A Safety and Immune Response Study of 2 Experimental HIV Vaccines

HIV Infection Clinical Trial

Official title:

A Phase 1-2 Randomized, Double-blind, Placebo-controlled Clinical Trial of Clade C ALVAC-HIV (vCP2438) and Bivalent Subtype C gp120/MF59® in HIV-uninfected Adults at Low Risk of HIV Infection

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT02404311
• Other study ID #: HVTN 100
• Status: Completed
• Phase: Phase 1/Phase 2
• Start date: February 2, 2015
• Est. completion date: August 7, 2018

Study information

• Verified date: July 2020
• Source: National Institute of Allergy and Infectious Diseases (NIAID)
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The HIV Vaccine Trials Network (HVTN) is doing a study to test a new HIV vaccine combination. HIV is the virus that causes AIDS.

252 people are taking part in this study at multiple sites. The US National Institutes of Health (NIH) is paying for the study.

The investigators are doing this study to answer several questions.

• Are the study vaccines safe to give to people?

• Are people able to take the study vaccines without becoming too uncomfortable?

• How do people's immune systems respond to the study vaccines? (Your immune system protects you from disease.)

Description:

The HIV Vaccine Trials Network (HVTN) is doing a study to test a new HIV vaccine combination. HIV is the virus that causes AIDS. The investigators are doing this study to answer several questions:

• Are the study vaccines safe to give to people?

• Are people able to take the study vaccines without becoming too uncomfortable?

• How do people's immune systems respond to the study vaccines? (Your immune system protects you from disease.)

The study uses 2 different vaccines: ALVAC-HIV (vCP2438) and bivalent gp120/MF59. These are experimental HIV vaccines -- the investigators do not know whether the vaccines will be safe to use in people, or whether they will work to prevent HIV infection. These vaccines are used only in research studies.

The ALVAC vaccine is made out of canarypox virus, which infects birds but cannot grow in human cells. This virus has small bits of man-made DNA inserted into it. DNA is a natural substance found in all living things, including people and some viruses. The canarypox virus helps get the DNA into the body's cells. The DNA then tells those cells to make small amounts of proteins that look like some of the ones found in HIV.

A study in South Africa, HVTN 097, gave a similar ALVAC vaccine to about 80 participants. So far, no one has had serious health problems.

The Protein vaccine has man-made pieces of a protein found on the outside of HIV. These protein pieces are mixed with an adjuvant called MF59. An adjuvant is something added to the vaccine to help the immune system respond better. MF59 has been included with other vaccines that have been given to over 50,000 people in clinical trials without causing any serious health problems.

This combination of study vaccines has not been given to people before. However, similar ALVAC and protein vaccines have been given to more than 10,000 people in clinical trials without causing any serious health problems. Also, over 300 people have received a similar combination of ALVAC and protein vaccines with the MF59 adjuvant in clinical trials without having any serious health problems.

The study is in 2 parts, Part A and Part B. Part B continues the study in order to learn how well boosting the study vaccines improves immune responses. 252 people took part in Part A of this study at multiple sites. Those who continue to meet eligibility requirements are invited to continue in Part B.

The US National Institutes of Health (NIH) is paying for the study. For people who continue to Part B, the study requires about 23 clinic visits in 4 years.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 252
• Est. completion date: August 7, 2018
• Est. primary completion date: August 7, 2018
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 40 Years

Eligibility

Inclusion Criteria:

• Age of 18 to 40 years

• Access to a participating HVTN 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

• 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

• 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 (per Low Risk Guidelines for South African sites) and committed to maintaining behavior consistent with low risk of HIV exposure through the last required protocol clinic visit

• Hemoglobin = 11.0 g/dL for volunteers who were born female, = 13.0 g/dL for volunteers who were born male

• WBC = 3,300 to 12,000 cells/mm3

• Total lymphocyte count = 800 cells/mm3

• Remaining differential either within institutional normal range or with site physician approval

• Platelets = 125,000 to 550,000/mm3

• Chemistry panel: ALT, AST, and ALP < 1.25 times the institutional upper limit of normal; creatinine = institutional upper limit of normal.

• Negative HIV-1 and -2 blood test: Sites may use locally available assays that have been approved by HVTN Laboratory Operations.

• 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

• 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).

