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J Thorac Cardiovasc Surg 1994;107:1095-1098
© 1994 Mosby, Inc.

GENERAL THORACIC SURGERY

Carcinogen-specific mutations in the p53 tumor suppressor gene in lung cancer

Vienna, Austria

From the Second Department of Surgery, University of Vienna, and KIMCL, Department of Molecular Biology, University of Vienna, Vienna, Austria

Address for reprints: Daniela Kandioler, MD, Second Department of Surgery, University of Vienna, Spitalgasse 23, A-1090 Vienna, Austria.

Abstract

Mutations of the p53 tumor suppressor gene, whose encoded protein is one of the chief regulators of the cell cycle, are proving to be the most common genetic alteration in human cancer. Point mutations have been detected in numerous human solid tumors. The types of point mutations in the p53 gene vary considerably in different kinds of human cancers, suggesting that specific etiologic agents are responsible for typical kinds and sites of mutations in the p53 gene. This study reports the detection of two unusual p53 mutations in a series of patients with lung cancer. The first case showed a one-base pair deletion at the end of exon 8, which is rarely affected by mutations, leading to a frameshift involving the following intron 8, exon 9, and intron 9. The second case exhibited two point mutations in codon 273, both either localized in the same codon on one allele or each mutation localized on a different allele in codon 273. Interestingly, the two mutations can be attributed to different mechanisms of base substitution. This is the first report of this kind. Because of evidence that the nature and site of p53 mutations reflect not only the mutagens involved in tumorigenesis but also the capacity for malignant transformation, the characterization of mutations of the p53 gene may provide a basis for assessing further risk factors, as well as for estimating prognosis in patients with lung cancer. (J THORACCARDIOVASCSURG1994;107:1095-8)

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