For cells derived from por-type GC, the most frequent histological type of gastric malignancy [3], CTSE expression is diverse: MKN-45, KE-39, HuG1-PI, HuG1-N, and AGS strongly express CTSE, whereas GCIY and HGC-27 are deficient in CTSE expression. The gene discussed is CTSE; the disease is gastric cancer.