title: Viral dynamics of hepatitis B virus DNA in human immunodeficiency virus-1-hepatitis B virus coinfected individuals: similar effectiveness of lamivudine, tenofovir, or combination therapy.
abstract: Following treatment of hepatitis B virus (HBV) infection with nucleos(t)ide reverse transcriptase inhibitors (NRTIs), there is a biphasic clearance of HBV, similar to that seen following treatment of human immunodeficiency virus-1 (HIV-1) and hepatitis C virus. Little is known about the impact of combination NRTIs and HIV-1 coinfection on HBV viral kinetic parameters following the initiation of HBV-active highly active antiretroviral therapy (HAART). HIV-1-HBV coinfected patients (n = 21) were enrolled in a viral kinetics substudy of the Tenofovir in HIV-1-HBV Coinfection study (TICO). TICO was a randomized (1:1:1) trial of tenofovir disoproxil fumarate (TDF, 300 mg) versus lamivudine (LMV, 300 mg) versus TDF/LMV within an efavirenz based HAART regimen initiated in HIV-1-HBV coinfected antiretroviral naïve individuals in Thailand. HBV DNA was measured frequently over the first 56 days. To fit the viral load data, we used a model of HBV kinetics that allows the estimation of treatment effectiveness, viral clearance and infected cell loss. We observed a biphasic decline in HBV DNA in almost all patients. We did not observe any significant differences in HBV viral dynamic parameters between the three treatments groups. Overall, median (interquartile range) HBV treatment effectiveness was 98% (95%-99%), median HBV virion half-life was 1.2 days (0.5-1.4 days), and median infected cell half-life was 7.9 days (6.3-11.0 days). When we compared hepatitis B e antigen (HBeAg)-positive and HBeAg-negative individuals, we found a significantly longer infected cell half-life in HBeAg-positive individuals (6.2 versus 9.0 days, P = 0.02).
  
  
  CONCLUSIONS
  HBV viral dynamic parameters are similar following anti-HBV NRTI monotherapy and dual combination therapy in the setting of HIV-1-HBV coinfection. HIV-1 coinfection has minimal effect on HBV viral dynamics, even in the setting of advanced HIV-1-related immunosuppression.
authors.affiliation: Infectious Diseases Unit, Alfred Hospital, Melbourne, Australia.
authors.forename: Sharon R
authors.initials: SR
authors.lastname: Lewin
authors.forename: Ruy M
authors.initials: RM
authors.lastname: Ribeiro
authors.forename: Anchalee
authors.initials: A
authors.lastname: Avihingsanon
authors.forename: Scott
authors.initials: S
authors.lastname: Bowden
authors.forename: Gail
authors.initials: G
authors.lastname: Matthews
authors.forename: Pip
authors.initials: P
authors.lastname: Marks
authors.forename: Stephen A
authors.initials: SA
authors.lastname: Locarnini
authors.forename: Kiat
authors.initials: K
authors.lastname: Ruxrungtham
authors.forename: Alan S
authors.initials: AS
authors.lastname: Perelson
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Dore
mesh_terms: D000225:Adenine / Q000031:analogs & derivatives* / Q000627:therapeutic use; D000328:Adult; D019380:Anti-HIV Agents / Q000627:therapeutic use*; D023241:Antiretroviral Therapy, Highly Active; D001706:Biopsy; D004279:DNA, Viral / Q000097:blood*; D004359:Drug Therapy, Combination; D005260:Female; D015658:HIV Infections / Q000150:complications; D015497:HIV-1; D006509:Hepatitis B / Q000150:complications / Q000188:drug therapy* / Q000473:pathology / Q000821:virology; D006515:Hepatitis B virus; D006801:Humans; D007165:Immunosuppression Therapy; D019259:Lamivudine / Q000627:therapeutic use*; D008099:Liver / Q000473:pathology / Q000821:virology; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D063065:Organophosphonates / Q000627:therapeutic use*; D011446:Prospective Studies; D000068698:Tenofovir; D019562:Viral Load; D055815:Young Adult
chemical_list: D019380:Anti-HIV Agents; D004279:DNA, Viral; D063065:Organophosphonates; D019259:Lamivudine; D000068698:Tenofovir; D000225:Adenine