MKI67 and hepatocellular carcinoma: Our study found that FT and PE in the arterial phase were significantly different between the HCC lesions and the distal liver parenchyma in the high Ki-67 expression group, especially the difference in PE in the Kupffer phase between HCC lesions and distal liver parenchyma < − 4.0 × 107 a.u. may contribute to a more accurate diagnosis in the high Ki-67 expression group (Fig. 6).