• Volunteers who were born female: negative urine beta human chorionic gonadotropin (ß-HCG) pregnancy test performed prior to vaccination on the day of initial vaccination or negative serum beta human chorionic gonadotropin (ß-HCG) pregnancy test within 24 hours prior to initial vaccination. Persons who are NOT of reproductive potential due to having undergone total hysterectomy with 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 for sexual activity that could lead to pregnancy from at least 21 days prior to enrollment through the last required protocol clinic visit. Effective contraception for participants in South Africa is defined as using 2 methods, including the following:

• Condoms (male or female), or

• Diaphragm or cervical cap,

PLUS 1 of the following methods:

• Intrauterine device (IUD),

• Hormonal contraception (in accordance with Republic of South Africa: National Contraception Clinical Guidelines),

• 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

• Any other contraceptive method approved by the HVTN 100 PSRT

• 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:

• Blood products received within 120 days before first vaccination

• Investigational research agents received within 30 days before first vaccination

• Body mass index (BMI) = 40; or BMI = 35 with 2 or more of the following: systolic blood pressure > 140 mm Hg, diastolic blood pressure > 90 mm Hg, current smoker, known hyperlipidemia

• Intent to participate in another study of an investigational research agent or any study that includes HIV testing during the planned duration of the HVTN 100 study

• Pregnant, breastfeeding, or lactating

• HIV vaccine(s) received in a prior HIV vaccine trial. For volunteers who have received control/placebo in an HIV vaccine trial, the HVTN 100 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 for vaccines that have subsequently undergone licensure by the South Africa Medicines Control Council (MCC). For volunteers who have received control/placebo in an experimental vaccine trial, the HVTN 100 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 100 PSRT on a case-by-case basis.

• Live attenuated vaccines other than influenza vaccine 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)

• Influenza vaccine or 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

• Immunosuppressive medications received within 168 days before first vaccination. (Not excluded from participation: [1] corticosteroid nasal spray; [2] inhaled corticosteroids; [3] topical corticosteroids for mild, uncomplicated dermatitis; or [4] a single course of oral/parenteral corticosteroids at doses < 2 mg/kg/day and length of therapy < 11 days with completion at least 30 days prior to enrollment.)

• Serious adverse reactions to vaccines or to vaccine components such as eggs, egg products, or neomycin, 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

• Immunodeficiency

• 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 other than mild or moderate, 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 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 = 140 mm Hg systolic and = 90 mm Hg diastolic, with or without medication, with only isolated, brief instances of higher readings, which must be = 150 mm Hg systolic and = 100 mm Hg diastolic. For these volunteers, blood pressure must be = 140 mm Hg systolic and = 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 = 150 mm Hg at enrollment or diastolic blood pressure = 100 mm Hg at enrollment.

• Bleeding disorder diagnosed by a doctor (eg, factor deficiency, coagulopathy, or platelet disorder requiring special precautions)

• Malignancy (Not excluded: 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

• Acquired Immunodeficiency Syndrome
• HIV Infection
• HIV Infections
• Infections

Intervention

Biological:
• ALVAC-HIV
a lyophilized vaccine for injection at a viral titer = 1 × 10E6 cell culture infectious dose (CCID)50 and < 1 × 10E8 CCID50 (nominal dose of 10E7 CCID50) and is reconstituted with 1mL of sterile sodium chloride solution (NaCl 0.4%) for intramuscular (IM) injection as a single dose.
• Bivalent Subtype C gp120/MF59®
2 recombinant monomeric proteins, each at a dose of 100 mcg, mixed with MF59® adjuvant (an oil-in-water emulsion) delivered as a 0.5 mL IM injection
• ALVAC-HIV (vCP2438) Placebo
a sterile, lyophilized product that consists of a mixture of virus stabilizer, and freeze drying medium and is reconstituted with 1mL of sterile sodium chloride solution (NaCl 0.4%) for injection as a single dose IM
• Bivalent gp120/MF59® Placebo
Sodium chloride for injection, 0,9% delivered as a 0.5 mL IM injection

Locations

Country	Name	City	State
South Africa	Emavundleni Desmond Tutu HIV Centre CRS	Cape Town	Western Cape
South Africa	CAPRISA eThekwini CRS	Durban	KwaZulu-Natal
South Africa	Isipingo CRS	Durban	KwaZulu-Natal
South Africa	Aurum Institute for Health Research	Klerksdorp
South Africa	Perinatal HIV Research Unit	Soweto

