Abnormalities in the Retinoblastoma tumor suppressor gene (Rb) have been observed in a large number of human cancels. Loss of heterozygosity (LOH) is a common mode of allelic inactivation of Rb and other tumor suppressor genes. We investigated DNA from 45 primary human head and neck cancels to determine LOH at the Rb locus using a polymerase chain reaction-based restriction fragment length polymorphism assay. Of informative cases, we found LOH in 4 of 28 (14%) head and neck cancers. By immunohistochemical staining of Rb protein, we found that in one of ten LOH negative cases the nuclei of fibroblasts were stained with anti-Rb antibody but there was no nuclear staining tumor cells. These results suggest that inactivation of Rb protein is involved in the carcinogenesis of head and neck cancer at all levels of the process of protein expression: DNA, mRNA and protein.
|Number of pages||4|
|Publication status||Published - 1996|
- Head and neck cancer
ASJC Scopus subject areas
- Cancer Research