (chromosomes 3, 17, 11) and EGFR overexpression (63%).
  • Rearranged karyotypes in normal bronchial mucosa correlated with those in tumor samples.

Conclusions:

  • Somatic genetic alterations in bronchial epithelium precede lung cancer.
  • These early genetic changes are potential biomarkers for lung and upper aerodigestive tract cancers.
  • Correlations exist between genetic changes and histopathologic/clinical features.