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Loss of heterozygosity (LOH) on human chromosome 11 has been reported in a variety of human cancers. To search for the existence of tumor-suppressor gene(s) associated with oral squamous cell carcinoma (SCC) on chromosome 11, we have performed high-resolution deletion mapping in 31 patients with oral SCC using 22 microsatellite markers for this chromosomal region. LOH was observed in 14 of 25 cases (56.0%) that were informative with at least one locus. Most allelic deletions detected in our study were specific to the long arm of the chromosome. Furthermore, the data presented here show 2 distinct, commonly deleted regions. The first region, with frequent LOH, was restricted between markers DIIS939 and DIIS924 separated by 3 centimorgans (cM) on chromosome 11q23. The second region of common deletion was identified between markers DIIS912 and DIIS910, separated by 7 cM at 11q25. Our results suggest that at least 2 tumor-suppressor genes involved in the development of oral SCC are present on the long arm of chromosome 11.
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