BIRC5 and nasopharyngeal carcinoma: Furthermore, we have analyzed and compared the BIRC5 -31C/G polymorphism in populations from Taiwan (one of the regions with high NPC incidence), Hubei province (Central China) and Jiangsu province (Eastern China) based on available published data [31], [32], [37], and also compared the SNP with 11 populations from HapMap to see how different they are from our own study.