Treatment of Chronic Hepatitis B - AASLD/IDSA Guideline 2025

As of my knowledge cutoff in October 2023, the most recent guidelines for the treatment of chronic hepatitis B (CHB) were published by the American Association for the Study of Liver Diseases (AASLD) and the Infectious Diseases Society of America (IDSA). While I cannot provide details on a "2025 guideline," I can summarize the key recommendations from the most recent guidance available, which may still be relevant in 2025 unless updated guidelines have been released.

### Key Recommendations from the AASLD Guidelines for CHB Management

#### 1. **Phases of Chronic Hepatitis B**

• Chronic hepatitis B is categorized into five disease phases:

1. *Immune-tolerant phase*: High HBV DNA levels, normal ALT, minimal liver damage.

2. *Immune-active phase (HBeAg-positive or HBeAg-negative)*: Elevated ALT, active liver inflammation, and high HBV DNA.

3. *Inactive carrier phase*: Low HBV DNA, normal ALT, minimal liver inflammation.

4. *HBsAg-negative clearance phase*: HBsAg loss with anti-HBs development.

5. *Indeterminate phase*: Patients who do not clearly fit into the above phases.

• Management strategies are tailored to the patient’s disease phase, ALT levels, HBV DNA levels, and liver fibrosis status.

#### 2. **Preferred Antiviral Therapies**

• First-line oral antiviral agents include:
• **Entecavir (ETV)**
• **Tenofovir disoproxil fumarate (TDF)**
• **Tenofovir alafenamide (TAF)**
• These drugs are highly effective and have a high barrier to resistance, making them the preferred choices for long-term HBV suppression.

#### 3. **Treatment for Specific Populations**

• **Immune-Tolerant Phase**:
• Antiviral therapy is recommended for patients over 40 years old or those with significant liver inflammation or fibrosis (≥F2).
• **Indeterminate Phase**:
• Treatment decisions should be individualized for HBeAg-negative patients without cirrhosis who fall into the "grey zone" of unclear disease activity. Shared decision-making is emphasized.
• **Pregnancy**:
• For HBsAg-positive pregnant women with HBV DNA >200,000 IU/mL, initiate TDF or TAF at 28 weeks of gestation to prevent mother-to-child transmission.
• **Breastfeeding**:
• TDF and TAF are considered safe during breastfeeding due to minimal drug transfer into breast milk.

#### 4. **Antiviral Discontinuation**

• Nucleos(t)ide analog (NA) therapy should not be stopped unless HBsAg loss (functional cure) is achieved, as discontinuation otherwise poses a risk of HBV relapse or flare.
• If therapy is discontinued, close monitoring of ALT and HBV DNA levels is required every 1–3 months for the first 6 months, then quarterly for the next year.

#### 5. **Functional Cure**

• The ultimate goal of therapy is achieving HBsAg loss (functional cure). However, this outcome is rare with current therapies and is more commonly achieved with interferon-based treatments than with nucleos(t)ide analogs.

#### 6. **Fibrosis Assessment**

• Non-invasive tools such as transient elastography (FibroScan) and FIB-4 are recommended for evaluating liver fibrosis and determining the need for treatment.

#### 7. **Surveillance for Hepatocellular Carcinoma (HCC)**

• High-risk groups require lifelong HCC surveillance with semiannual ultrasound ± alpha-fetoprotein (AFP) testing. These groups include:
• Patients with cirrhosis.
• Males over 40 years and females over 50 years.
• Patients with a family history of HCC.
• Patients co-infected with HBV and HIV or hepatitis D virus (HDV).

#### 8. **Prevention of HBV Transmission**

• Antiviral therapy should be considered for HBsAg-positive individuals at high risk of transmitting HBV (e.g., healthcare workers, sexual partners).
• Universal HBV vaccination is recommended for all adults aged 19–59 years and all infants.

#### 9. **HBV-HIV and HBV-HDV Coinfection**

• Patients co-infected with HBV and HDV or HIV should undergo regular HCC surveillance regardless of their liver fibrosis status.

#### 10. **Research Gaps and Future Directions**

• The AASLD has identified key research priorities, including:
• Developing better biomarkers for disease activity and treatment response (e.g., HBsAg quantitation, HBcrAg, HBV RNA).
• Exploring new strategies for achieving a functional cure.
• Addressing management of patients in the indeterminate phase.
• Future updates to the guidelines are planned as new therapies and diagnostic tools are approved by the FDA.

#### 11. **Shared Decision-Making**

• Patient preferences, ability to adhere to treatment, and access to therapy should guide decisions on initiating, continuing, or discontinuing treatment.

#### 12. **Alignment with WHO Goals**

• The AASLD supports the World Health Organization’s (WHO) initiative to simplify HBV treatment criteria, but retains phase-based thresholds for high-resource settings.

---

### Conclusion

The AASLD/IDSA guidelines emphasize individualized care, evidence-based recommendations, and shared decision-making in the management of chronic hepatitis B. First-line antiviral therapies (ETV, TDF, TAF) are effective for long-term viral suppression, and treatment strategies are tailored to the patient’s disease phase, age, and comorbidities. Prevention of HBV transmission, including vaccination and antiviral prophylaxis in high-risk populations, remains a cornerstone of public health efforts. Ongoing research and future updates will likely focus on achieving functional cures and improving diagnostic and treatment approaches.

If you are specifically looking for the 2025 guideline, I recommend checking the AASLD or IDSA websites for the latest updates and publications.