Sponsors (6)

Lead Sponsor	Collaborator
National Institute of Allergy and Infectious Diseases (NIAID)	Bill and Melinda Gates Foundation, GlaxoSmithKline, HIV Vaccine Trials Network, Medical Research Council, Sanofi Pasteur, a Sanofi Company

Country where clinical trial is conducted

South Africa, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Part A: Number of Participants Reporting Local Reactogenicity Signs and Symptoms During the Primary Vaccine Regimen	Graded according to the Division of AIDS (DAIDS) Table for Grading the Severity of Adult and Pediatric Adverse Events, Version 2.1 [March 2017] The maximum grade observed for each symptom over the time frame is presented.	Measured through 3 days after participants' last vaccination at Month 0,1,3, and 6
Primary	Part A: Number of Participants Reporting Systemic Reactogenicity Signs and Symptoms During the Primary Vaccine Regimen	Graded according to the Division of AIDS (DAIDS) Table for Grading the Severity of Adult and Pediatric Adverse Events, Version 2.1 [March 2017]	Measured through 3 days after each vaccination at Month 0, 1, 3, and 6
Primary	Part A: Number of Participants With Early Study Termination Associated With an AE or Reactogenicity	From the study termination form, early termination reasons associated with an AE or reactogenicity are tabulated by treatment arm	Measured through Month 18
Primary	Part A: Number of Participants With Study Product Discontinuation Associated With an AE or Reactogenicity	From the study product discontinuation form, study product administration reasons are tabulated by treatment arm	Measured through the Month 12 vaccination
Primary	Part A: Chemistry and Hematology Laboratory Results With Grade 1 or Higher	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 for part A, and 2 weeks after each vaccination at Month 0, 1, 3, 6, and 12
Primary	Part A Chemistry Laboratory Measures: Alkaline Phosphatase, AST, and ALT	For each chemistry laboratory measure, summary statistics were presented by analyte and treatment group for the overall population.	Time Frame: Measured during screening for part A, and 2 weeks after each vaccination at Month 0, 1, 3, 6, and 12
Primary	Part A Chemistry Laboratory Measures: Hemoglobin, Creatinine	For each chemistry laboratory measure, summary statistics were presented by analyte and treatment group for the overall population.	Time Frame: Measured during screening for part A, and 2 weeks after each vaccination at Month 0, 1, 3, 6, and 12
Primary	Part A Hematology Laboratory Measures: WBC, Platelets, Lymphocytes, Neutrophils	For each chemistry laboratory measure, summary statistics were presented by analyte and treatment group for the overall population.	Measured during screening for part A, and 2 weeks after each vaccination at Month 0, 1, 3, 6, and 12
Primary	Part A: Occurrence of IgG Ab Binding to gp120 Env Proteins Contained in the Vaccine (ZM96, TV1.C, 1086.C) After the Primary Vaccine Regimen, Measured by HIV-1 Multiplex Antibody Assay	Serum HIV-1-specific 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. Samples from post-enrollment visits have positive responses if they meet three conditions: (1) net MFI greater than or equal to an antigen-specific response threshold (defined as the maximum of 100 and the 95th percentile of pre-vaccination net MFI), (2) net MFI values are greater than 3 times pre-vaccination net MFI, and (3) experimental antigen MFI values are greater than 3 times pre-vaccination MFI. Data are excluded if the blood draw date was outside the allowable window, a participant was HIV-infected, or the reference antigen exceeds 5000 MFI.	Measured at Month 6.5
Primary	Part A: Level of IgG Ab Binding to gp120 Env Proteins Contained in the Vaccine (ZM96, TV1.C, 1086.C) After the Primary Vaccine Regimen, Measured by HIV-1 Multiplex Antibody Assay	Serum HIV-1-specific 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. The measure unit fluorescence units are relative to assay background, not relative to the placebo arm. Background is used here rather than negative control stimulation, since the antigens are used as bead coating rather than stimulation.	Measured at Month 6.5
Primary	Part A: Occurrence of IgG Binding Antibodies to 3 V1V2-scaffolded Env Proteins After the Primary Vaccine Regimen	Measured by HIV-1 multiplex Ab assay: refer to earlier description for assay methods and analysis variable derivation. The number and percentage of participants with positive responses are summarized by antigen.	Measured at Month 6.5
