Trial of pDNA CMV Vaccine (VCL-CT02) Followed by Towne CMV Vaccine (Towne) Challenge

May 5, 2008 updated by: University of California, San Francisco

Randomized, Phase 1 Trial to Evaluate Safety and CMV-Specific Immune Response to a pDNA CMV Trivalent Vaccine (VCL-CT02) Followed by Towne CMV Vaccine (Towne) Challenge in Healthy, CMV- Seronegative Adults

Objectives of this trial are to:

Evaluate the kinetics and magnitude of the CMV-specific immune response post-Towne challenge (3000 pfu) in healthy CMV-seronegative volunteers who receive VCL CT02 administered (1 mg weekly x 3) 3 months previously compared to randomized controls who do not receive VCL CT02 as measured by:

  1. antibody titers for gB;
  2. T-cell IFN-g ELISPOT;
  3. T-cell proliferation assays for IE1, pp65, and/or gB; and
  4. cytokine and phenotypic flow cytometry responses to pp65, IE1, and/or gB.

Evaluate the safety safety of Towne challenge in healthy CMV-seronegative adult subjects who have previously been immunized with a trivalent pDNA CMV vaccine (VCL-CT02) administered intramuscularly.

Our hypothesis is that the immune response to Towne vaccine 3000 pfu challenge after VLC-CT02 priming will be greater than that after Towne vaccination alone.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

This is a Phase 1, single-center, randomized, open-label trial of the live, attenuated Towne CMV vaccine administered as a "challenge" to healthy, CMV-seronegative, adult subjects who previously receive the CMV immunotherapeutic trivalent pDNA-based vaccine, VCL-CT02, given by intramuscular route at Days 1, 7 and 14 or who receive no VCL-CT02.

Up to 12 healthy, CMV-seronegative subjects will be enrolled. If a subject consents and meets all eligibility criteria, the subject will be randomized to the VCL CT02 (N=6)or control (N=6) groups. VCL CT02-assigned subjects will receive VCL CT02 (1 mg weekly x 3) and then on Day 77 will received Towne vacine (3000 pfu subcutaneously). Control-assigned subjects will receive Towne alone. Safety will be monitored and both antibody to CMV gB and T-cell responses to CMV antigens will be measured at specified intervals for 252 days post Towne challenge.

Study Type

Interventional

Enrollment

16

Phase

  • Phase 1

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

  • United States
    • California
      • San Francisco, California, United States, 94110
        • UCSF Positive Health Program, 995 Potrero, 4th Floor

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

14 years to 41 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • 18 to 45 years of age
  • Normal lab values at study entry
  • Good general health
  • Negative CMV IgG antibody test

Exclusion Criteria:

  • CMV seropositive
  • Recent vaccination(s)
  • Immunodeficiency
  • Vaccination with investigational CMV vaccine(s)
  • Pregnant or breast-feeding

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: Prevention
  • Allocation: Randomized
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

What is the study measuring?

Primary Outcome Measures

Outcome Measure
CMV-specific immune response post-Towne challenge: gB antibody, T-cell IFN-g ELISPOT, T-cell proliferation assays for IE1, pp65, and/or gB, cytokine and phenotypic flow cytometry responses to pp65, IE1, gB.

Secondary Outcome Measures

Outcome Measure
Safety of Towne challenge in subjects who have previously been immunized with a trivalent pDNA CMV vaccine (VCL-CT02).

Collaborators and Investigators

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

Sponsor

University of California, San Francisco

Collaborators

Vical

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

October 1, 2006

Primary Completion (Actual)

February 1, 2008

Study Registration Dates

First Submitted

September 6, 2006

First Submitted That Met QC Criteria

September 7, 2006

First Posted (Estimate)

September 8, 2006

Study Record Updates

Last Update Posted (Estimate)

May 8, 2008

Last Update Submitted That Met QC Criteria

May 5, 2008

Last Verified

October 1, 2006

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • Jacobson VCL CT-02 TC

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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