Abstract
We analyzed 87 Japanese non-small-cell lung carcinomas (NSCLC), including 30 squamous cell, 51 adenocarcinomas and 6 large-cell carcinomas for loss of heterozygosity (LOH) on the short arm of chromosome 9, and we correlated our findings with clinicopathological features. We used four polymorphic microsatellite markers on 9p (interferon A gene, D9S171, D9S126, and D9S169), which flank the critical region (9p21-22) involved in lung cancer. We observed alterations of DNA sequences at 9p in NSCLC (27 of 82 informative cases or 33%). Concordance among the four markers was high (87%), indicating that the deletions often were relatively large. The 27 genetic alterations observed on 9p include 26 examples of LOH, 1 homozygous deletion, and 1 case with LOH and evidence of microsatellite alteration characterized by shift in band mobility. We noted a high frequency of LOH at 9p especially in, squamous cell carcinoma (17 of 29 informative cases or 59%) and in poorly differentiated NSCLC (12 of 23 informative cases or 52%). There was no correlation between LOH at 9p and the other clinical parameters, including survival, gender, tumor size and the presence of regional or distant metastases. In contrast to other reports we found only rare instances of homozygous deletions (1%) and microsatellite alteration showed as a mobility shift (1%). Our findings demonstrate that LOH at the short arm of chromosome 9 is correlated with squamous cell and poorly differentiated carcinomas in Japanese patients with NSCLC.
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Abbreviations
- SCLC :
-
small-cell lung cancer
- NSCLC :
-
non-small-cell lung cancer
- LOH :
-
loss of heterozygosity
- PCR :
-
polymerase chain reaction
- (CA) n :
-
cytosine adenine
- n :
-
number of repeats
- IFNA:
-
interferon A gene
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Kishimoto, Y., Sugio, K., Mitsudomi, T. et al. Frequent loss of the short arm of chromosome 9 in resected non-small-cell lung cancers from Japanese patients and its association with squamous cell carcinoma. J Cancer Res Clin Oncol 121, 291–296 (1995). https://doi.org/10.1007/BF01209596
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DOI: https://doi.org/10.1007/BF01209596