Primary	Part A: Level of IgG Binding Antibodies to 3 V1V2-scaffolded Env Proteins After the Primary Vaccine Regimen	Serum HIV-1-specific 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. The measure unit fluorescence units are relative to assay background, not relative to the placebo arm. Background is used here rather than negative control stimulation, since the antigens are used as bead coating rather than stimulation.	Measured at Month 6.5
Primary	Part A: Occurrence of CD4+ T Cell Responses to the HIV Proteins Included in the Vaccine After the Primary Vaccine Regimen. 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 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 p<=0.00001. Data are excluded if the blood draw date was outside the visit window, the participant was HIV-infected, PBMC viability or T-cell count were low, or negative control was high.	Measured at Month 6.5
Primary	Part A: Level of CD4+ T Cell Responses to the HIV Proteins Included in the Vaccine After the Primary Vaccine Regimen.	Measured by flow cytometry ICS assay: refer to earlier description for assay methods and analysis variable derivation. Percentage of T-cells expressing cytokines are summarized for positive responders only.	Measured at Month 6.5
Primary	Part B: Number of Participants Reporting Local Reactogenicity Signs and Symptoms in the Extension Study	Graded according to the Division of AIDS (DAIDS) Table for Grading the Severity of Adult and Pediatric Adverse Events, Version 2.1 [March 2017]. For each participant, the maximum grade observed for each symptom over the time frame is presented.	Measured through 3 days after the Month 30 vaccination
Primary	Part B: Number of Participants Reporting Systemic Reactogenicity Signs and Symptoms in the Extension Study	Graded according to the Division of AIDS (DAIDS) Table for Grading the Severity of Adult and Pediatric Adverse Events, Version 2.1 [March 2017]. For each participant, the maximum grade observed for each symptom over the time frame is presented.	Measured through 3 days after the Month 30 vaccination
Primary	Part B: Number of Participants With Early Study Termination Associated With an AE or Reactogenicity	From the study termination form, early termination reasons associated with an AE are tabulated by treatment arm	Measured through Month 36
Primary	Part B: Chemistry and Hematology Laboratory Results of Grade 1 or Higher	Laboratory results are summarized by analyte and timepoint. Analytes and timepoint combinations with no grade 1 or higher results are not shown.	Time Frame: Measured during screening for part B, and 2 weeks after vaccination at Month 30
Primary	Part B Chemistry Laboratory Measures: Alkaline Phosphatase, AST, and ALT	For each chemistry laboratory measure, summary statistics were presented by analyte and treatment group for the overall population.	Measured during screening for part B, and 2 weeks after vaccination at Month 30
Primary	Part B Chemistry Laboratory Measures: Hemoglobin, Creatinine	For each chemistry laboratory measure, summary statistics were presented by analyte and treatment group for the overall population.	Measured during screening for part B, and 2 weeks after vaccination at Month 30
Primary	Part B Chemistry Laboratory Measures: WBC, Platelets, Lymphocytes, Neutrophils	For each chemistry laboratory measure, summary statistics were presented by analyte and treatment group for the overall population.	Measured during screening for part B, and 2 weeks after vaccination at Month 30
Primary	Part B: Occurrence of IgG Binding Antibodies to 3 V1V2-scaffolded Env Proteins in the Extension Study	Measured by HIV-1 multiplex Ab assay: refer to earlier description for assay methods and analysis variable derivation. The number and percentage of participants with positive responses are summarized by antigen.	Measured at Month 30.5
Primary	Part B: Level of IgG Binding Antibodies to 3 V1V2-scaffolded Env Proteins in the Extension Study	Serum HIV-1-specific 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. The measure unit fluorescence units are relative to assay background, not relative to the placebo arm. Background is used here rather than negative control stimulation, since the antigens are used as bead coating rather than stimulation.	Measured at Month 30.5
Primary	Part B: Occurrence of IgG Ab Binding to gp120 Env Proteins Contained in the Vaccine (ZM96, TV1.C, 1086.C) in the Extension Study	Measured by HIV-1 multiplex Ab assay: refer to earlier description for assay methods and analysis variable derivation. The number and percentage of participants with positive responses are summarized by antigen.	Measured at Month 30.5
