Evaluating the Safety and Immunogenicity of Env (A,B,C,A/E)/Gag (C) DNA and gp120 (A,B,C,A/E) Protein/GLA-SE HIV Vaccines, Given Individually or Co-administered, in Healthy, HIV-1-Uninfected Adults

HIV Infections Clinical Trial

Official title:

A Phase 1 Clinical Trial to Evaluate the Safety and Immunogenicity of Polyvalent Env (A,B,C,A/E) / Gag (C) DNA and gp120 (A,B,C,A/E) Protein/GLA-SE HIV-1 Vaccines (PDPHV-201401) as a Prime-boost Regimen or Co-administered in Repeated Doses, in Healthy, HIV-1-Uninfected Adult Participants

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03409276
• Other study ID #: HVTN 124
• Secondary ID: 38302
• Status: Completed
• Phase: Phase 1
• Start date: March 16, 2018
• Est. completion date: October 22, 2020

Study information

• Verified date: March 2022
• Source: National Institute of Allergy and Infectious Diseases (NIAID)
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The purpose of this study is to evaluate the safety, tolerability, and immunogenicity of env (A,B,C,A/E)/gag (C) DNA and gp120 (A,B,C,A/E) protein/GLA-SE HIV-1 vaccines (PDPHV-201401) as a prime-boost regimen or co-administered in repeated doses, in healthy, HIV-1-uninfected adults.

Description:

This study will evaluate the safety, tolerability, and immunogenicity of env (A,B,C,A/E)/gag (C) DNA and gp120 (A,B,C,A/E) protein/GLA-SE HIV-1 vaccines (PDPHV-201401) as a prime-boost regimen or co-administered in repeated doses, in healthy, HIV-1-uninfected adults. The study will be conducted in two parts (Part A and Part B). Participants in Part A will be randomly assigned to either Group 1 (Treatment) or Group 1 (Control). Participants in Group 1 (Treatment) will receive the gp120 (A,B,C,A/E) protein vaccine admixed with GLA-SE adjuvant on Day 0 and Month 2. Participants in Group 1 (Control) will receive placebo on Day 0 and Month 2. Researchers will evaluate study data from Part A before enrolling participants in Part B. Participants in Part B will be enrolled in either Groups 2 or 3. Within Group 2, participants will be randomly assigned to either Group 2 (Treatment) or Group 2 (Control). Participants in Group 2 (Treatment) will receive the env (A,B,C,A/E)/gag (C) DNA vaccine and placebo on Day 0 and Months 1 and 3. At Months 6 and 8, participants will receive the gp120 (A,B,C,A/E) protein vaccine admixed with GLA-SE adjuvant and a placebo vaccine. Participants in Group 2 (Control) will receive placebo on Day 0 and Months 1, 3, 6, and 8. Participants in Group 3 will be randomly assigned to either Group 3 (Treatment) or Group 3 (Control). Participants in Group 3 (Treatment) will receive the env (A,B,C,A/E)/gag (C) DNA vaccine and the gp120 (A,B,C,A/E) protein vaccine admixed with GLA-SE adjuvant on Day 0 and Months 1, 3, 6, and 8. Participants in Group 3 (Control) will receive placebo on Day 0 and Months 1, 3, 6, and 8. Study visits for participants in Part A will occur on Day 0, Week 2, and Months 2, 2.5, 5, and 8. Study visits for participants in Part B will occur on Day 0, Week 2, and Months 1, 1.5, 3, 3.5, 6, 6.5, 8, 8 + 1 Week, 8.5, 11, and 14. Visits may include physical examinations, blood and urine collection, HIV testing, risk reduction counseling, and questionnaires. Participants in Part B may also have optional saliva, semen, cervical fluid, rectal fluid, and stool sample collection. Study staff will contact all participants 12 months after the last vaccination for follow-up health monitoring.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 60
• Est. completion date: October 22, 2020
• Est. primary completion date: May 11, 2020
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 50 Years

Eligibility

Inclusion Criteria:

