MUC1 and gastric cancer: Several genome-wide association studies have indicated the association between gastric cancer and SNPs of Mucin 1 (MUC1) gene, which codes for the cell surface glycoprotein mucin-1 and is used in clinical practice settings as tumor marker C15-3, in various Asian and European populations (7, 10, 11), besides two SNPs rs4072037 and rs2070803 of MUC1 gene that were found to be associated with increased gastric cancer susceptibility.