epidemiological evidence implicating hepadnavirus infection in hcc includes the observation that the geographic distributions of hbv infection and hcc are similar , that the incidence of hcc is much higher in hepadnavirus-infected than uninfected hosts , and that viral dna sequences are integrated in the cellular dna of most ( e.g. , 80 to 90 % ) , but not all , hepadnavirus-associated hcc .
C0012939
viral dna
C0012854
dna