Immunogenicity of Booster Hepatitis B Vaccines in Children After Liver Transplantation

December 4, 2012 updated by: National Taiwan University Hospital

Aim/Background: This study aims to investigate the necessity and efficacy of a hepatitis B virus (HBV) vaccine booster in children after liver transplantation. A universal mass vaccination program of HBV was launched for 20 years in Taiwan. The coverage rate is high and the effect is great. The carrier rate of the population under vaccine coverage decreased from 10-15% to < 1%. In Taiwan, most children who receive organ transplantation were vaccinated with HBV vaccine in infancy and well before the transplantation procedure. This vaccination background information on Taiwanese children is quite unique and not similar to the other countries in the world. The antibody generated by the vaccine usually wanes after a certain period even in normal subjects, let alone in subjects who receive organ transplantation and immunosuppressive agents after transplantation. At present, Taiwan is still an HBV hyperendemic area and the risk of exposure to HBV cannot be overlooked. Should children be given a booster dose of HBV vaccine after transplantation? And how about the immunogenicity of this booster dose in these immunocompromised hosts? If these children cannot obtain an adequate antibody titer, will the risk of HBV infection increase? This study is designed to answer these questions. As a pediatric hepatologist, the author's routine work is to take care of children who underwent liver transplantation. To take advantage of this, the investigators decided to study the efficacy and necessity of HBV booster vaccine in these patients. However, the results of this study should be able to be applied to any kind of solid organ transplanted patients.

Method: The anti-hepatitis B surface antigen (HBs) titer will be checked in patients who received liver transplantation > 1 year ago. If the titer is < 10 IU/L, a booster dose will be administered. The humoral (anti-HBs) and cellular immunity (by ELISPOT to assay T and B cell specific proliferation) and cytokine assay will be done in these patients before and after the booster dose. A three-year follow-up will be performed to monitor the HBV infection in these patients.

Expected Results: The investigators expect for those who survive one year more after liver transplantation to yield a relatively good response to HBV booster under adequate immunosuppression.

Study Overview

Status

Unknown

Conditions

Intervention / Treatment

Detailed Description

The anti-HBs titer will be checked in the patients who received liver transplantation for > 1 year. If the titer is < 10 IU/L, a booster dose will be administered. The humoral (anti-HBs) and cellular immunity (by ELISPOT to assay T and B cell specific proliferation) and cytokine assay will be done in these patients before and after the booster dose. A three-year follow-up will be performed to monitor the HBV infection in these patients.

Study Type

Interventional

Enrollment (Anticipated)

31

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Taiwan
      • Taipei, Taiwan
        • Recruiting
        • National Taiwan University Hospital
        • Contact:
          • Yen H Ni, MD, PhD
          • Phone Number: 5451 23123456

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • Children who received liver transplantation > 1 year ago

Exclusion Criteria:

  • Are now in an unstable condition

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Diagnostic
  • Allocation: Non-Randomized
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: booster
no antibody and boosted
Biological: HBV vaccine booster

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Persistence of anti-HBs in those primarily vaccinated and who underwent liver transplantation
Time Frame: 1 year
antibody(+)
1 year

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
The necessity of a booster dose of HBV vaccine for those primarily vaccinated and who underwent liver transplantation
Time Frame: 1 year
if no antibody , booster
1 year

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

National Taiwan University Hospital

Collaborators

National Science Council, Taiwan

Investigators

  • Principal Investigator: Yen H Ni, MD, PhD, NTUH

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

September 1, 2005

Primary Completion (Actual)

December 1, 2006

Study Completion (Anticipated)

December 1, 2012

Study Registration Dates

First Submitted

September 5, 2005

First Submitted That Met QC Criteria

September 5, 2005

First Posted (Estimate)

September 7, 2005

Study Record Updates

Last Update Posted (Estimate)

December 6, 2012

Last Update Submitted That Met QC Criteria

December 4, 2012

Last Verified

December 1, 2012

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 931205

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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