Chromosomal alterations in the clonal evolution to the metastatic stage of squamous cell carcinomas of the lung

Abstract

Comparative genomic hybridization (CGH) was applied to squamous cell carcinomas (SCC) of the lung to define chromosomal imbalances that are associated with the metastatic phenotype. In total, 64 lung SCC from 50 patients were investigated, 25 each with or without evidence of metastasis formation. The chromosomal imbalances summarized by a CGH histogram of the 50 cases revealed deletions most frequently on chromosomes 1p21-p31, 2q34-q36, 3p, 4p, 4q, 5q, 6q14-q24, 8p, 9p, 10q, 11p12-p14, 13q13-qter, 18q12-qter and 21q21. DNA over-representations were most pronounced for chromosomes 1q11-q25, 1q32-q41, 3q, 5p, 8q22-qter, 11q13, 12p, 17q21-q22, 17q24-q25, 19, 20q and 22q. In ten cases, paired samples of primaries and at least one metastasis were analysed. The comparison revealed a considerable chromosomal instability and genetic heterogeneity; however, the CGH pattern indicated a clonal relationship in each case. The difference in histograms from the metastatic and non-metastatic tumour groups was most useful in pinpointing chromosomal imbalances associated with the metastatic phenotype, indicating that the deletions at 3p12-p14, 3p21, 4p15-p16, 6q24-qter, 8p22-p23, 10q21-qter and 21q22, as well as the over-representations at 1q21-q25, 8q, 9q34, 14q12 and 15q12-q15, occurred significantly more often in the metastatic tumour group. The comparison of the paired samples confirmed these findings in individual cases and suggested distinct genetic changes, in particular the extension of small interstitial deletions, during tumour progression. Importantly, metastasis-associated lesions were frequently detectable in the primary tumour providing a method of identifying patients at risk for tumour dissemination. Individual profiles and histograms are accessible at our web site http://amba.charite.de/cgh.

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Cited by papers we hold 3

• Array-comparative genomic hybridization reveals loss of SOCS6 is associated with poor prognosis in primary lung squamous cell carcinoma. · 2012
  Not checked
• Integrative Genome Comparison of Primary and Metastatic Melanomas · 2010
  No notice
• Gene Expression Signature of Cigarette Smoking and Its Role in Lung Adenocarcinoma Development and Survival · 2008
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