HCP5 and gastric cancer: To further substantiate the role of HCP5‐132aa in promoting the malignant proliferation of GC cells, we generated several stable GC cell lines, including HCP5‐132aa KO, HCP5‐132aa KO with re‐expression of HCP5‐132aa (KO+ HCP5‐132aa), HCP5‐132aa KO with re‐expression of HCP5‐132aa mut (KO+ HCP5‐132aa mut), and a negative control (Ctrl).