NOS2 and hepatocellular carcinoma: Although multivariate COX regression analysis failed to obtain results with statistical significance, differences could be seen in the survival curves for H-score of apoE3, H-score of apo4, H-score ratio of apoE2 and apoE4, total apoE H-score and H-score of iNOS in tumour tissues, suggesting that these indicators were associated with recurrence of HCC and also consistent with the trend of OS.