Antiviral Prophylaxis and Infant Vaccination to Prevent Perinatal Hepatitis B Infection

French Public Scientific and Technological Institution (EPST)

Status and phase

Active, not recruiting

Phase 3

Conditions

Hepatitis B

Pregnancy

Treatments

Drug: Anti-HBV antiviral prophylaxis

Study type

Interventional

Funder types

Other

Identifiers

NCT03343431

iTAP-2

Details and patient eligibility

About

Most new hepatitis B virus (HBV) infections are acquired perinatally. In this study, pregnant women with HBsAg and HBeAg will receive tenofovir disoproxil fumarate during the last trimester of pregnancy and for two months following delivery. Their infants will receive hepatitis B (HB) immunization, starting with a first dose soon after birth. We hypothesize that the risk of mother-to-child transmission of HBV will be lower than 2%. The results of the study will help define policy to manage HBV infected pregnant women to prevent perinatal transmission.

Full description

This is a prospective multi-center, multi-country (Thailand and Lao PDR), open-label, single arm clinical trial in HBsAg and HBeAg positive pregnant women (from 28 weeks until one year postpartum) and their infants (until 18 months of age). Pregnant women with HBsAg and HBeAg will receive tenofovir disoproxil fumarate 300 mg once daily from 28 weeks of pregnancy until two months postpartum. Their infants will receive hepatitis B (HB) immunization, starting with the first dose soon after birth.

The study aims to show that substituting maternal antiviral treatment for infant HBIg can be favorably considered in settings where HBIg plus vaccine has been used as well as in settings where only vaccine is used. A significant improvement over the standard HBIg + vaccine strategy would be that adding an antiviral strategy results in less than 2% transmission. A total of 499 women and their infants will be enrolled in public hospitals in Thailand and Lao PDR.

The study will be monitored by a Data and Safety Monitoring Board (DSMB) at least annually.

Enrollment

504 patients

Sex

Female

Ages

18+ years old

Volunteers

No Healthy Volunteers

Inclusion criteria

Pregnancy
Age ≥18 years
Negative HIV antibody test during current pregnancy
Positive HBsAg test during current pregnancy
Positive HBeAg using a rapid test during current pregnancy
Absence of clinical symptoms of liver disease
Gestational age of 28 weeks (+/- 7 days) based on the obstetrician judgment guided by the review of the date of last menstruation period.
Willing and able to provide written informed consent
Agreeing to bring her infants(s) at the planned study visits at one of the study site until the last visit (18 months after birth) and to inform the site investigators if plans to move to another place and not be able to return to the clinic
Understand the need for adequate infant immunization for her infant(s) and accept that blood draws will be performed to determine the infant HBV infection status

Exclusion criteria

Receipt of anti-HBV antivirals at any time during the last 9 months
Known liver cirrhosis or evidence of hepatocellular carcinoma
Creatinine clearance <50 ml/min, calculated using the Cockcroft-Gault formula
Confirmed dipstick proteinuria >1+ (>30 mg/dL) or normoglycemic glycosuria
Evidence of pre-existing fetal anomalies incompatible with life
Any concomitant condition or treatment that, in the view of the clinical site investigator, would contraindicate participation or compromise adherence to treatment and satisfactory follow up in the study.