Primary	Part B: Level of IgG Ab Binding to gp120 Env Proteins Contained in the Vaccine (ZM96, TV1.C, 1086.C) in the Extension Study	Serum HIV-1-specific 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. The measure unit fluorescence units are relative to assay background, not relative to the placebo arm. Background is used here rather than negative control stimulation, since the antigens are used as bead coating rather than stimulation.	Measured at Month 30.5
Primary	Part B: Occurrence of CD4+ T Cell Responses to the HIV Proteins Included in the Vaccine in the Extension Study	Measured by flow cytometry ICS assay: refer to earlier description for assay methods and analysis variable derivation. The number and percentage of participants with positive responses are summarized by peptide pool.	Measured at Month 30.5
Primary	Part B: Level of CD4+ T Cell Responses to the HIV Proteins Included in the Vaccine in the Extension Study	Measured by flow cytometry ICS assay: refer to earlier description for assay methods and analysis variable derivation. Percentage of T-cells expressing cytokines are summarized for positive responders only.	Measured at Month 30.5
Secondary	Part A: Frequency of Severe Local Reactogenicity Signs and Symptoms, Through the Fifth Vaccination	Graded according to the Division of AIDS (DAIDS) Table for Grading the Severity of Adult and Pediatric Adverse Events, Version 2.1 [March 2017]. The maximum grade observed for each symptom over the time frame is presented.	Measured through 3 days after each vaccination at Month 0, 1, 3, 6, and 12
Secondary	Part A: Frequency of Severe Systemic Reactogenicity Signs and Symptoms, Through the Fifth Vaccination	Graded according to the Division of AIDS (DAIDS) Table for Grading the Severity of Adult and Pediatric Adverse Events, Version 2.1 [March 2017]. The maximum grade observed for each symptom over the time frame is presented.	Measured through 3 days after each vaccination at Month 0, 1, 3, 6, and 12
Secondary	Part A: Compare the Occurrence of IgG Ab Binding to gp120 Env Proteins Contained in the Vaccine (ZM96, TV1.C, 1086.C) After the Fourth Versus the Fifth Vaccination	Serum HIV-1-specific 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. Samples from post-enrollment visits have positive responses if they meet three conditions: (1) net MFI greater than or equal to an antigen-specific response threshold (defined as the maximum of 100 and the 95th percentile of pre-vaccination net MFI), (2) net MFI values are greater than 3 times pre-vaccination net MFI, and (3) experimental antigen MFI values are greater than 3 times pre-vaccination MFI. Data are excluded if the blood draw date was outside the allowable window, a participant was HIV-infected, or the reference antigen exceeds 5000 MFI.	Measured at Month 6.5 and 12.5
Secondary	Part A: Compare the Level of IgG Ab Binding to gp120 Env Proteins Contained in the Vaccine (ZM96, TV1.C, 1086.C) After the Fourth Versus the Fifth Vaccination	Serum HIV-1-specific 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. The measure unit fluorescence units are relative to assay background, not relative to the placebo arm. Background is used here rather than negative control stimulation, since the antigens are used as bead coating rather than stimulation. Comparisons were performed among positive responders only (positivity criteria is described in Outcome 30).	Measured at Month 6.5 and 12.5
Secondary	Part A: Compare the Occurrence of IgG Binding Antibodies to 3 V1V2-scaffolded Env Proteins After the Fourth Versus the Fifth Vaccination	Serum HIV-1-specific 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. Samples from post-enrollment visits have positive responses if they meet three conditions: (1) net MFI greater than or equal to an antigen-specific response threshold (defined as the maximum of 100 and the 95th percentile of pre-vaccination net MFI), (2) net MFI values are greater than 3 times pre-vaccination net MFI, and (3) experimental antigen MFI values are greater than 3 times pre-vaccination MFI. Data are excluded if the blood draw date was outside the allowable window, a participant was HIV-infected, or the reference antigen exceeds 5000 MFI.	Measured at Month 6.5 and 12.5
Secondary	Part A: Compare the Level of IgG Binding Antibodies to 3 V1V2-scaffolded Env Proteins After the Fourth Versus the Fifth Vaccination	Serum HIV-1-specific 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. The measure unit fluorescence units are relative to assay background, not relative to the placebo arm. Background is used here rather than negative control stimulation, since the antigens are used as bead coating rather than stimulation. Comparisons were performed among positive responders only (positivity criteria is described in Outcome 32).	Measured at Month 6.5 and 12.5