General and Demographic Criteria

• Age of 18 to 50 years
• Access to a participating HIV Vaccine Trials Network (HVTN) clinical research site (CRS) and willingness to be followed for the planned duration of the study
• Ability and willingness to provide informed consent
• Assessment of understanding: volunteer demonstrates understanding of this study; completes a questionnaire prior to first vaccination with verbal demonstration of understanding of all questionnaire items answered incorrectly
• Willing to be contacted 12 months after the last vaccination
• Agrees not to enroll in another study of an investigational research agent
• Good general health as shown by medical history, physical exam, and screening laboratory tests

HIV-Related Criteria:

• Willingness to receive HIV test results
• Willingness to discuss HIV infection risks and amenable to HIV risk reduction counseling.
• Assessed by the clinic staff as being at "low risk" for HIV infection and committed to maintaining behavior consistent with low risk of HIV exposure through the last required protocol clinic visit. Laboratory Inclusion Values Hemogram/Complete Blood Count (CBC)
• Hemoglobin greater than or equal to 11.0 g/dL for volunteers who were born female, greater than or equal to 13.0 g/dL for volunteers who were born male
• White blood cell count equal to 3,300 to 12,000 cells/mm^3
• Total lymphocyte count greater than or equal to 800 cells/mm^3
• Remaining differential either within institutional normal range or with site physician approval
• Platelets equal to 125,000/mm^3 to 450,000/mm^3 Chemistry
• Chemistry panel: Alanine aminotransferase (ALT), aspartate aminotransferase (AST), and alkaline phosphatase less than 1.25 times the institutional upper limit of normal; creatinine less than or equal to institutional upper limit of normal. Virology
• Negative HIV-1 and -2 blood test: US volunteers must have a negative US Food and Drug Administration (FDA)-approved enzyme immunoassay (EIA).
• Negative Hepatitis B surface antigen (HBsAg)
• Negative anti-Hepatitis C virus antibodies (anti-HCV), or negative HCV polymerase chain reaction (PCR) if the anti-HCV is positive Urine
• Normal urine:
• Negative urine glucose, and
• Negative or trace urine protein, and
• Negative or trace urine hemoglobin (if trace hemoglobin is present on dipstick, a microscopic urinalysis with red blood cells levels within institutional normal range). Reproductive Status
• Volunteers who were born female: negative serum or urine beta human chorionic gonadotropin (ß-HCG) pregnancy test performed prior to vaccination on the day of initial vaccination. Persons who are NOT of reproductive potential due to having undergone total hysterectomy or bilateral oophorectomy (verified by medical records), are not required to undergo pregnancy testing.
• Reproductive status: A volunteer who was born female must:
• Agree to consistently use effective contraception (see the protocol for more information) for sexual activity that could lead to pregnancy from at least 21 days prior to enrollment until after the last required protocol clinic visit.

Effective contraception is defined as using the following methods:

