BTLA and esophageal squamous cell carcinoma: Similarly, Cao et al. who genotyped four BTLA SNPs: rs16859629, rs1982809, rs2171513, and rs3112270 in 721 cases and 1208 HC in the Chinese population, did not find any significant relationship between BTLA polymorphisms and esophageal squamous cell carcinoma (ESCC) in their OS.