GKN1 and gastric cancer: Two years after that study, Yoon et al. [64] conducted an investigation (containing 5 sporadic GC patients who had undergone a gastrectomy) on the specific uptake of exosomes from normal human gastric mucosa epithelial cells HFE-145 and examined the anticancer activity of exosomal GKN1 by immunofluorescence, WB and protein microarray chip.