Secondary	Part A: Compare the Occurrence of CD4+ T Cell Responses to the HIV Proteins Included in the Vaccine After the Fourth Versus the Fifth Vaccinations	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 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 p<=0.00001. Data are excluded if the blood draw date was outside the visit window, the participant was HIV-infected, PBMC viability or T-cell count were low, or negative control was high.	Measured at Month 6.5 and 12.5
Secondary	Part A: Compare the Level of CD4+ T Cell Responses to the HIV Proteins Included in the Vaccine After the Fourth Versus the Fifth Vaccinations	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 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 p<=0.00001. Data are excluded if the blood draw date was outside the visit window, the participant was HIV-infected, PBMC viability or T-cell count were low, or negative control was high. Comparisons were performed among positive responders only.	Measured at Month 6.5 and 12.5
Secondary	Part B: Occurrence of IgG Ab Binding to gp120 Env Proteins Contained in the Vaccine (ZM96, TV1.C, 1086.C) in the Extension Study, at 6 Months After the Month 30 Vaccination	Serum HIV-1-specific 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. Samples from post-enrollment visits have positive responses if they meet three conditions: (1) net MFI greater than or equal to an antigen-specific response threshold (defined as the maximum of 100 and the 95th percentile of pre-vaccination net MFI), (2) net MFI values are greater than 3 times pre-vaccination net MFI, and (3) experimental antigen MFI values are greater than 3 times pre-vaccination MFI. Data are excluded if the blood draw date was outside the allowable window, a participant was HIV-infected, or the reference antigen exceeds 5000 MFI.	Measured at Month 30 and 36
Secondary	Part B: Level of IgG Ab Binding to gp120 Env Proteins Contained in the Vaccine (ZM96, TV1.C, 1086.C) in the Extension Study, at 6 Months After the Month 30 Vaccination	Serum HIV-1-specific 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. The measure unit fluorescence units are relative to assay background, not relative to the placebo arm. Background is used here rather than negative control stimulation, since the antigens are used as bead coating rather than stimulation.	Measured at Month 30 and 36
Secondary	Part B: Occurrence of IgG Binding Antibodies to 3 V1V2-scaffolded Env Proteins in the Extension Study, at 6 Months After the Month 30 Vaccination	Serum HIV-1-specific 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. Samples from post-enrollment visits have positive responses if they meet three conditions: (1) net MFI greater than or equal to an antigen-specific response threshold (defined as the maximum of 100 and the 95th percentile of pre-vaccination net MFI), (2) net MFI values are greater than 3 times pre-vaccination net MFI, and (3) experimental antigen MFI values are greater than 3 times pre-vaccination MFI. Data are excluded if the blood draw date was outside the allowable window, a participant was HIV-infected, or the reference antigen exceeds 5000 MFI.	Measured at Month 30 and 36
Secondary	Part B: Level of IgG Binding Antibodies to 3 V1V2-scaffolded Env Proteins in the Extension Study, at 6 Months After the Month 30 Vaccination	Serum HIV-1-specific 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. The measure unit fluorescence units are relative to assay background, not relative to the placebo arm. Background is used here rather than negative control stimulation, since the antigens are used as bead coating rather than stimulation.	Measured at Month 30 and 36
Secondary	Part B: Occurrence of CD4+ T Cell Responses to the HIV Proteins Included in the Vaccine in the Extension Study, at 6 Months After the Month 30 Vaccination	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 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 p<=0.00001. Data are excluded if the blood draw date was outside the visit window, the participant was HIV-infected, PBMC viability or T-cell count were low, or negative control was high.	Measured at Month 30 and 36
Secondary	Part B: Level of CD4+ T Cell Responses to the HIV Proteins Included in the Vaccine in the Extension Study, at 6 Months After the Month 30 Vaccination	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 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 p<=0.00001. Data are excluded if the blood draw date was outside the visit window, the participant was HIV-infected, PBMC viability or T-cell count were low, or negative control was high.	Measured at Month 30 and 36