HIV Infection
Conditions
Keywords
HIV Seronegativity, HIV Preventive Vaccine
Brief summary
30 treated chronic HIV-1 infected patients with CD4+ cell counts above 450 cells/ mm3 will be randomized 1:2 to receive placebo (n=10) or vaccine (n=20) at week 0, 4 and 16 and will be observed at the Investigation Unit of the study site for one hour following vaccination. At week 24 they will stop their HAART until the end of the study.
Interventions
DRUGVaccination
* Modified Pox virus, strain MVA clade -B (expressing HIV-1 Bx08gp120 and IIIB gagpolnef) -\ 1 x 10e8 pfu/ml * 3 immunisations at week 0, 4 and 16
DRUGPlacebo
3 immunisations at week 0, 4 and 16
Sponsors
Hospital Clinic of Barcelona
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* Patient is ≥ 18 years of age; * Voluntarily signed informed consent; * Patient is male, or female with negative pregnancy test prior to enrolment; * Patient has a proven HIV-1 infection (with positive antibodies against HIV-1 and a detectable plasma HIV-1 RNA); * Patient must be on stable treatment with HAART for at least 6 months (HAART is defined as an antiretroviral regimen consisting of at least three registered antiretroviral agents\*); * Mean of all measured CD4+ cell counts during the 6 months prior to the start of HAART must be above or equal to 200 cells/ mm3 * Current CD4+ cell count must be at least 450 cells/ mm3; * HIV-RNA must be below 50 copies/ mL for the last 6 months prior to inclusion, during at least two measurements (occasional so called 'blips' up to 50 copies/mL are permitted); * Patient is one of the following: not sexually active, or a heterosexually active female, agreeing to use condoms with her partner from 14 days prior to the first vaccination until 4 months after the last, even though using another method of contraception, and willing to undergo pregnancy tests during screening and prior to each vaccination, or a male, agreeing to use condoms with his partner from the day of the first vaccination until 4 months after the last vaccination.
Exclusion criteria
* Treatment with a non-HAART regimen of antiretroviral agents prior to the start of HAART; * History of a CDC class C event (see Appendix); * Interruption of HAART during the course of the study which is expected at the time of inclusion; * History of exposure \<20 years ago to any poxvirus based vaccine; * Patient is female and has a positive pregnancy test or the wish of pregnancy: * Active opportunistic infection, or any active infection or malignancy within 30 days prior to screening visit; * Therapy with immunomodulatory agents, including cytokines (e.g. IL2) and gamma globulin, or cytostatic chemotherapy within 90 days prior to screening visit; * History of allergy to any vaccine component; * Use of anti-coagulant medication; * Use of any investigational drug during the 90 days prior to study entry; * Previous failure to antiretroviral and/or mutations conferring genotypic resistance to antiretroviral therapy * Any other condition which, in the opinion
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| primary safety parameters | week 8 | Grade 3 or above local adverse event (pain, cutaneous reactions including induration) Grade 3 or above systemic adverse event (temperature, chills, headache, nausea, vomiting, malaise, and myalgia) Grade 3 or above other clinical or laboratory adverse event confirmed at examination or on repeat testing respectively Any event attributable to vaccine leading to discontinuation of the immunisation regimen |
| Primary immunogenicity parameters | After each inmunisation and at weeks 6-8 and 18-20 | Cellular responses - CD8/CD4+ T cell responses (ELISPOT) |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| All grade 1 and 2 adverse events | week 8 | — |
| Viral load rebound | week 48 | After HAART interruption compared between both arms and with baseline viral load before any medication in each arm |
| Antibody responses | 48 weeks | * binding titration to the construct MVAB * binding titration to and neutralisation of vaccinia |
| Cellular responses | Week 6 and 18 | Intracellular cytokine analysis |
Countries
Spain
Outcome results
None listed