In my research, the association between lung cancer risk and EGFR polymorphisms, there was a significant association between rs712829(-216G/T) polymorphism and adenocarcinoma. but I faced a contraindicated result with previous studies in China and USA. the risk genotype pattern was GG in my study, however for China was TT. I interpreted this by ethnicity difference. Any suggestions to be more confident about my interpretation, or even if there are other ideas?