PTTG3P and gastric cancer: The CCK8 assay showed that the absorbance of PTTG3P‐overexpressing cells was significantly higher than that of vector control‐transfected GC cells, suggesting that overexpression of PTTG3P in AGS and HGC‐27 cells leads to increased accumulation of living tumour cells (P < 0.05; Fig. 2C).