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Frequent p53 Mutations in Head and Neck Cancer¹

Head and Neck Tumor Biology Program, Departments of Microbiology/Immunology [K. D. S., M. A. M., L. S. I.] and Otolaryngology—Head and Neck Surgery [K. D. S., M. A. M., G. L. S.], Eastern Virginia Medical School, Norfolk, Virginia 23501, and Department of Pediatrics, School of Medicine, University of California at Irvine, Irvine, California 92717 [M. E. L., G. G.]

Squamous cell carcinomas of the head and neck (SCCHN) are associated strongly with the use of tobacco and alcohol, but little is known about the molecular pathogenesis of these tumors. In the present study, we analyzed SCCHN for mutations in the tumor suppressor gene p53 by immunocytochemistry and complementary DNA sequencing. Overexpression of p53 protein was detected in 13 (100%) of 13 SCCHN cell lines and in tumor cells cultured directly from 10 (77%) of 13 patients with SCCHN. Direct evidence for p53 mutations was obtained by sequencing p53 complementary DNA from eight SCCHN cell lines and two tumor xenografts. The genetic alterations included seven missense mutations resulting in single amino acid substitutions, a mutation encoding a stop codon, one 10-base pair deletion, and one 2-base pair addition. All seven missense mutations were G to T transversions, five of which were clustered at codons 245 and 248. A similar high frequency of G to T transversions predominates in lung cancer, another tobacco-related disease. Mutation of the p53 gene is the most common genetic alteration detected in SCCHN and implicates this gene locus as a critical site of specific damage by mutagenic carcinogens in tobacco, one of the important risk factors in the etiology of this disease.

¹ Supported by the Medical College of Hampton Roads Foundation.

² To whom requests for reprints should be addressed.

³ Supported by Grant 1RT343 from the Oxnard Foundation, and the Tobacco-Related Disease Research Program (TRDRP).

Received 4/22/92. Accepted 8/25/92.

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