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Chronic hepatitis B treatment options are limited. Interferon alfa is a first-line therapy, but lamivudine
Area of Science:
- Hepatology
- Virology
- Pharmacology
Background:
- Chronic hepatitis B (CHB) affects 15-25% of carriers, leading to cirrhosis and liver cancer.
- Spontaneous viral clearance is rare; antiviral treatments are assessed in patients with active viral replication.
- Active replication and liver necrosis are risk factors for CHB progression.
Purpose of the Study:
- To evaluate the efficacy and safety of Interferon alfa and Lamivudine for chronic hepatitis B.
- To compare Interferon alfa monotherapy with Lamivudine treatment.
- To assess combination therapy outcomes in non-responders.
Main Methods:
- Review of clinical trials assessing Interferon alfa and Lamivudine.
- Analysis of short-term and long-term outcomes, including mortality, viral markers, and adverse events.
- Comparison of monotherapy and combination therapy regimens.
Main Results:
- Interferon alfa monotherapy (4-9 months) is the first-line CHB treatment, showing reduced mortality in a 7-year trial.
- Lamivudine demonstrated temporary efficacy, with no short-term advantage over Interferon alfa.
- Combination therapy (Lamivudine + Interferon alfa) yielded unfavorable results in non-responders.
Conclusions:
- Interferon alfa remains the standard first-line CHB treatment despite side effects.
- Lamivudine's long-term effects and resistance potential are unknown; use is restricted to clinical trials.
- Further research is needed to establish optimal treatment strategies for chronic hepatitis B.
Abstract:
(1) Chronic hepatitis B is defined by the persistence of circulating HBs antigen for more than 6 months. Between 15 and 25% of chronic HBV carriers die prematurely of complications (mainly cirrhosis and hepatocellular carcinoma). (2) Patients with chronic hepatitis B rarely clear the virus spontaneously, but viral replication ceases in approximately 10% of patients annually, with disappearance of HBe and viral DNA, and emergence of anti-HBe antibodies. (3) Active viral replication and histologically proven liver necrosis are risk factors for progression to cirrhosis. (4) Antiviral treatments have been assessed only in patients with active viral replication. (5) Interferon alfa has been widely tested in the clinical setting. In one trial, in which patients were followed for 7 years, mortality was lower in the treatment group than in untreated controls. (6) Interferon alfa must be injected, and its administration may be followed by adverse effects such as a 'flu-like syndrome (frequently), psychiatric problems and potentially severe thyroid disorders. (7) Interferon alfa monotherapy for 4-6 months (possibly extended to 8-9 months) remains the first-line treatment for chronic hepatitis B. (8) Lamivudine has documented antiviral efficacy but its effect is only temporary in many patients. In the only trial comparing lamivudine with interferon alfa, lamivudine was no more effective than interferon in the short term (on the basis of serological and histological end points), despite a bias in its favour. Trials of lamivudine + interferon alfa in patients who fail to respond to interferon monotherapy have given unfavourable results. (9) Adverse effects are infrequent on lamivudine, but pharmacovigilance is required to assess potential hepatic and pancreatic effects at the dose used in this indication. (10) The long-term effects of lamivudine are unknown, especially on the risks of cirrhosis, hepatocarcinoma and the selection of resistant mutants. (11) Pending further data, lamivudine should be used only in clinical trials and cohort studies.