Atasez rezultatele unui studiu efectuat pe 40 pacienti cu virusul hepatic B pe o perioada de 10.5 ani :
1855
Profound Reduction of HBV Covalently Closed Circular DNA with Long-term Nucleoside / tide Analogue Therapy
1
Medicine, TheUniversity of Hong Kong, Hong Kong SAR, Hong Kong;
2
State Key
Laboratory for Liver Research, The University of Hong Kong, Hong
Kong SAR, Hong Kong;
3
Pathology, The University of Hong Kong,
Hong Kong SAR, Hong Kong;
4
Medicine, Johns Hopkins University
School of Medicine, Baltimore, MD;
5
Medicine, Columbia College
of Physicians and Surgeons, New York City, NY
Background:. Long-term nucleoside / tide analogue (NA) treatment suppresses serum HBV DNA to undetectable levels in a majority of patients We aimed to investigate the effect of long-term NA on the suppression of covalently closed circular DNA (cccDNA) and intrahepatic HBV DNA (ihHBV-DNA).
Methods:
We recruited 40 patients (median age 44.2 years, range 24.3-63.2) who had been on continuous long-term (5 - 10 years) NA All patients had 3 liver biopsies:. At baseline, after 1 year of treatment and at the last follow-up. Serum HBV DNA
and HBsAg were measured by the COBAS TaqMan HBV Test and the Elecsys HBsAg II Assay, respectively (both Roche Diagnostics). ihHBV-DNA and cccDNA were assayed by real-time PCR, with lower limits of detection of 0.001 and 0.005 copies / cell, respectively.
Results: The median duration of treatment was 10.5 years. (Range: 6.0 - 11.9 years) At baseline, 13 patients had 100mg lamivudine, 11 had 600mg telbivudine,
9 had 0.5mg entecavir, 4 had 30mg clevudine, and 3 had 10mg adefovir. At the last follow up, these patients were on 0.5-1.0mg entecavir (n = 23), 600mg telbivudine (n = 9), 10mg adefovir (n = 4), 300mg tenofovir (n = 2), or combination therapy of lamivudine plus adefovir / tenofovir (n = 2). Histology of the third biopsy showed complete resolution of interface hepatitis in 60% of patients with the remainder showing mild-to -moderate activity. Persistent immunoreactivity for HBsAg was found in 80%, the mean number of hepatocytes positive for HBsAg
being 10.4% (range 1-80%). All but 1 (2.5%) was immunoreactive for HBcAg. At baseline, the median serum HBV DNA, HBsAg, ihHBV-DNA and cccDNA levels were 6.84 logIU / mL, 3.38 logIU / mL , 286 copies / cell, and 7.3 copies / cell,
respectively At the time of the last biopsies, 36 (90%) patients had undetectable serum HBV DNA (<20 IU / mL), all but one patient still had detectable HBsAg. (median: 2.74 logIU / mL), all had detectable ihHBV -DNA. (median: 0.4 copies / cell), but 18 (45%) patients had undetectable cccDNA There was a trend of reduction of HBsAg, ihHBV-DNA and cccDNA levels from baseline to 1 year to last follow-up (all p <0.0001). The median log drop of HBsAg at last biopsy was 0.55 logIU / mL.
The median percentage reductions of HBsAg, ihHBV-DNA and cccDNA at last biopsies were 71.46%, 99.85% and 99.89%, respectively.
Conclusions:
Long-term NA treatment significantly reduced cccDNA and ihDNA. 45% of patients had undetectable cccDNA, although small amount of ihHBV-DNA were still
detectable in all patients. Integrated HBV DNA may be a possible source of detectable ihHBV-DNA and HBsAg. Continuous long-term NA therapy can reduce cccDNA to undetectable levels, suggesting a possible end-point of treatment.
