Advanced hepatocellular carcinoma with portal vein thrombosis has a poor prognosis. Concurrent
chemoradiation (CCRT) therapy achieved favorable results in advanced hepatocellular carcinoma with portal vein
thrombosis and can be considered as a treatment option for the management of advanced hepatocellular
carcinoma.2 But, exacerbation of liver function during concurrent chemoradiotherapy is a critical complication in
patients with hepatitis B virus (HBV) related HCC. Reactivation of HBV replication is a well-known complication
in cancer patients receiving chemotherapy. We report two cases with acute exacerbation of liver function. The one
result
ed in hepatic decompensation after CCRT probably due to HCC progression and/or chemoradiotherapy and
the other is due to reactivation of HBV replication after CCRT, who recovered after lamivudine and corticosteroid
therapy.