cAd3-Marburg Vaccine in Healthy Adults

RV 507: A Phase I Open-Label, Dose-Escalation Clinical Trial to Evaluate the Safety, Tolerability and Immunogenicity of the Marburg Chimpanzee Adenovirus Vector Vaccine, VRC-MARADC087-00-VP (cAd3-Marburg), in Healthy Adults

Status

Completed

Phases

Phase 1

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT03475056

Enrollment

Registered

2018-03-23

Start date

2018-10-09

Completion date

2019-12-19

Last updated

2022-08-11

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Marburg Virus Disease

Keywords

Marburg virus, Marburg vaccine, cAd3-Marburg vaccine

Brief summary

RV 507 was a Phase I, open-label study to examine the safety, tolerability and immunogenicity of an investigational Marburg vaccine given by intramuscular (IM) injection to healthy adults. The study was a dose escalation of VRC-MARADC087-00-VP, a chimpanzee adenovirus serotype 3 (cAd3) vector vaccine, which encodes wild type (WT) glycoprotein (GP) from Marburgvirus.

Detailed description

A total of 40 participants were evenly split, with 20 in each of the two dosage groups, to receive the investigational cAd3-Marburg vaccine at a dose of either 1x10\^10 particle units (PU) (Group 1) or 1x10\^11 PU (Group 2). The dose escalation plan included daily review of any new safety data by a study clinician, regular review of safety data by the protocol team and a staged enrollment plan with required interim safety reviews. The study began with enrollment of 3 participants into Group 1 (1x10\^10 PU) at a rate of 1 participant per day. After at least 7 days of follow-up for the first 3 vaccinated participants, an interim safety review occurred before enrollment of additional participants into the group. No safety issues were identified; therefore, an additional 17 participants were enrolled to complete Group 1. When there was a minimum of seven days of follow-up safety data from the last enrolled participant in Group 1, an interim safety review occurred. Once no safety issues were identified, enrollment of participants into the next dose level began with the enrollment of 3 participants at a rate of 1 participant per day. After at least 7 days of follow-up for the first 3 vaccinated participants in Group 2 (1x10\^11 PU), an interim safety review occurred before the enrollment of additional participants into Group 2. No safety issues were identified and an additional 17 participants were enrolled to complete Group 2. Participants were followed for approximately 48 weeks.

Interventions

BIOLOGICALcAd3-Marburg vaccine

The recombinant chimpanzee adenovirus Type 3-vectored Marburg vaccine, VRC-MARADC087-00-VP (cAd3-Marburg) is composed of a cAd3 vector that expresses Marburg wild type glycoprotein (WT GP).

Study design

Allocation

NON_RANDOMIZED

Intervention model

SEQUENTIAL

Primary purpose

PREVENTION

Masking

NONE

Intervention model description

Dose escalation

Eligibility

Sex/Gender

ALL

Age

18 Years to 50 Years

Healthy volunteers

Yes

Inclusion criteria

1. 18 to 50 years old 2. Available for clinical follow-up through Week 48 after enrollment 3. Able to provide proof of identity to the satisfaction of the study clinician completing the enrollment process. Proof of identity includes a valid U.S. government-issued or state-issued photo identification (ID) such as a driver's license, military ID, or U.S. passport. 4. Able and willing to provide a personal mobile phone number or home phone number at which the participant can be reliably contacted. Participants will be contacted primarily for study visit 2A (Appendix 1), as a reminder of an upcoming visit, and after missed visits for rescheduling purposes. 5. Able and willing to complete the informed consent process and demonstrate understanding with a passing score (90% or greater) on the Assessment of Understanding (AOU) by the third attempt. 6. In good general health without clinically significant medical history. 7. Physical examination and laboratory results without clinically significant findings and a body mass index (BMI) ≤ 40 within the 56 days prior to enrollment. 8. Laboratory Criteria within 56 days prior to enrollment: 1. Hemoglobin ≥ 11.5 g/dL for women; ≥13.0 g/dL for men. 2. White blood cells (WBC) = 3,300-12,000 cells/mm\^3. 3. Total lymphocyte count ≥ 800 cells/mm\^3. 4. Platelets = 125,000 - 400,000/mm\^3. 5. Alanine aminotransferase (ALT) ≤ 1.25 x upper limit of normal. 6. Serum creatinine ≤ 1 x upper limit of normal. 7. HIV-uninfected as evidenced by a negative FDA-approved HIV diagnostic blood test. Female-Specific Criteria: 9. Negative β-HCG (human chorionic gonadotropin) pregnancy test; serum β-HCG at screening (or urine if screening is the same day as enrollment) and urine β-HCG at enrollment if woman is of reproductive potential. 10. Agrees to use an effective means of birth control from at least 21 days prior to enrollment through 24 weeks after study vaccination if assessed to be of reproductive potential.

