HLA-G and gastric cancer: Previous published research articles revealed that the DEL allele exerts an effect on the stability and levels of HLA-G mRNA (25, 48) and on the levels of soluble HLA-G protein (26, 49), and reinforce the notion that the log-additive model is the one that best fits our study, since the high frequency of DEL/DEL patients (50.9%) implies a strong genetic predisposition of this genotype in the development of gastric cancer, tightly related to a high expression of HLA-G: the more DEL is present in the transcript the more the HLA-G mRNA is stabilized and translated.