title: Viral loads and E2/NS1 region sequences of hepatitis C virus in hepatocellular carcinoma and surrounding liver.
abstract: OBJECTIVE
  Numerous epidemiologic data have documented that chronic infection by hepatitis C virus (HCV) is a major risk factor for the development of hepatocellular carcinoma (HCC). But the molecular mechanism underlying these strong epidemiologic associations between HCV and HCC has not be elucidated. We observed the changes of HCV in HCC to investigate the association of HCV with HCC.
  
  
  METHODS
  We used competitive and quantitative polymerase chain reaction and dideoxy-nucleotide chain termination method to compare HCV titers and sequences of the hypervariable region of E2/NS1 region of four isolates from the HCC and surrounding cirrhotic liver tissues in tow anti-HCV positive patients.
  
  
  RESULTS
  The copy numbers of HCV-RNA were 1 x 10(6) and 4 x 10(6)/gm wet weight of HCC, and 8 x 10(7) and 3.2 x 10(8)/gm wet weight of cirrhotic liver tissues from patient-1 and -2. The sequence differences between HCV RNA in HCC and in cirrhotic liver were two and five nucleotides in patient-1 and in patient-2 respectively. The amino acid sequences were changed in one and two site in each patient.
  
  
  CONCLUSIONS
  These findings may suggest the possible etiological role of HCV in carcinogenesis of HCC, but complete sequence analysis of HCV including multiple isolates in the same patient, should be performed in many cases.
authors.affiliation: Department of Internal Medicine, College of Medicine, Hallym University, Seoul, Korea.
authors.forename: C K
authors.initials: CK
authors.lastname: Park
authors.forename: T R
authors.initials: TR
authors.lastname: Park
authors.forename: Y B
authors.initials: YB
authors.lastname: Kim
authors.forename: H Y
authors.initials: HY
authors.lastname: Kim
authors.forename: J Y
authors.initials: JY
authors.lastname: Yoo
authors.forename: C H
authors.initials: CH
authors.lastname: Kim
authors.forename: S H
authors.initials: SH
authors.lastname: Choo
authors.forename: J M
authors.initials: JM
authors.lastname: Cho
mesh_terms: D001483:Base Sequence; D006528:Carcinoma, Hepatocellular / Q000235:genetics / Q000503:physiopathology / Q000821:virology*; D046508:Culture Techniques; D016174:Hepacivirus / Q000235:genetics*; D006801:Humans; D008103:Liver Cirrhosis / Q000235:genetics / Q000503:physiopathology / Q000821:virology; D008113:Liver Neoplasms / Q000235:genetics / Q000503:physiopathology / Q000821:virology*; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D012367:RNA, Viral / Q000032:analysis*; D012680:Sensitivity and Specificity; D014759:Viral Envelope Proteins / Q000032:analysis*; D019562:Viral Load; D017361:Viral Nonstructural Proteins / Q000032:analysis*
chemical_list: D012367:RNA, Viral; D014759:Viral Envelope Proteins; D017361:Viral Nonstructural Proteins