To identify the genetic variations in NFKB1 that are associated with a susceptibility to gastric cancer, we examined the NFKB1 region and selected 4 SNP sites from 99 SNP sites in LD of NFKB1: rs12509517 and rs4648068, which are in LD with the tagging SNP rs230539 (r2 > 0.8), and rs4648065 and rs4648037 (r2 < 0.8). The gene discussed is NFKB1; the disease is gastric cancer.