[A promoter polymorphism of CD55 effect on the risk of esophageal cancer]

Objective: This study aimed to investigate the relationship between the genetic variation of CD55 promoter and the risk of esophageal cancer. Methods: A total of 700 esophageal cancer patients recruited between April 2008 and December 2012 at Tangshan Grongren Hospital and Tangshan Renmin Hospital, and 700 frequency matched controls were randomly selected from a pool of cancer free subjects recruited from a nutritional survey. Genotypes of CD55 rs2564978 polymorphism among all subjects were conducted by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). The OR and 95%CI were calculated by non-conditional Logistic regression to evaluate the association of CD55 rs2564978T/C polymorphism with the risk of esophageal cancer. Results: The average age of cases and control was (60.04±9.19) and (59.21±9.98) years old. Compared with CD55 rs2564978 TT carriers, the individuals with CC genotype had a significantly higher risk of esophageal cancer (OR=1.94, 95%CI:1.42-2.66) . When stratified by sex, this genetic variation affected the risk of esophageal cancer among both males (OR=1.92, 95%CI:1.37-2.70) and females (OR=2.34, 95%CI:1.04-5.27). When stratified by age, the CD55 rs2564978 CC was associated with the susceptibility of developing esophageal cancer among younger individuals (OR=1.79, 95%CI:1.19-2.68) and older people (OR=2.32, 95%CI:1.41-3.83).When stratified by drinking status, CC genotype carriers increase the risk of esophageal cancer when drinking (OR=1.93, 95%CI:1.03-3.63) or not drinking (OR=1.95, 95%CI:1.36-2.80). When stratified by smoking status, CC genotype was associated with the risk of esophageal cancer among non-smokers (OR=1.79, 95%CI: 1.13-2.83), light smokers (less than 30 packs/year, OR=1.86, 95%CI:1.31-2.64) and heavy smokers (more than 30 packs/year, OR=2.67, 95%CI:1.28-5.57). Gene-environmental interaction analysis showed that CD55 rs2564978T/C polymorphism interacted with smoking status to increase the risk of esophageal cancer. Conclusion: CD55 rs2564978 polymorphism effects on the risk of esophageal cancer.