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Goals of therapy in HBV patients
• Prevent the development of cirrhosis, hepatic failure, liver cancer and liver-related deaths
• Intermediate endpoints predicting clinical benefits:
– Sustained suppression of HBV DNA
– HBeAg seroconversions
– HBsAg anti-HBs (best marker of immune control)
HBV probably is never cured, but rather controlled
Preferred First Line Therapy
• Peginterferon*
• Entecavir
• Tenofovir
• Tenofovir (or peginterferon) for lamivudine resistant infection
• Non-preferred HBV drugs may have role in special populations
*contraindicated in decompensated cirrhosis
AASLD Guidelines 2009 EASL Guidelines 2009 APASL Guidelines 2008
Treatment of HBeAg-Positive CHB Key Aspects of Treatment
• Preferred drugs have very low risk of resistance in treatment-naïve patients
– Tenofovir: 0% at 4 yrs (0% in LMVr)
– Entecavir: 1-2% at 3-4 yrs
– Peg-IFN: non-issue
• HBeAg seroconversion is “sentinel event”
– Duration of therapy linked with this outcome
• HBsAg is highly desired
– HBeAg loss is prerequisite but other factors emerging
Controversies/Evolving Areas
• Peg-IFN: when to consider using
• Durability of HBeAg seroconversion
• Mono vs combination therapy in treatment-naïve patients
Predictors of Response HBeAg+ CHB
Traditional
• Elevated ALT
• Lower baseline HBV
DNA
• HBV genotype – A and B > C and D
Emerging
• Presence of PC/BCP mutations
• IL28 B genotype
• HBsAg level at baseline and during treatment
HBeAg Seroconversion Rates by HBV Genotype and IL28B Type
A B C D
Sonneveld M, Gastroenterology, 2012;142:513-20
Durability of HBeAg Seroconversion with NA Therapy
• Conflicting results in literature
– Durability rates of 30-90%
• Potential causes for variability
– HBV DNA level at time of discontinuation
– Duration of consolidation
– Antiviral used • N=42 NA-treated patients with seroconversion • F/U mean 56 mos post seroconversion • 44% HBeAg recurrence and 50% HBV DNA >10K copies/mL
Dienstag JL, Hepatology 2003;37:748-55 Song BC Hepatology 2000;32:803-6 Reijnders J, Gastroenterology. 2010 Aug;139(2):491-8
Monotherapy Vs. Combination Therapy for Treatment-Naïve CHB
Lok AS, Gastroenterology, 2012;143(3):619-28.
Implications of New Findings
• IL28B, HBV genotype and presence of PC/BCP mutations affect HBeAg and HBsAg clearance – Favorable IL28B genotype -> consider peg-IFN as first
line therapy
• Durability of HBeAg seroconversion likely enhanced by: – Use preferred antiviral drugs
– Longer duration of consolidation therapy
• No role for combination therapy in treatment-naive patients treated with drug with higher genetic barrier to resistance
Treatment of HBeAg-Negative CHB Key Aspects of Treatment
• Preferred drugs associated with very low risk of resistance in treatment-naïve patients – Tenofovir: 0% at 4 yrs – Entecavir: 1-2% at 3-4 yrs – Peg-IFN = non-issue
• Sustained suppression of HBV DNA is immediate treatment goal
• HBsAg loss is highly desired – More frequently achieved with peg-IFN than NAs – Long-term NA therapy necessary for many – Treatment withdrawal of NA may be key
Controversies/Evolving Areas
• Duration of therapy if NA used
– Discontinuation to identify sustained responders
– Adherence issues
• Enhancing HBsAg loss
– Role of peg-IFN
5-Year Follow-Up After Discontinuing
Long-Term Adefovir Therapy
Hadziyannis S, et al. J Hepatol. 2009;50(suppl 1):S9. Abstract 18
Peg-IFN Add-On Therapy
• N=12 patients, peg-IFN added to NA therapy, HBeAg+ – 2/12 seroconverted after peg-IFN X 24 weeks
• Patient A - HBeAg-positive, genotype A, HBVDNA negative on entecavir plus tenofovir for 10 months
• Patient B - HBeAg negative, genotype D, cirrhosis – on entecavir with HBV-DNA non detectable for 27 mos
Kittner JM, J Clin Virol 2012;54:93-5
Summary
• Treatment initiation: ALT and HBV DNA levels all you need to make decision – Severity of histologic disease additional guide in those with
“borderline values” – HBeAg may influence choice of drugs
• Tenofovir, entecavir, and peginterferon are preferred firstline drugs – Peg-IFN offers finite therapy but more side effects – NA well tolerated and effective in achieving viral suppression
• HBsAg loss is desired goal of therapy – Peg-IFN more likely to achieve this, especially in HBeAg negative
CHB – HBV genotype, IL28B genotype, PC/BCP influence conversion
Algorithm for Management of Patients With Cirrhosis
Keeffe EB, et al. Clin Gastroenterol Hepatol. 2008;6:1315-1341.
Issues Regarding HBV Treatment of Decompensated Cirrhosis
• Combination therapy vs monotherapy
– Multiple negative clinical consequences including death and need for LT if drug resistance develops
– If using drugs with low genetic barrier to resistance, combination therapy best long-term, otherwise monotherapy is acceptable
• Safety
– Entecavir: monitor for lactic acidosis
– Tenofovir: monitor for renal toxicity (Cr/CrCl, PO4)
Antiviral Therapy in Decompensated Cirrhotics
Summary
• Antiviral therapy indicated for all with concurrent evaluation for LT – Combination therapy recommended to avoid
virological breakthrough with prolonged therapy but this recommendation may be outdated
• Expected time to LT should influence drug choice – Need potent antiviral activity
– No clear advantage of combo if potent antiviral used
Treatment Decisions in HBV-HIV Co-infected Patients
If meets criteria for HIV treatment:
• HBV DNA and ALT levels, HBeAg status have little to no role in decision-making
• Choose regimen that is effective against both HIV and HBV
If HIV does not need treatment:
• Decision to treat based on ALT and HBV DNA levels
• Options:
– Use drugs that have no activity against HIV
– Treat HIV and HBV simultaneously
HBV-HIV Summary
• HBV is dynamic disease - close monitoring needed
• Treat all cirrhotics, even if decompensated
• Always treat HBV if “active”
• Always treat HBV if treating HIV
• Monitor for response and make changes if
suboptimal virologic responses apparent
• ART interruptions: alternatives limited
Hepatitis B Treatment Summary
• HBV is controlled not cured
• Treatment targets individuals with active disease or advanced fibrosis
• Tenofovir, entecavir and peg-IFN are preferred drugs
• Risks-benefits of treatment need to be individualized
• Endpoints of treatment evolving - HBsAg is highly
desirable but infrequently obtained