• Condoms (male or female) with or without a spermicide,
• Diaphragm or cervical cap with spermicide,
• Intrauterine device (IUD),
• Hormonal contraception, or
• Any other contraceptive method approved by the HVTN 124 Protocol Safety Review Team (PSRT)
• Successful vasectomy in the male partner (considered successful if a volunteer reports that a male partner has [1] documentation of azoospermia by microscopy, or [2] a vasectomy more than 2 years ago with no resultant pregnancy despite sexual activity postvasectomy);
• Or not be of reproductive potential, such as having reached menopause (no menses for 1 year) or having undergone hysterectomy, bilateral oophorectomy, or tubal ligation;
• Or be sexually abstinent.
• Volunteers who were born female must also agree not to seek pregnancy through alternative methods, such as artificial insemination or in vitro fertilization until after the last required protocol clinic visit Exclusion Criteria: General
• Blood products received within 120 days before first vaccination
• Investigational research agents received within 30 days before first vaccination
• Body mass index (BMI) greater than or equal to 40; or BMI greater than or equal to 35 with 2 or more of the following: age greater than 45, systolic blood pressure greater than 140 mm Hg, diastolic blood pressure greater than 90 mm Hg, current smoker, known hyperlipidemia
• Intent to participate in another study of an investigational research agent or any other study that requires non-HVTN HIV antibody testing during the planned duration of the HVTN 124 study
• Pregnant or breastfeeding
• Active duty and reserve US military personnel Vaccines and other Injections
• HIV vaccine(s) received in a prior HIV vaccine trial. For volunteers who have received control/placebo in an HIV vaccine trial, the HVTN 124 PSRT will determine eligibility on a case-by-case basis.
• Non-HIV experimental vaccine(s) received within the last 5 years in a prior vaccine trial. Exceptions may be made by the HVTN 124 PSRT for vaccines that have subsequently undergone licensure by the FDA. For volunteers who have received control/placebo in an experimental vaccine trial, the HVTN 124 PSRT will determine eligibility on a case-by-case basis. For volunteers who have received an experimental vaccine(s) greater than 5 years ago, eligibility for enrollment will be determined by the HVTN 124 PSRT on a case-by-case basis.
• Live attenuated vaccines received within 30 days before first vaccination or scheduled within 14 days after injection (eg, measles, mumps, and rubella [MMR]; oral polio vaccine [OPV]; varicella; yellow fever)
• Any vaccines that are not live attenuated vaccines and were received within 14 days prior to first vaccination (eg, tetanus, pneumococcal, Hepatitis A or B)
• Allergy treatment with antigen injections within 30 days before first vaccination or that are scheduled within 14 days after first vaccination Immune System
• Immunosuppressive medications received within 168 days before first vaccination (Not exclusionary: [1] corticosteroid nasal spray; [2] inhaled corticosteroids; [3] topical corticosteroids for mild, uncomplicated dermatitis; or [4] a single course of oral/parenteral prednisone or equivalent at doses less than 60 mg/day and length of therapy less than 11 days with completion at least 30 days prior to enrollment.)
• Serious adverse reactions to vaccines or to vaccine components including history of anaphylaxis and related symptoms such as hives, respiratory difficulty, angioedema, and/or abdominal pain. (Not excluded from participation: a volunteer who had a nonanaphylactic adverse reaction to pertussis vaccine as a child.)
• Immunoglobulin received within 60 days before first vaccination
• Autoimmune disease, connective tissue disease, or history of vasculitis, e.g., leukocytoclastic vasculitis, Henoch-Schonlein purpura
• Immunodeficiency Clinically significant medical conditions
• Untreated or incompletely treated syphilis infection
• Clinically significant medical condition, physical examination findings, clinically significant abnormal laboratory results, or past medical history with clinically significant implications for current health. A clinically significant condition or

process includes but is not limited to:

• A process that would affect the immune response,
• A process that would require medication that affects the immune response,
• Any contraindication to repeated injections or blood draws,
• A condition that requires active medical intervention or monitoring to avert grave danger to the volunteer's health or well-being during the study period,
• A condition or process for which signs or symptoms could be confused with reactions to vaccine, or
• Any condition specifically listed among the exclusion criteria below.
• Any medical, psychiatric, occupational, or other condition that, in the judgment of the investigator, would interfere with, or serve as a contraindication to, protocol adherence, assessment of safety or reactogenicity, or a volunteer's ability to give informed consent
• Psychiatric condition that precludes compliance with the protocol. Specifically excluded are persons with psychoses within the past 3 years, ongoing risk for suicide, or history of suicide attempt or gesture within the past 3 years.
• Current anti-tuberculosis (TB) prophylaxis or therapy
• Asthma exclusion criteria: Asthma other than mild, well-controlled asthma. (Symptoms of asthma severity as defined in the most recent National Asthma Education and

Prevention Program (NAEPP) Expert Panel report). Exclude a volunteer who:

