Hepatitis B reactivation after tenofovir withdrawal in an HIV-infected patient with history of cured hepatitis B virus infection and poor immunological status

Hepatitis B Virus Reactivation after Switch to Cabotegravir/Rilpivirine in Patient with Low Hepatitis B Surface Antibody

A patient in Japan with HIV began antiretroviral therapy because of acute hepatitis B virus (HBV) 15 years ago, with low hepatitis B surface antibody, and experienced breakthrough HBV reactivation 4 months after switching from bictegravir/emtricitabine/tenofovir alafenamide to cabotegravir/rilpivirine. An immune escape mutation, E164V, was identified in the isolated HBV DNA.

Overview of the immunological mechanisms in hepatitis B virus reactivation: Implications for disease progression and management strategies

Hepatitis B virus (HBV) reactivation is a clinically significant challenge in disease management. This review explores the immunological mechanisms underlying HBV reactivation, emphasizing disease progression and management. It delves into host immune responses and reactivation's delicate balance, spanning innate and adaptive immunity. Viral factors' disruption of this balance, as are interactions between viral antigens, immune cells, cytokine networks, and immune checkpoint pathways, are examined. Notably, the roles of T cells, natural killer cells, and antigen-presenting cells are discussed, highlighting their influence on disease progression. HBV reactivation's impact on disease severity, hepatic flares, liver fibrosis progression, and hepatocellular carcinoma is detailed. Management strategies, including anti-viral and immunomodulatory approaches, are critically analyzed. The role of prophylactic anti-viral therapy during immunosuppressive treatments is explored alongside novel immunotherapeutic interventions to restore immune control and prevent reactivation. In conclusion, this comprehensive review furnishes a holistic view of the immunological mechanisms that propel HBV reactivation. With a dedicated focus on understanding its implications for disease progression and the prospects of efficient management strategies, this article contributes significantly to the knowledge base. The more profound insights into the intricate interactions between viral elements and the immune system will inform evidence-based approaches, ultimately enhancing disease management and elevating patient outcomes. The dynamic landscape of management strategies is critically scrutinized, spanning anti-viral and immunomodulatory approaches. The role of prophylactic anti-viral therapy in preventing reactivation during immunosuppressive treatments and the potential of innovative immunotherapeutic interventions to restore immune control and proactively deter reactivation.

Brief Report: Hepatitis B Infection or Reactivation After Switch to 2-Drug Antiretroviral Therapy: A Case Series, Literature Review, and Management Discussion

BACKGROUND

Two-drug antiretroviral therapy (ART) without hepatitis B virus (HBV) activity is prescribed for persons with HIV as simplified or salvage therapy. Although two-drug regimens are not recommended for persons with chronic HBV infection, guidelines do not address their use in those with HBV susceptibility and/or core antibody reactivity. We present a case series of individuals with HBV infection or reactivation following switch to two-drug, non-HBV-active ART.

SETTING

HIV primary care clinics of an academic medical center in New York, NY.

METHODS

Case surveillance was conducted to identify persons with HBV surface antigenemia and viremia following two-drug ART switch. Clinical characteristics and outcomes were ascertained through chart review.

RESULTS

Four individuals with HBV infection or reactivation after ART switch were identified. Two had HBV susceptibility, 1 had core antibody reactivity, and 1 had surface antigen reactivity preswitch. All eligible persons had received HBV vaccination: 2 with low-level antibody response and 1 with persistent nonresponse. Two presented with fulminant hepatitis, with 1 required liver transplantation.

CONCLUSION

Two-drug ART switch may pose risk of HBV infection or reactivation. We propose careful patient selection and monitoring through the following: (1) assessment of HBV serologies before switch and periodically thereafter, (2) vaccination and confirmation of immunity before switch, (3) risk stratification and counseling about HBV reactivation for those with core antibody, (4) preemptive HBV DNA monitoring for those at the risk of reactivation, (5) continuation of HBV-active prophylaxis when above measures are not feasible, and (6) continuation of HBV-active therapy and surveillance for chronic HBV infection.

Case report: An occult hepatitis B virus infection reactivation in an HIV/HCV coinfected patient during an immune reconstitution inflammatory syndrome

The natural history of occult hepatitis B virus infection (OBI) and the mechanism involved in HBV reactivation are only partially understood. As regards people living with HIV (PLWH), HBV reactivation is estimated to occur with an incidence ratio of 0.019 cases per 100 person-year. Here we report the case of OBI reactivation in a HIV/HCV co-infected patient followed for 25 years at our Infectious Diseases Unit, but, unfortunately, lost to follow-up about 19 months after Direct-acting antivirals (DAAs) treatment. At re-engagement, blood tests showed high replication of plasmatic HIV-RNA along with severe immunosuppression and normal levels of liver enzymes. However, 3 months after ART reintroduction, an immune reconstitution inflammatory syndrome (IRIS) was diagnosed with high detectable HBV-DNA load and transaminase elevation. Our case report shows how the balance between the virus and the host immune system is quite a dynamic process that might significantly impact the course of the disease. The aim of this case report is to bring to the attention of physicians that, although OBI reactivation is a rather rare occurrence, even amongst PLWH, its potential consequences compel to a high alertness on the matter. Therefore, especially in patients with an impaired immune system and on a tenofovir or lamivudine-sparing regimen, HBV serological and virological markers should always be strictly monitored, even in the absence of a hepatitis flare.