Document Detail

P21(waf1/cip1) gene polymorphisms and possible interaction with cigarette smoking in esophageal squamous cell carcinoma in northeastern Iran: a preliminary study.
MedLine Citation:
PMID:  20433229     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The incidence of esophageal squamous cell carcinoma (ESCC) is very high in northeastern Iran. However, the genetic predisposing factors to ESCC in this region have not been clearly defined. The P21(waf1/cip1) gene is involved in the arrest of cellular growth, as induced by the p53 tumor suppressor gene. Two polymorphisms of p21 gene in codon 31 (p21 C98A, dbSNP rs1801270) and the 3'UTR (p21 C70T, dbSNP rs1059234) may affect protein expression and play a role in cancer susceptibility. The present study aimed to investigate the association of p21 polymorphisms in codon 31 and the 3'UTR, and cigarette smoking on the risk of ESCC in northeastern Iran.
METHODS: A case-control study was carried out to detect the p21 polymorphism in the 3'UTR and codon 31 of samples from 126 ESCC cases and 100 controls from 2006 to 2007. There were no significant differences of age and sex between cases and controls. Genotyping of p21 polymorphisms were determined with the PCR-RFLP method. Conditional logistic regression was used to adjust for potential confounders.
RESULTS: None of the p21 genotypes were significantly associated with risk of ESCC, even after adjusting for age and gender (P=0.52, OR=1.24; 95%CI: 0.63-2.42). However, the presence of these polymorphisms in combination with cigarette smoking had a synergistic interaction in ESCC carcinogenesis in northeastern Iran (P=0.02, OR=8.38; 95%CI: 1.03-67.93).
CONCLUSION: Our data suggests that these two p21 polymorphisms, both alone and in combination, are not genetic susceptibility biomarkers for ESCC. However, their interaction with cigarette smoking may influence the susceptibility to ESCC development in northeastern Iran.
Noushin Taghavi; Firouzeh Biramijamal; Mohammad Reza Abbaszadegan; Hooman Khademi; Masoud Sotoudeh; Shahrouz Khoshbakht
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Archives of Iranian medicine     Volume:  13     ISSN:  1735-3947     ISO Abbreviation:  Arch Iran Med     Publication Date:  2010 May 
Date Detail:
Created Date:  2010-05-03     Completed Date:  2010-08-10     Revised Date:  2013-05-15    
Medline Journal Info:
Nlm Unique ID:  100889644     Medline TA:  Arch Iran Med     Country:  Iran    
Other Details:
Languages:  eng     Pagination:  235-42     Citation Subset:  IM    
National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran.
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MeSH Terms
Aged, 80 and over
Carcinoma, Squamous Cell / epidemiology,  genetics*,  pathology
Case-Control Studies
Confidence Intervals
Cyclin-Dependent Kinase Inhibitor p21 / genetics*
Esophageal Neoplasms / epidemiology,  genetics*,  pathology
Genetic Predisposition to Disease / epidemiology*
Iran / epidemiology
Logistic Models
Middle Aged
Odds Ratio
Polymerase Chain Reaction
Polymorphism, Genetic*
Polymorphism, Restriction Fragment Length
Reference Values
Risk Assessment
Smoking / epidemiology,  genetics*
Reg. No./Substance:
0/Cyclin-Dependent Kinase Inhibitor p21

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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