A Randomized Phase I Study of a Hepatitis B Antigen Combined With IMP321

Healthy Clinical Trial

Official title: A Phase I, Single-Blind Study to Determine the Safety, Tolerability and Pharmacodynamic Profiles of a Hepatitis B Antigen Combined With IMP321 Versus the Hepatitis B Antigen Alone and a Reference Vaccine in Healthy Young Male Volunteers

Status Completed

Clinical Trial Summary

This is a single centre, three single administrations (Days 1, 29 and 57) at increasing doses of IMP321 (3, 10, 30 and 100 µg) in four cohorts of 12 subjects, single blind, randomized study.

Clinical Trial Description

In each cohort, 8 subjects will receive the hepatitis B antigen (10 µg) with IMP321 at one dose, 2 subjects will receive the reference hepatitis B antigen (10 µg) alone with physiological saline and 2 subjects will receive the commercial vaccine Engerix B® (20 µg).

Engerix B® will be administered intramuscularly. The other treatments will be administered subcutaneously.

The four successive cohorts of volunteers will be:

Cohort A:

• 8 subjects treated by hepatitis B antigen (10 µg HbsAg, subtype adw, without alum) with IMP321 (3 µg),

• 2 subjects treated by hepatitis B antigen (10 µg HbsAg, subtype adw, without alum) with physiological saline,

• 2 subjects treated by the commercial hepatitis vaccine Engerix B® (20 µg HBsAg with alum).

If the tolerability of this cohort is acceptable, the following cohort will be done.

Cohort B:

• 8 subjects treated by hepatitis B antigen (10 µg HbsAg, subtype adw, without alum) with IMP321 (10 µg),

• 2 subjects treated by hepatitis B antigen (10 µg HbsAg, subtype adw, without alum) with Physiological saline,

• 2 subjects treated by the commercial hepatitis vaccine Engerix B® (20 µg HBsAg with alum).

If the tolerability of this cohort is acceptable, the following cohort will be done.

Cohort C:

• 8 subjects treated by hepatitis B antigen (10 µg HbsAg, subtype adw, without alum) with IMP321 (30 µg),

• 2 subjects treated by hepatitis B antigen (10 µg HbsAg, subtype adw, without alum) with physiological saline,

• 2 subjects treated by the commercial hepatitis vaccine Engerix B® (20 µg HBsAg with alum).

If the tolerability of this cohort is acceptable, the following cohort will be done.

Cohort D:

• 8 subjects treated by hepatitis B antigen (10 µg HbsAg, subtype adw, without alum) with IMP321 (100 µg),

• 2 subjects treated by hepatitis B antigen (10 µg HbsAg, subtype adw, without alum) with physiological saline

• 2 subjects treated by the commercial hepatitis vaccine Engerix B® (20 µg HBsAg with alum).

Blood samples will be collected on the morning of days 1, 29, 36, 57 and 85 for pharmacodynamic evaluation.

Monitoring for the occurrence of adverse events (AE), changes in physical examination, vital signs (blood pressure, pulse rate, respiration), electrocardiograms (ECG) and clinical laboratory tests (biochemistry, haematology, urinalysis) will be performed before and after each dose of the study drug to assess safety and tolerability. ;

Study Design

Allocation: Randomized, Endpoint Classification: Pharmacokinetics/Dynamics Study, Intervention Model: Parallel Assignment, Masking: Single Blind (Subject), Primary Purpose: Basic Science

Related Conditions & MeSH terms

• Healthy
• Hepatitis B

• NCT number: NCT00354861
• Study type: Interventional
• Source: Immutep S.A.
• Status: Completed
• Phase: Phase 1
• Start date: May 2005
• Completion date: February 2006