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Genetic Predictors That may Lead to Oesophageal Cancer Identified
Some of the major risk factors associated with oesophageal cancer include obesity, smoking and gastro-oesophageal reflux disease.
While the risk factors are quite prevalent in the general population, the incidence rate of esophageal cancer is quite low, which means that only a small percentage of people are genetically predisposed to develop oesophageal cancer.
The researchers have identified 11 single-nucleotide polymorphisms (SNPs) in microRNA-related genes that showed at least a borderline significant association with oesophageal cancer.
A person can have one or more of these SNPs in their genetic makeup, putting him or her into low-risk, medium-risk and high-risk groups.
"We observed a significantly increased risk of oesophageal cancer with increasing numbers of risk genotypes," said Yuanqing Ye, Ph.D., an instructor in the Department of Epidemiology at the University of Texas M. D. Anderson Cancer Center.
In the study, it was found that each unfavourable genotype was associated with an increased cancer risk. Individuals with more than four unfavourable genotypes were more than three times as likely to develop oesophageal cancer.
"Our ultimate goal is to construct a quantitative cancer risk prediction model based on an individual's epidemiological profile, environment exposure and genetic makeup. This risk prediction model can evaluate each person's relative risk and absolute risk of developing oesophageal cancer within a certain time period," said Xifeng Wu, M.D., Ph.D., a professor in the Department of Epidemiology at the University of Texas M. D. Anderson Cancer Center and lead author of the study.
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