title: [Promoter hypermethylation of tumor-associated genes in head and neck cancer].
abstract: An important pathway of gene transcriptional inactivation is hypermethylation at the CpG islands of promoter regions. Some tumor suppressor genes have been reported to harbor promoter hypermethylation in head and neck cancer. We studied DNA hypermethylation of 4 genes in 42 cases of primary head and neck cancer. We applied methylation specific PCR for p16, RAR-beta, RASSF1A, and Fhit genes. Hypermethylation was detected at p16 in 43%, at RAR-beta in 40%, at RASSF1A in 12%, and at Fhit in none of the cases. Hypermethylation of at least one gene was detected in 26 (62%) of the 42 cases. No significant correlation was seen between methylation status and clinicopathological findings or prognosis. Hypermethylation of several tumor-associated genes plays an important role in tumorigenesis of head and neck cancer. We discuss clinical implications and their application.
authors.affiliation: Department of Otolaryngology, Tokai University School of Medicine, Boseidai Isehara.
authors.forename: Kenji
authors.initials: K
authors.lastname: Okami
authors.forename: Akihiro
authors.initials: A
authors.lastname: Sakai
authors.forename: Junichi
authors.initials: J
authors.lastname: Onuki
authors.forename: Takahide
authors.initials: T
authors.lastname: Hamano
authors.forename: Masahiro
authors.initials: M
authors.lastname: Iida
authors.forename: Masahiro
authors.initials: M
authors.lastname: Takahashi
mesh_terms: D017766:Acid Anhydride Hydrolases / Q000235:genetics; D002294:Carcinoma, Squamous Cell / Q000235:genetics*; D018899:CpG Islands; D019175:DNA Methylation; D016147:Genes, Tumor Suppressor; D006258:Head and Neck Neoplasms / Q000235:genetics*; D006801:Humans; D009363:Neoplasm Proteins / Q000235:genetics; D011401:Promoter Regions, Genetic; D018168:Receptors, Retinoic Acid / Q000235:genetics; D025521:Tumor Suppressor Proteins / Q000235:genetics; D000099170:Bis(5'-adenosyl)triphosphatase
chemical_list: D017766:Acid Anhydride Hydrolases; D009363:Neoplasm Proteins; D018168:Receptors, Retinoic Acid; D025521:Tumor Suppressor Proteins; D000099170:Bis(5'-adenosyl)triphosphatase; C411762:RASSF1 protein, human; C082925:retinoic acid receptor beta