title: Long-term outcome of tenofovir disoproxil fumarate use against hepatitis B in an HIV-coinfected cohort.
abstract: OBJECTIVE
  Tenofovir disoproxil fumarate (TDF) is active against hepatitis B virus (HBV) and HIV. However, the long-term efficacy of tenofovir disoproxil fumarate (TDF) is not well known and the appearance of resistance is a major concern. We have studied the efficacy of TDF against HBV in patients treated at an Infectious Diseases Unit.
  
  
  METHODS
  We carried out a retrospective observational study of the efficacy of TDF against HBV replication in a cohort of 52 HIV-coinfected patients who received TDF for at least 6 months.
  
  
  RESULTS
  The median duration of follow-up of TDF treatment was 34 months. Forty-one patients (79%) were positive for HBV envelope antigen (HBeAg) and 35 had received previous lamivudine monotherapy for a median duration of 32 months. Virological breakthrough was observed in nine cases (17%). At the end of the follow-up period, HBV DNA levels were <1000 copies/mL in 42 patients (81%) and <200 copies/mL in 31 patients (60%). There were no significant differences between the lamivudine-naïve and lamivudine-experienced groups. In the lamivudine-experienced group, the duration of previous lamivudine monotherapy was associated with failure to achieve HBV DNA levels <200 copies/mL (P=0.036). Adding lamivudine or emtricitabine to TDF did not improve virological suppression. In 39 patients who achieved <200 HBV DNA copies/mL during TDF treatment, virological breakthrough was seen only in two patients (5%) after a median follow-up duration of 39.7 months.
  
  
  CONCLUSIONS
  TDF was able to control HBV replication in most HIV-coinfected patients after a median follow-up duration of 34 months, regardless of previous lamivudine treatment. However, a sizeable proportion of patients developed virological breakthrough.
authors.affiliation: Monsall Unit, Department of Infectious Diseases, North Manchester General Hospital, Manchester, UK. gerardouria@gmail.com
authors.forename: G
authors.initials: G
authors.lastname: Alvarez-Uria
authors.forename: L
authors.initials: L
authors.lastname: Ratcliffe
authors.forename: Jf
authors.initials: J
authors.lastname: Vilar
mesh_terms: D000225:Adenine / Q000031:analogs & derivatives* / Q000627:therapeutic use; D000328:Adult; D000998:Antiviral Agents / Q000627:therapeutic use*; D004279:DNA, Viral / Q000097:blood; D003841:Deoxycytidine / Q000031:analogs & derivatives / Q000627:therapeutic use; D024882:Drug Resistance, Viral; D004359:Drug Therapy, Combination; D000068679:Emtricitabine; D005260:Female; D015658:HIV Infections / Q000150:complications*; D006509:Hepatitis B / Q000097:blood / Q000150:complications / Q000188:drug therapy*; D006511:Hepatitis B Antigens / Q000097:blood; D006515:Hepatitis B virus / Q000187:drug effects* / Q000502:physiology; D006801:Humans; D019259:Lamivudine / Q000627:therapeutic use; D008297:Male; D063065:Organophosphonates / Q000627:therapeutic use*; D012189:Retrospective Studies; D018894:Reverse Transcriptase Inhibitors / Q000627:therapeutic use; D000068698:Tenofovir; D013997:Time Factors; D016896:Treatment Outcome; D014779:Virus Replication / Q000187:drug effects
chemical_list: D000998:Antiviral Agents; D004279:DNA, Viral; D006511:Hepatitis B Antigens; D063065:Organophosphonates; D018894:Reverse Transcriptase Inhibitors; D003841:Deoxycytidine; D019259:Lamivudine; D000068698:Tenofovir; D000068679:Emtricitabine; D000225:Adenine