MKI67 and hepatocellular carcinoma: Among the 20 lesions in group 1 (HCC tumors with Ki-67 index above 17.5% in validation cohort), the sensitivities of 18F-FDG PET and 18F-FDG PET/CT were 70.00%, 80.00%, which were higher and χ2 test indicated p=0.036, while among the 10 lesions in group 2 (HCC tumors with Ki-67 index below 17.5% in validation cohort) the sensitivities were 0.00%, 20.00%, which were lower and Fisher's test indicated p=0.006.