PD-L1 is expressed in some human cancers, whereas B7-H4 is highly expressed in numerous types of human cancers, including melanoma [18], breast [6], non-small cell lung [7], ovary [35], kidney [36], prostate [28], esophagus [16], pancreas [37], and stomach cancer [13]. This evidence concerns the gene VTCN1 and gastric neoplasm.