A Phase I Study of Modified Vaccinia Virus Ankara (MVA-B) in Healthy Volunteers at Low Risk of HIV Infection

Study Overview
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Brief Summary
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The purpose of this clinical trial is to study a modified pox viral vector considering: HIV subtype B accounts for the most frequent virus strain in Europe and North America, as well as in many parts of the world. This novel vaccinia construct expressing HIV subtype B gag, pol, env and nef antigens is to be studied in humans for the first time.

Official Title
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A Phase I Study of MVA-B in Healthy Volunteers at Low Risk of HIV Infection

Conditions
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HIV Infections

Intervention / Treatment
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* Biological: MVA-B
* Biological: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: male or female age between 18 and 55 years on the day of screening available for follow-up for the duration of the study (52 weeks from screening) able to give written informed consent at low risk of HIV and willing to remain so for the duration of the study low risk of HIV infection defined as: no history of injecting drug use in the previous ten years no gonorrhoea or syphilis in the last six months no high risk partner (e.g. injecting drug use, HIV positive partner) either currently or within the past six months no unprotected anal intercourse in the last six months no unprotected vaginal intercourse outside a relationship with a regular known/presumed HIV negative partner in the last six months willing to undergo a HIV test willing to undergo a genital infection screen if heterosexually active female, using an effective method of contraception with partner (combined oral contraceptive pill; injectable contraceptive; IUCD; consistent record with condoms if using these; physiological or anatomical sterility in self or partner) from 14 days prior to the first vaccination until 4 months after the last, and willing to undergo urine pregnancy tests prior to each vaccination if heterosexually active male, using an effective method of contraception with their partner from the first day of vaccination until 4 months after the last vaccination Exclusion Criteria: positive for hepatitis B surface antigen, hepatitis C antibody, antibody responses to vaccinia or serology indicating active syphilis requiring treatment pregnant or lactating clinically relevant abnormality on history or examination including history of grand-mal epilepsy, severe eczema, immunodeficiency or use of immunosuppressives in preceding 3 months receipt of live attenuated vaccine within 60 days or other vaccine within 14 days of enrolment receipt of blood products or immunoglobin within 4 months of screening participation in another trial of a medicinal product, completed less than 30 days prior to enrolment history of severe local or general reaction to vaccination defined as local: extensive, indurated redness and swelling involving most of the front-lateral thigh or the major circumference of the arm, not resolving within 72 hours general: fever >= 39.5oC within 48 hours; anaphylaxis; bronchospasm; laryngeal HIV 1/2 positive or indeterminate on screening positive for hepatitis B surface antigen, hepatitis C antibody or serology indicating active syphilis requiring treatment grade 1 routine laboratory parameters unlikely to comply with protocol

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 55 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 1<br>MVA HIV-B | Biological: MVA-B<br>* 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<br>|
| Placebo Comparator: 2<br>Placebo | Biological: Placebo<br>* -3 immunisations at week 0, 4 and 16<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Safety: proportion of patients with Grade 3 or above local, systemic or other clinical or laboratory adverse events. Adverse events attributable to discontinuation of the immunisation regimen. Immunogenicity: cellular responses (ELISPOT) |  | Safety: at any point of the study; Immunogenicity:week 6/8, 18/20, and at any point following immunisations | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Proportion of patients with grade 1 and 2 adverse events within 28 days of a vaccination -antibody responses -cellular responses -intracellular cytokine analysis |  | at any point of the study and at week 6 and 18 for intracellular cytokine analysis | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Low risk HIV infection, HIV Seronegativity, HIV Preventive Vaccine