• Uses a short-acting rescue inhaler (typically a beta 2 agonist) daily, or
• Uses moderate/high dose inhaled corticosteroids, or
• In the past year has either of the following:
• Greater than 1 exacerbation of symptoms treated with oral/parenteral corticosteroids;
• Needed emergency care, urgent care, hospitalization, or intubation for asthma.
• Diabetes mellitus type 1 or type 2, including cases controlled with diet alone. (Not excluded: history of isolated gestational diabetes.)
• Thyroidectomy, or thyroid disease requiring medication during the last 12 months
• Hypertension:
• If a person has been found to have elevated blood pressure or hypertension during screening or previously, exclude for blood pressure that is not well controlled. Well-controlled blood pressure is defined as consistently less than or equal to 140 mm Hg systolic and less than or equal to 90 mm Hg diastolic, with or without medication, with only isolated, brief instances of higher readings, which must be less than or equal to 150 mm Hg systolic and less than or equal to 100 mm Hg diastolic. For these volunteers, blood pressure must be less than or equal to 140 mm Hg systolic and less than or equal to 90 mm Hg diastolic at enrollment.
• If a person has NOT been found to have elevated blood pressure or hypertension during screening or previously, exclude for systolic blood pressure greater than or equal to 150 mm Hg at enrollment or diastolic blood pressure greater than or equal to 100 mm Hg at enrollment.
• Bleeding disorder diagnosed by a doctor (eg, factor deficiency, coagulopathy, or platelet disorder requiring special precautions)
• Malignancy (Not excluded from participation: Volunteer who has had malignancy excised surgically and who, in the investigator's estimation, has a reasonable assurance of sustained cure, or who is unlikely to experience recurrence of malignancy during the period of the study)
• Seizure disorder: History of seizure(s) within past three years. Also exclude if volunteer has used medications in order to prevent or treat seizure(s) at any time within the past 3 years.
• Asplenia: any condition resulting in the absence of a functional spleen
• History of hereditary angioedema, acquired angioedema, or idiopathic angioedema.

Related Conditions & MeSH terms

• HIV Infections

Intervention

Biological:
• env (A,B,C,A/E)/gag (C) DNA Vaccine
Administered by intramuscular injection in the deltoid.
• gp120 (A,B,C,A/E) Protein Vaccine
Administered by intramuscular injection in the deltoid.
• Placebo
Sodium Chloride for Injection, USP 0.9%; Administered by intramuscular injection in the deltoid.
• GLA-SE adjuvant
Administered by intramuscular injection in the deltoid.

Locations

Country	Name	City	State
United States	Alabama CRS	Birmingham	Alabama
United States	Fenway Health (FH) CRS	Boston	Massachusetts
United States	Case Clinical Research Site	Cleveland	Ohio
United States	The Hope Clinic of the Emory Vaccine Center CRS	Decatur	Georgia
United States	Penn Prevention CRS	Philadelphia	Pennsylvania
United States	University of Rochester Vaccines to Prevent HIV Infection CRS	Rochester	New York

Sponsors (1)

Lead Sponsor	Collaborator
National Institute of Allergy and Infectious Diseases (NIAID)

