IL2 and esophageal cancer: For example, interleukin-1B (IL-1B) C-31T, interleukin-2 (IL-2) -330G, beta2-adrenergic receptor (beta2-AR) Gln27Glu, and aldehyde dehydrogenase 2 (ALDH2) were genotyped by PCR-CTPP for association studies with smoking behavior [13], pylori-induced gastric atrophy [14], severe coronary artery disease [15], and esophageal cancer risk [16], respectively.