Study of the HIV gp120/NefTat/AS02A Vaccine to Treat Individuals With Chronic HIV-1 Infection on Highly Active Antiretroviral Therapy (HAART)

Inclusion Criteria: The study will include subjects who meet all of the following criteria: Male or female, between 18 to 60 years of age at the time of the first vaccination Informed consent signed prior to all study procedures No evidence of acute HIV seroconversion in the 12 months prior to the initiation of antiretroviral therapy Receiving a potent antiretroviral drug regimen for a minimum of 12 consecutive months prior to screening with no interruption of therapy for > 2 weeks. A potent antiretroviral drug regimen is defined as any of the following: *two nucleoside reverse transcriptase inhibitors with either a protease inhibitor or a non-nucleoside reverse transcriptase inhibitor; *a boosted protease inhibitor with either one or two nucleoside reverse transcriptase inhibitors or a non-nucleoside reverse transcriptase inhibitor. Documented suppressed HIV-1 RNA. Subjects must have plasma HIV-1 RNA values <50 copies/ml on at least two measurements during the 6 months prior to the study entry. CD4+ T cell count >400 cells/mm3 within 45 days of the first vaccination CD4 count >200 cells/mm3 at all times Laboratory values within 45 days prior to the first vaccination that meet the following criteria: Hemoglobin >9.0 g/dL; Absolute neutrophil count ≥ 1000/mm3; Platelet count ≥ 75,000/mm3; Prothrombin time (PT) < 1.2 x upper limit of normal (ULN) and partial thromboplastin time (PTT) < 1.5 x ULN; Total serum creatinine < 1.3 x ULN; Total serum bilirubin < 2.0 x ULN; Alkaline phosphatase, AST (SGOT) and ALT (SGPT) < 1.5 x ULN. Negative serologic test for HBsAg Negative serologic test for antibodies to HCV or negative HCV PCR if anti-HCV antibodies are positive. Female patient of childbearing potential must: Have a negative urine pregnancy test (sensitive to 25 IU HCG) immediately prior to vaccination; Have no intention of conceiving during the entire study period; Agree to use an effective method of birth control during the entire study period. Effective methods of birth control include: Condoms (male or female) with or without spermicidal agent. Condoms are recommended because their appropriate use is the only contraception method effective for preventing HIV transmission; Diaphragm or cervical cap with spermicide; Intrauterine device (IUD). An IUD is an adequate method of birth control, but increases the risk of pelvic inflammatory disease; An FDA-approved oral contraceptive, provided there is no interaction with the woman's current antiretroviral therapy or other medications; If participating in sexual activity that could lead to pregnancy, the male subject or his partner must also use contraception. Exclusion Criteria: HIV-1 RNA > 50 copies/mL within 6 months of screening. Received antiretroviral therapy within 12 months of known HIV-1 seroconversion. History of clinically significant cardiac, pulmonary, gastrointestinal, hepatic, renal, pancreatic, or neurological disease Recent (<24 hours) febrile illness on the day of vaccination (temperature >101 degrees F, oral) History of CD4 count <200 cells/mm3. Female subject who is pregnant or nursing a child Received any immune globulin or blood products within 3 months prior to vaccination or plans to receive such products during the study Received any live vaccine within 30 days prior to study vaccination or any inactivated vaccine within 14 days prior to study vaccination Previously participated in any HIV vaccine clinical trial (unless it is documented that the subject received only placebo) History of any AIDS defining illness Any change in antiretroviral drug regimen within 12 weeks prior to screening Use of any immunomodulatory agents within 30 days prior to study enrollment or planned use during the trial Active drug or alcohol use or dependence that, in the opinion of the sponsor, would interfere with adherence to study requirements. Any condition or history of illness which, in the opinion of the investigator, might interfere with the evaluation of the study objectives Subject has a history of anaphylaxis to any vaccine Subject has a history of allergy to any adjuvant component Subject is taking any of the following medications: systemic steroids (inhaled or nasal steroid therapy is permitted), interleukins, systemic interferons (e.g. local injection of interferon alpha for treatment of HPV is permitted) or systemic chemotherapy