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Number of Participants Reporting Local Reactogenicity Signs and Symptoms	Graded according to the Division of AIDS (DAIDS) Table for Grading the Severity of Adult and Pediatric Adverse Events, Corrected Version 2.1, July 2017. The maximum grade observed for each symptom over the time frame is presented.	Measured through 3 days after participants' each vaccination at Months 0, 2 for part A and Months 0, 1, 3, 6, 8 for part B
Primary	Number of Participants Reporting Systemic Reactogenicity Signs and Symptoms	Graded according to the Division of AIDS (DAIDS) Table for Grading the Severity of Adult and Pediatric Adverse Events, Corrected Version 2.1, July 2017. The maximum grade observed for each symptom over the time frame is presented.	Measured through 3 days after participants' each vaccination at Months 0, 2 for part A and Months 0, 1, 3, 6, 8 for part B
Primary	Number of Participants Reporting Adverse Events (AEs), by Relationship to Study Product	For participants reporting multiple AEs over the time frame, the maximum relationship is counted.	Measured through 30 days after each vaccine dose at Months 0, 2 for part A and Months 0, 1, 3, 6, 8 for part B
Primary	Number of Participants Reporting Adverse Events (AEs), by Severity Grade	For participants reporting multiple AEs over the time frame, the maximum severity grade is counted.	Measured through 30 days after each vaccine dose at Months 0, 2 for part A and Months 0, 1, 3, 6, 8 for part B
Primary	Number of Participants Reporting Serious Adverse Events (SAEs)	Measured as outlined in Version 2.0 (January 2010) of the Manual for Expedited Reporting of Adverse Events to DAIDS (DAIDS EAE Manual).	Measured through Month 8 for part A and Month 14 for part B
Primary	Number of Participants Reporting Adverse Events of Special Interest (AESIs)	Adverse events of special interest were described in Appendix N of the protocol. AESI for this protocol include but are not limited to potential immune-mediated diseases. There were no adverse events of special interest reported by any participant.	Measured through Month 8 for part A and Month 14 for part B
Primary	Numbers of Participants With Grade 1 or Higher Local Laboratory Results	The number (percentage) of participants with local laboratory values recorded as meeting Grade 1 AE criteria or above as specified in the DAIDS AE Grading Table were tabulated by treatment arm for each post-vaccination time point. Laboratory results are summarized by analyte and timepoint. Analytes and timepoint combinations with no grade 1 or higher results are not shown.	Measured during Screening, Day 14, Day 70, Day140 for part A and visits Screening, Day 14, Day 42, Day 98, Day 182, Day 238 and Day 334 for part B
Primary	Alk Phos, AST, ALT in UL	Laboratory results are summarized by analyte and timepoint.	Measured through Screening, Day 14, Day 70, Day140 for part A and visits Screening, Day 14, Day 42, Day 98, Day 182, Day 238 and Day 334 for part B
Primary	Hemoglobin, Creatinine in g/dL	Laboratory results are summarized by analyte and timepoint.	Measured through Screening, Day 14, Day 70, Day140 for part A and visits Screening, Day 14, Day 42, Day 98, Day 182, Day 238 and Day 334 for part B
Primary	WBC, Platelets, Lymphocytes, Neutrophils in Thousand Cells/Cubic mm	Laboratory results are summarized by analyte and timepoint.	Measured through Screening, Day 14, Day 70, Day140 for part A and visits Screening, Day 14, Day 42, Day 98, Day 182, Day 238 and Day 334 for part B
Primary	Number of Participants With Early Discontinuation of Vaccinations and Reason for Discontinuation	From the study product discontinuation form, study product administration reasons are tabulated by treatment arm	Measured through study completion, up to 31 months
Secondary	Occurrence of IgG HIV-1 Env-specific IgG Responses Two Weeks After the Last Vaccination	Serum IgG responses were measured on a Bio-Plex instrument using a standardized custom Luminex assay. The readout is background-subtracted mean fluorescent intensity (MFI), with background adjustment for an antigen-specific plate level control. For each sample, response magnitude is net MFI, defined as experimental antigen MFI minus reference antigen MFI. Net MFI less than 1 is set to 1, and net MFI > 22,000 is set to 22,000. Samples from post-enrollment visits have positive responses if they meet three criteria: (1) net MFI greater than or equal to an antigen-specific response threshold (defined as the maximum of 100 and the 95th percentile of baseline net MFI), (2) net MFI values are greater than 3 times baseline net MFI, and (3) experimental antigen MFI values are greater than 3 times baseline MFI. Data are excluded if blood draw date was outside the allowable window, a participant was HIV-infected, reference antigen > 5,000 MFI, or baseline net MFI > 6,500.	Measured at Month 2.5 for part A and 8.5 for part B
