title: Interleukin-1 receptor antagonist gene polymorphism in human colorectal cancer.
abstract: Several studies indicate that local immunoregulation and associated cytokines have a putative role in the development of cancer. There is evidence that pro-inflammatory cytokines such as interleukin-1 (IL-1) are critically involved with tumour progression. IL-1 receptor antagonist (IL-1Ra) is known to down-regulate and limit the inflammatory response. Therefore we attempted to examine the influence of the known polymorphism of the IL-1Ra gene on the development of human colorectal cancer (CRC). The study included 125 patients with CRC and 134 controls. Variable number tandem repeat (VNTR) polymorphism in intron 2 of the IL-Ra gene was analysed by the polymerase chain reaction method. There was a significant difference in genotype distribution between CRC patients and controls (P=0.025) and also in allelic frequencies (P=0.012). In detail the carriage rate of allele 3 in CRC patients was significantly increased compared with controls (P=0.007). We also found that the allelic distribution differs significantly between colon and rectum (P=0.041) and that allele 3 was overabundant in colon. The frequency of allele 1 in CRC patients with localized disease (Dukes A+B) was higher compared with disseminated disease (Dukes C+D), (P=0.035). These findings therefore suggest that the IL-1Ra polymorphism is associated with colorectal carcinogenesis.
authors.affiliation: Center of Biotechnology, Vietnam National University, Hanoi, Vietnam.
authors.forename: Hung Trinh
authors.initials: HT
authors.lastname: Viet
authors.forename: Dick
authors.initials: D
authors.lastname: Wågsäter
authors.forename: Anders
authors.initials: A
authors.lastname: Hugander
authors.forename: Jan
authors.initials: J
authors.lastname: Dimberg
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000483:Alleles; D015179:Colorectal Neoplasms / Q000235:genetics*; D016207:Cytokines / Q000378:metabolism; D018450:Disease Progression; D004587:Electrophoresis, Agar Gel; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D005787:Gene Frequency; D005838:Genotype; D006801:Humans; D007249:Inflammation; D053590:Interleukin 1 Receptor Antagonist Protein; D007438:Introns; D008297:Male; D008875:Middle Aged; D018598:Minisatellite Repeats; D008957:Models, Genetic; D015233:Models, Statistical; D009369:Neoplasms / Q000235:genetics; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D012091:Repetitive Sequences, Nucleic Acid; D012795:Sialoglycoproteins / Q000235:genetics*
chemical_list: D016207:Cytokines; C507763:IL1RN protein, human; D053590:Interleukin 1 Receptor Antagonist Protein; D012795:Sialoglycoproteins