Kamei et al. [43] investigated the expression levels of ULBP genes and NKG2D in 98 patients who received surgery, human gastric cancer cell lines (MKN-74 cells) and gastric cancer tissues from 2004 to 2008, and they found high expression of ULBP1 and ULBP2/5/6 on the MKN-74 cells surface, and that the ULBP1 expression was positive in 70/98 cases. Here, ULBP1 is linked to gastric cancer.