title: Comparison of efficacy and safety of tenofovir and entecavir in chronic hepatitis B virus infection: a systematic review and meta-analysis.
abstract: OBJECTIVE
  Tenofovir (TDF) and entecavir (ETV) are both potent antiviral agents for the treatment of chronic hepatitis B virus (HBV) infection. Multiple studies have compared efficacy and safety of these two agents, but yielded inconsistent results. Hence, we conducted a meta-analysis to discern comparative efficacy and safety.
  
  
  METHODS
  Published data relevant to a comparison of TDF and ETV used in HBV were included. HBV DNA suppression rate, ALT normalization rate, and HBeAg seroconversion rate at 24 weeks and 48 weeks were reviewed. Drug safety profiles and resistance were also discussed.
  
  
  RESULTS
  Seven articles met entry criteria. Four and six articles included data for 24 and 48-week HBV DNA suppression rates, respectively, and no significant differences for the rates between the two drugs were found in chronic HBV patients (TDF vs. ETV: relative risk [RR] = 1.10, 95% CI = 0.91-1.33 and RR = 1.07, 95% CI = 0.99-1.17 for 24 weeks and 48 weeks, respectively). For the ALT normalization rate (three studies for 24 weeks, four articles for 48 weeks) and HBeAg seroconversion rate (two and four studies for 24 weeks and 48 weeks, respectively), no difference was observed between TDF and ETV. Additionally, no significant distinction in short term safety was found for CHB patients.
  
  
  CONCLUSIONS
  TDF and ETV are similarly effective and safe in chronic HBV patients after 24 weeks and 48 weeks of anti-viral therapy. Nevertheless, the long-term efficacy and safety of TDF and ETV should be monitored in prolonged therapy.
authors.affiliation: Department of Epidemiology and Biostatistics and Guangdong Key Lab of Molecular Epidemiology, School of Public Health, Guangdong Pharmaceutical University, Guangzhou, Guangdong, China.
authors.forename: Weixia
authors.initials: W
authors.lastname: Ke
authors.affiliation: Department of Epidemiology and Biostatistics and Guangdong Key Lab of Molecular Epidemiology, School of Public Health, Guangdong Pharmaceutical University, Guangzhou, Guangdong, China.
authors.forename: Li
authors.initials: L
authors.lastname: Liu
authors.affiliation: Department of Epidemiology and Biostatistics and Guangdong Key Lab of Molecular Epidemiology, School of Public Health, Guangdong Pharmaceutical University, Guangzhou, Guangdong, China.
authors.forename: Chi
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Department of Epidemiology and Biostatistics and Guangdong Key Lab of Molecular Epidemiology, School of Public Health, Guangdong Pharmaceutical University, Guangzhou, Guangdong, China.
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Ye
authors.affiliation: Department of Epidemiology and Biostatistics and Guangdong Key Lab of Molecular Epidemiology, School of Public Health, Guangdong Pharmaceutical University, Guangzhou, Guangdong, China.
authors.forename: Yanhui
authors.initials: Y
authors.lastname: Gao
authors.affiliation: Department of Epidemiology and Biostatistics and Guangdong Key Lab of Molecular Epidemiology, School of Public Health, Guangdong Pharmaceutical University, Guangzhou, Guangdong, China.
authors.forename: Shudong
authors.initials: S
authors.lastname: Zhou
authors.affiliation: Department of Epidemiology and Biostatistics and Guangdong Key Lab of Molecular Epidemiology, School of Public Health, Guangdong Pharmaceutical University, Guangzhou, Guangdong, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Yang
mesh_terms: D000225:Adenine / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000627:therapeutic use; D000998:Antiviral Agents / Q000009:adverse effects / Q000627:therapeutic use; D006147:Guanine / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000627:therapeutic use; D019694:Hepatitis B, Chronic / Q000188:drug therapy*; D006801:Humans; D063065:Organophosphonates / Q000009:adverse effects* / Q000627:therapeutic use*; D012449:Safety; D000068698:Tenofovir
chemical_list: D000998:Antiviral Agents; D063065:Organophosphonates; C413685:entecavir; D006147:Guanine; D000068698:Tenofovir; D000225:Adenine