title: Analysis of p53, K-ras, c-kit, and beta-catenin gene mutations in sinonasal NK/T cell lymphoma in northeast district of China.
abstract: Recently we reported the different frequencies of p53 and c-kit gene mutations among sinonasal NK/T cell lymphoma (NKTCL) in Korea, north China (Beijing), and Japan, suggesting some racial, environmental, or life-style differences as a possible cause of nasal tumorigenesis. In this study, gene mutations in p53, c-kit, K-ras, and beta-catenin gene were analyzed by polymerase chain reaction (PCR)-single strand conformation polymorphism (SSCP) followed by direct sequencing in 20 cases of sinonasal NKTCL from northeast China (Shen Yang). Age of patients ranged from 5 to 63 (median, 40.0) years. p53 gene mutations were found in eight of 20 cases (40%), with exon 4 involvement in 10% of cases. The majority was missense mutations and G:C to A:T transition was predominant. The frequency of the c-kit and K-ras gene mutations was low (5%), while that of the beta-catenin gene was six of 20 cases (30%). From these findings, it is concluded that nasal NKTCL in northeast China shared common features with that in Korea in the younger onset of disease compared to that in Japan and lower frequency of p53 gene mutations with infrequent exon 4 involvement compared to that in Japan and north China. These differences might be caused by migration of susceptible populations or some environmental confounding factors.
authors.affiliation: Department of Pathology (C3), Osaka University Medical School, Suita.
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Hoshida
authors.forename: Tadashi
authors.initials: T
authors.lastname: Hongyo
authors.forename: Xinshan
authors.initials: X
authors.lastname: Jia
authors.forename: Yanjiao
authors.initials: Y
authors.lastname: He
authors.forename: Kazuhisa
authors.initials: K
authors.lastname: Hasui
authors.forename: Zhiming
authors.initials: Z
authors.lastname: Dong
authors.forename: Wen-Juan
authors.initials: WJ
authors.lastname: Luo
authors.forename: Maria Francisca
authors.initials: MF
authors.lastname: Ham
authors.forename: Taisei
authors.initials: T
authors.lastname: Nomura
authors.forename: Katsuyuki
authors.initials: K
authors.lastname: Aozasa
mesh_terms: D000293:Adolescent; D000328:Adult; D019943:Amino Acid Substitution; D001483:Base Sequence; D002681:China; D003598:Cytoskeletal Proteins / Q000235:genetics*; D017931:DNA Primers; D005260:Female; D005784:Gene Amplification; D016158:Genes, p53; D011905:Genes, ras; D005843:Geography; D006801:Humans; D016399:Lymphoma, T-Cell / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D020125:Mutation, Missense; D009669:Nose Neoplasms / Q000235:genetics*; D010255:Paranasal Sinus Neoplasms / Q000235:genetics*; D016133:Polymerase Chain Reaction; D019009:Proto-Oncogene Proteins c-kit / Q000235:genetics*; D015534:Trans-Activators / Q000235:genetics*; D051176:beta Catenin
chemical_list: C495270:CTNNB1 protein, human; D003598:Cytoskeletal Proteins; D017931:DNA Primers; D015534:Trans-Activators; D051176:beta Catenin; D019009:Proto-Oncogene Proteins c-kit