Secondary	Levels of IgG HIV-1 Env-specific IgG Responses Two Weeks After the Last Vaccination	Serum IgG responses were measured on a Bio-Plex instrument using a standardized custom Luminex assay. The readout is background-subtracted mean fluorescent intensity (MFI), with background adjustment for an antigen-specific plate level control. For each sample, response magnitude is net MFI, defined as experimental antigen MFI minus reference antigen MFI. Net MFI less than 1 is set to 1, and net MFI > 22,000 is set to 22,000. Data are excluded if blood draw date was outside the allowable window, a participant was HIV-infected, reference antigen > 5,000 MFI, or baseline net MFI > 6,500. Summary was calculated among positive responders only (positivity criteria are described in Outcome 12).	Measured at Month 2.5 for part A and 8.5 for part B
Secondary	Breadth of IgG HIV-1 Env-specific IgG Responses Two Weeks After the Last Vaccination	Serum IgG responses were measured on a Bio-Plex instrument using a standardized custom Luminex assay. Magnitude-breadth (MB) curves characterized the magnitude (Binding antibody MFI* at 1:50 dilution and titer) and breadth (number of antigens with positive response at given MFI* or titer) of each individual plasma sample assayed against a panel of antigens. The x-axis represents the response magnitude and the y-axis represents the fraction of antigens with response magnitude greater than the x-axis value. In addition to the individual sample specific curves, the group-specific curve displayed the average MB across all participants in that group. The area-under-the-magnitude-breadth curve (AUC-MB) was calculated as the average of the log10 MFI* (log10 titer) over the panel of antigens.	Measured at Month 2.5 for part A and 8.5 for part B
Secondary	Part B: Occurrence of Serum Neutralizing Antibody Responses Against Tier 1A, Tier 1B, and Selected Tier 2 Viruses Two Weeks After the Last Vaccination	Neutralizing antibodies against HIV1were measured as a function of reductions in Tat-regulatedluciferase (Luc) reporter gene expression in TZM-blcells. The assay performed in TZM-bl cells measured neutralization titers against a panel of Env-pseudotyped viruses that exhibit the following naturalization phenotypes. Response to a virus/isolate was considered positive if the neutralization titer was above a prespecified cutoff. A titer was defined as the serum dilution that reduced relative luminescence units (RLUs) by 50% and 80% relative to the RLUs in virus control wells (cells + virus only) after subtraction of background RLU (ID50 and ID80, cells only). The prespecified cutoff was 20 for MW965.26 (Tier 1a) and 10 for other viruses.	Measured at Month 8.5 for part B only
Secondary	Part B: Levels of Serum Neutralizing Antibody Responses Against Tier 1A, Tier 1B, and Selected Tier 2 Viruses Two Weeks After the Last Vaccination	Neutralizing antibodies against HIV1were measured as a function of reductions in Tat-regulatedluciferase (Luc) reporter gene expression in TZM-blcells. The assay performed in TZM-bl cells measured neutralization titers against a panel of Env-pseudotyped viruses that exhibit the following naturalization phenotypes. Response to a virus/isolate was considered positive if the neutralization titer was above a prespecified cutoff. A titer was defined as the serum dilution that reduced relative luminescence units (RLUs) by 50% and 80% relative to the RLUs in virus control wells (cells + virus only) after subtraction of background RLU (ID50 and ID80, cells only). The prespecified cutoff was 20 for MW965.26 (Tier 1a) and 10 for other viruses.	Measured at Month 8.5 for part B only
Secondary	Breadth of gp70-V1V2 IgG and gp120 IgA, Assessed by Binding Antibody Multiplex Assay, and ADCC Activities Against HIV-1 Subtypes A, B, C and A/E Two Weeks After the Last Vaccination in Part B	For Binding Antibody Multiplex Assay, gp70-V1V2 IgG, the area-under-the-magnitude-breadth curve (AUC-MB) was calculated as the average of the log10 MFI* (log10 titer) over the panel of antigens. For ADCC GranToxiLux, AUC-MB was calculated as the average of the AUC over the panel of antigens, where AUC is defined as nonparametric area under the net percent granzyme B activity vs log10 (dilution) curve ("AUC"), calculated using the trapezoidal rule, and setting any net percent granzyme B activity below 0% to 0%. For ADCC Luciferase, (AUC-MB) was calculated as the average of the pAUC over the panel of antigens, where pAUC is defined as nonparametric partial area under the baseline subtracted curves ("pAUC"), calculated using the trapezoidal rule on the first four dilutions of the baseline subtracted curves, setting baseline subtracted loss Luciferase activity less than 0% to zero.	Measured at Month 8.5 for part B only
