Comparison of TAF and TDF in Preventing Mother-to-Child Transmission of HBV in Pregnancies With High Viral Loads

Guangzhou Medical University

Status: Enrolling

Conditions: Hepatitis B

Treatments: Drug: TDF group; Drug: TAF group

Study type: Interventional

Funder types: Other

Identifiers

NCT06947356

US-CN-P818

Details and patient eligibility

About

The main objective of this study is to compare the mother-to-infant transmission rates of hepatitis B between pregnant women receiving treatment with tenofovir alafenamide and those receiving treatment with tenofovir disoproxil fumarate, after administering the hepatitis B vaccine and hepatitis B immunoglobulin to their infants at birth. Investigators define the mother-to-infant transmission rate of hepatitis B as the proportion of infants who are HBsAg positive and have serum HBV DNA >20 IU/mL at 28 weeks of age among all live births in the experimental group.

Additionally, this study will also compare the incidence of congenital defects/malformations in infants born to mothers treated with tenofovir alafenamide and tenofovir disoproxil fumarate during the perinatal period to assess drug safety.

Full description

see summary

Enrollment: 210 estimated patients

Sex: Female

Ages: 20 to 40 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

1. Pregnant women aged between 20 and 40 years old
2. Pregnancy duration between 20 to 28 weeks (screening for eligible patients can start from the 20th week of gestation)
3. Clinically diagnosed with compensated chronic hepatitis B, HBsAg positive for more than 6 months, with clinical history, signs, and test results consistent with compensated chronic hepatitis B
4. HBsAg and HBeAg positive in maternal serum during screening
5. PCR testing shows maternal serum HBV DNA levels exceeding 200,000 IU/mL
6. Subjects voluntarily agree to undergo treatment according to the study design's drug treatment plan and all other research requirements, and patients consent to strictly avoid pregnancy within 28 weeks postpartum
7. Patients and their husbands (the biological parents of the child) understand the risks and voluntarily participate in the study. The mother must participate voluntarily and sign a written informed consent document before participating in the study.

Exclusion criteria

1. Creatinine clearance < 100 mL/min (calculated using the Cockcroft-Gault method based on serum creatinine and ideal body weight), or hypophosphatemia (below normal range).
2. History of adverse renal reactions induced by Adefovir or history of Adefovir resistance.
3. Meeting one of the following criteria: hemoglobin < 80 g/L, neutrophil count < 1000/μL, ALT > 5 times the upper limit of normal, total bilirubin > 20 mg/L, albumin < 25 g/L, abnormal levels of creatinine or urea nitrogen.
4. Pregnant women with a history of miscarriage, history of giving birth to a child with congenital malformations, or history of fetal infection with hepatitis B virus.
5. The biological father of the current pregnancy has chronic hepatitis B.
6. The investigator assesses that the subject has significant kidney, cardiovascular, pulmonary, or neurological diseases that affect their participation in the study.

Trial design

Primary purpose: Prevention

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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210 participants in 2 patient groups

TAF group

Experimental group

Description:

Pregnant women will start TAF treatment (25 mg tablet taken orally once daily) from 28 weeks of gestation until delivery. After that, they will be randomly assigned to two subgroups among postpartum mothers without HBV treatment indications: one subgroup will stop treatment, while the other subgroup will continue with an additional 12 weeks of TAF treatment. The mothers and their infants will be followed up at 28 weeks postpartum. Infants will receive the hepatitis B vaccine and HBIG within 12 hours after birth, as well as booster doses of the hepatitis B vaccine at 4 weeks and 24 weeks.

Treatment:

Drug: TAF group

TDF group

Active Comparator group

Description:

The mother will start receiving TDF treatment (300 mg tablet taken orally once daily) at 28 weeks of pregnancy until delivery. After that, mothers without HBV treatment indications will be randomly assigned to two subgroups: one subgroup will stop treatment, while the other subgroup will receive an additional 12 weeks of TDF treatment. Infants will be vaccinated with the hepatitis B vaccine and HBIG within 12 hours after birth, as well as receive booster doses of the hepatitis B vaccine at 4 weeks and 24 weeks.

Treatment:

Drug: TDF group