A Phase I, Multicenter, Randomized, Double-Blind, Placebo-Controlled HIV-1 Vaccine Trial to Evaluate the Safety and Immunogenicity of Low Dose MN rsgp120/HIV-1 (Genentech) in Combination With QS21 Adjuvant or Alum in Healthy Adults
- Conditions
- HIV Infections
- Registration Number
- NCT00000853
- Brief Summary
To expand the safety information regarding MN rsgp 120/HIV-1 formulated with QS21 or alum. To evaluate the immunogenicity of low doses of MN rsgp 120/HIV-1 formulated with QS21 or alum.
Studies to date indicate that there may be a dose-sparing effect with the use of QS21. In animal studies, when QS21 has been employed as an adjuvant, it shifted both the dose response curve and allowed less antigen to elicit equivalent binding antibody titers to the rgp120 protein. There may also be an acceleration in the course of antibody response after both the first and the second immunizations. Although the final titers in response to vaccine given in both alum and QS21 appear similar after 3 doses in humans, this plateau may be reached more readily, and with a lower antigen dose, when using QS21 as an adjuvant. In addition, it has been established that using a lower dose of antigen may elicit an immune response which is characterized by lymphoproliferation and production of TH1-like cytokines such as INF-gamma, interleukin-2, interleukin-4, interleukin-5 and interleukin-10.
- Detailed Description
Studies to date indicate that there may be a dose-sparing effect with the use of QS21. In animal studies, when QS21 has been employed as an adjuvant, it shifted both the dose response curve and allowed less antigen to elicit equivalent binding antibody titers to the rgp120 protein. There may also be an acceleration in the course of antibody response after both the first and the second immunizations. Although the final titers in response to vaccine given in both alum and QS21 appear similar after 3 doses in humans, this plateau may be reached more readily, and with a lower antigen dose, when using QS21 as an adjuvant. In addition, it has been established that using a lower dose of antigen may elicit an immune response which is characterized by lymphoproliferation and production of TH1-like cytokines such as INF-gamma, interleukin-2, interleukin-4, interleukin-5 and interleukin-10.
Patients will be recruited and screened and those determined as eligible will be enrolled in the study. Initially, 5 patients will be randomized into each combination of MN rsgp 120/HIV-1 dose and adjuvant, QS21 or alum, along with 2 controls for each adjuvant group. An additional 10 patients will be randomized equally between the QS21 and alum arms to the lowest dose group having 2 or more responders defined as an MN Vital Dye neutralization titer greater than or equal to 10 measured at 2 weeks after the second vaccination. 1 additional control will also be randomized to each adjuvant group. If neither dose has 2 or more responders, no additional patients will be enrolled. Patients will receive their randomly assigned injections at months 0, 1 and 6. Patients will be tested for DTH to MN rsgp 120 at 12 months.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 37
Not provided
Not provided
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- Not specified
- Primary Outcome Measures
Name Time Method
- Secondary Outcome Measures
Name Time Method
Trial Locations
- Locations (3)
UAB AVEG
🇺🇸Birmingham, Alabama, United States
Univ. of Rochester AVEG
🇺🇸Rochester, New York, United States
UW - Seattle AVEG
🇺🇸Seattle, Washington, United States