ICAM1 and type 1 diabetes mellitus: The major allele G at this SNP, associated with higher PCA frequency in T1D cases, has also been associated with multiple traits including higher circulating levels of soluble intercellular adhesion molecule 1 (sICAM-1, [21]) and E-selectin [22], higher gastric ulcer risk [23] and lower pancreatic cancer risk [24], indicating that this blood group determinant enzyme has pleiotropic effects.