Secondary	Occurrence of CD4+ T Cell Responses to the HIV Proteins Included in the Vaccine Two Weeks After the Last Vaccination. Measured by Flow Cytometry.	PBMC samples are stimulated with synthetic peptide pools or left unstimulated as a negative control. For each sample, T-cell subset, and peptide pool, response magnitude is % cells expressing markers (IFNg and/or IL-2) after peptide stimulation minus % cells expressing markers after no stimulation. A contingency table is constructed to assess response: stimulation (peptide/none) vs. marker expression (yes/no). A one-sided Fisher's exact test is applied, testing if the number of cells positive for the marker is equal in the stimulated vs. unstimulated cells. A discrete Bonferroni adjustment is made over the peptide pools. Response is positive if adjusted p-value <=0.00001. Please note the above analyses were applied by the lab to determine the response positivity, not the planned analyses for the study outcome measures. Data are excluded if blood draw date was outside the visit window, participant was HIV-infected, PBMC viability or T-cell count were low, or negative control was high.	Measured at Month 8.5 for part B only
Secondary	Level of CD4+ T Cell Responses to the HIV Proteins Included in the Vaccine Two Weeks After the Last Vaccination. Measured by Flow Cytometry.	PBMC samples are stimulated with synthetic peptide pools or left unstimulated as a negative control. For each sample, T-cell subset, and peptide pool, response magnitude is % cells expressing markers (IFNg and/or IL-2) after peptide stimulation minus % cells expressing markers after no stimulation. A contingency table is constructed to assess response: stimulation (peptide/none) vs. marker expression (yes/no). A one-sided Fisher's exact test is applied, testing if the number of cells positive for the marker is equal in the stimulated vs. unstimulated cells. A discrete Bonferroni adjustment is made over the peptide pools. Response is positive if adjusted p-value <=0.00001. Please note the above analyses were applied by the lab to determine the response positivity, not the planned analyses for the study outcome measures. Data are excluded if blood draw date was outside the visit window, participant was HIV-infected, PBMC viability or T-cell count were low, or negative control was high.	Measured at Month 8.5 for part B only
Secondary	Occurrence of CD8+ T Cell Responses to the HIV Proteins Included in the Vaccine Two Weeks After the Last Vaccination. Measured by Flow Cytometry.	PBMC samples are stimulated with synthetic peptide pools or left unstimulated as a negative control. For each sample, T-cell subset, and peptide pool, response magnitude is % cells expressing markers (IFNg and/or IL-2) after peptide stimulation minus % cells expressing markers after no stimulation. A contingency table is constructed to assess response: stimulation (peptide/none) vs. marker expression (yes/no). A one-sided Fisher's exact test is applied, testing if the number of cells positive for the marker is equal in the stimulated vs. unstimulated cells. A discrete Bonferroni adjustment is made over the peptide pools. Response is positive if adjusted p-value <=0.00001. Please note the above analyses were applied by the lab to determine the response positivity, not the planned analyses for the study outcome measures. Data are excluded if blood draw date was outside the visit window, participant was HIV-infected, PBMC viability or T-cell count were low, or negative control was high.	Measured at Month 8.5 for part B only
Secondary	Level of CD8+ T Cell Responses to the HIV Proteins Included in the Vaccine Two Weeks After the Last Vaccination. Measured by Flow Cytometry.	PBMC samples are stimulated with synthetic peptide pools or left unstimulated as a negative control. For each sample, T-cell subset, and peptide pool, response magnitude is % cells expressing markers (IFNg and/or IL-2) after peptide stimulation minus % cells expressing markers after no stimulation. A contingency table is constructed to assess response: stimulation (peptide/none) vs. marker expression (yes/no). A one-sided Fisher's exact test is applied, testing if the number of cells positive for the marker is equal in the stimulated vs. unstimulated cells. A discrete Bonferroni adjustment is made over the peptide pools. Response is positive if adjusted p-value <=0.00001. Please note the above analyses were applied by the lab to determine the response positivity, not the planned analyses for the study outcome measures. Data are excluded if blood draw date was outside the visit window, participant was HIV-infected, PBMC viability or T-cell count were low, or negative control was high.	Measured at Month 8.5 for part B only