title: p53, K-ras, c-kit and beta-catenin gene mutations in sinonasal NK/T-cell lymphoma in Korea and Japan.
abstract: Mutations of p53, K-ras, c-kit, and beta-catenin gene were examined in 100 cases of sinonasal NK/T-cell lymphoma (NKTCL) from Korea and Japan. Age of patients ranged from 12 to 72 (median 41.0) in Korea and 27 to 82 (median 61.0) years in Japan. Gene mutations were analyzed on paraffin-embedded specimens by PCR-SSCP followed by direct sequencing. p53 is a well-known tumor suppressor gene. c-kit gene encodes a receptor tyrosine kinase, which plays a crucial role in proliferation and differentiation of hematopoietic stem cells. Mutations of K-ras and beta-catenin are frequently observed in cancers. Thirteen of 42 (31.0%) cases from Korea and 36 of 58 (62.1%) from Japan had p53 mutations, showing significant differences in the incidence of p53 mutation between two countries. Of the Japanese cases 18 (31.0%) had mutations in exon 4, while only 3 cases (7.1%) were found in Korea cases (p<0.01 by chi2 test). K-ras, c-kit and beta-catenin mutations were also found in higher incidence in Japanese cases. In conclusion, different frequency of p53 mutations with different pattern of exon involvement and difference in age of disease onset is evident between sinonasal NKTCL in Korea and Japan.
authors.affiliation: Department of Radiation Biology and Medical Genetics, Osaka University Medical School, Suita, Osaka 565-0871, Japan.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Hongyo
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Hoshida
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Nakatsuka
authors.forename: Mukh
authors.initials: M
authors.lastname: Syaifudin
authors.forename: Shizuo
authors.initials: S
authors.lastname: Kojya
authors.forename: Woo-Ick
authors.initials: WI
authors.lastname: Yang
authors.forename: Yoo-Hong
authors.initials: YH
authors.lastname: Min
authors.forename: Heekyung
authors.initials: H
authors.lastname: Chan
authors.forename: Chan Hwan
authors.initials: CH
authors.lastname: Kim
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Harabuchi
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Himi
authors.forename: Masao
authors.initials: M
authors.lastname: Inuyama
authors.forename: Katsuyuki
authors.initials: K
authors.lastname: Aozasa
authors.forename: Taisei
authors.initials: T
authors.lastname: Nomura
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D003598:Cytoskeletal Proteins; D005260:Female; D016158:Genes, p53; D011905:Genes, ras; D006103:Granuloma, Lethal Midline / Q000235:genetics; D006801:Humans; D007564:Japan; D007694:Killer Cells, Natural; D007723:Korea; D016399:Lymphoma, T-Cell / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009154:Mutation; D010255:Paranasal Sinus Neoplasms / Q000235:genetics*; D019009:Proto-Oncogene Proteins c-kit / Q000235:genetics*; D015534:Trans-Activators; D051176:beta Catenin
chemical_list: C495270:CTNNB1 protein, human; D003598:Cytoskeletal Proteins; D015534:Trans-Activators; D051176:beta Catenin; D019009:Proto-Oncogene Proteins c-kit