[Spontaneous regression of hepatocellular carcinoma after severe acute respiratory syndrome coronavirus 2 vaccination:a case report].

An 86-year-old male patient with sustained virological response of chronic hepatitis type C was diagnosed with hepatocellular carcinoma (HCC) in hepatic segment 3. He was treated with transcatheter arterial chemoembolization (TACE) and radiation therapy because the tumor was located at the edge of the liver and umbilical portion of the portal vein. The value of alpha-fetoprotein (AFP) which is a serological tumor marker decreased, and the tumor size did not increase;however, another tumor was recognized at S3 of the liver 15 months post-TACE.