PTEN and gastric cancer: The correlation analysis demonstrated that there was a negative correlation between miR-21 and PTEN in GC (r = −0.865, P < 0.01), while positive correlations were found between miR-21 and Akt/ p-Akt in GC (Akt: r = 0.747, P < 0.001; pAkt: r = 0.804, P < 0.01).