Exclusion criteria

Volunteer has received any of the following substances: 1. Investigational Ebola or Marburg vaccine in a prior clinical trial or prior receipt of a cAd3 vectored investigational vaccine. 2. Immunosuppressive medications within 2 weeks prior to enrollment. 3. Blood products within 112 days (16 weeks) prior to enrollment. 4. Investigational research agents within 28 days (4 weeks) prior to enrollment. 5. Live attenuated vaccines within 28 days (4 weeks) prior to enrollment. 6. Subunit or killed vaccines within 14 days (2 weeks) prior to enrollment. 7. Current anti-tuberculosis prophylaxis or therapy. Female-specific criteria: 8. Woman who is pregnant, breast-feeding or planning to become pregnant during the first 24 weeks after study vaccine administration. Volunteer has a history of any of the following clinically significant conditions: 9. Serious adverse reactions to vaccines such as anaphylaxis, urticaria (hives), respiratory difficulty, angioedema, or abdominal pain. 10. Allergic reaction to excipients in the study vaccine including gentamycin, neomycin or streptomycin. 11. Clinically significant autoimmune disease or immunodeficiency. 12. Asthma that is not well controlled. 13. Positive syphilis serology. False-positive results will also exclude a participant. 14. Diabetes mellitus (type I or II). 15. Thyroid disease that is not well controlled. 16. A history of hereditary angioedema (HAE), acquired angioedema (AAE), or idiopathic forms of angioedema. 17. Idiopathic urticaria within the last 1 year. 18. Hypertension that is not well controlled. 19. Bleeding disorder diagnosed by a doctor (e.g. factor deficiency, coagulopathy, or platelet disorder requiring special precautions) or significant bruising or bleeding difficulties with intramuscular (IM) injections or blood draws. 20. A malignancy that is active, currently being treated, or not surgically cured. 21. Seizure in the past 3 years or treatment for seizure disorder in the past 3 years. 22. Asplenia or functional asplenia. 23. Psychiatric condition that precludes compliance with the protocol; past or present psychoses; or within five years prior to enrollment, history of a suicide plan or attempt. 24. Any medical, psychiatric, social condition, occupational reason or other responsibility that, in the judgment of the investigator, is a contraindication to protocol participation or impairs a volunteer's ability to give informed consent.

Design outcomes

Primary

Measure	Time frame	Description
Number of Participants With Serious Adverse Events (SAEs)	Through 48 weeks after study product administration	SAEs were recorded from receipt of the study product administration through the last expected study visit at Week 48. The relationship between a SAE and the study product was assessed by the investigator based on clinical judgment and the definitions outlined in the protocol. A participant with multiple experiences of the same event is counted once using the event of worst severity.
Number of Participants Reporting Local Reactogenicity Signs and Symptoms for 7 Days After the cAd3-Marburg Vaccine Administration	7 days after study product administration	Participants recorded the occurrence of solicited symptoms on a diary card for 7 days after the study product administration and reviewed the diary card with clinic staff at a follow up visit. Participants were counted once for each symptom at the worst severity if they indicated experiencing the symptom more than one time at any severity during the reporting period. The number reported for Any Local Symptom is the number of participants reporting any local symptom at the worst severity. Reactogenicity grading (Mild, Moderate, Severe) was done using the Toxicity Grading Scale for Healthy Adult and Adolescent Volunteers Enrolled in Preventive Vaccine Clinical Trials (FDA Guidance - September 2007).
Number of Participants Reporting Systemic Reactogenicity Signs and Symptoms for 7 Days After the cAd3-Marburg Vaccine Administration	7 days after study product administration	Participants recorded the occurrence of solicited symptoms on a diary card for 7 days after the study product administration and reviewed the diary card with clinic staff at a follow up visit. Participants were counted once for each symptom at the worst severity if they indicated experiencing the symptom more than one time at any severity during the reporting period. The number reported for Any Systemic Symptom is the number of participants reporting any systemic symptom at the worst severity. The majority of the reactogenicity grading (Mild, Moderate, Severe) was done using the Toxicity Grading Scale for Healthy Adult and Adolescent Volunteers Enrolled in Preventive Vaccine Clinical Trials (FDA Guidance - September 2007).The Division of AIDS AE Grading Table Corrected (Version 2.1-July 2017) was used to grade reported events of joint pain (arthralgia).
Total Number of Participants Reporting Any Reactogenicity Signs and Symptoms for 7 Days After the cAd3-Marburg Vaccine Administration	7 days after study product administration	Participants recorded the occurrence of solicited symptoms on a diary card for 7 days after the study product administration.
Number of Participants With Abnormal Laboratory Measures of Safety	Through 48 weeks after study product administration	Any abnormal laboratory results recorded as unsolicited AEs are summarized. Labs included hematology (hemoglobin, hemoglobin change from baseline, hematocrit percent, mean corpuscular volume (MCV), platelets, and white blood cell (WBC), red blood cell (RBC) and lymphocyte counts) and chemistry (alanine aminotransferase (ALT) and creatinine). Complete blood count (CBC) with total lymphocyte count results were collected at screening (≤ 56 days before enrollment), Day 0 prior to study product administration (baseline), Day 3, and Weeks 2, 4, 8 and 24. Creatinine and ALT results were collected at screening, Day 0, Day 3 and Weeks 2, 4 and 8. Institutional laboratory normal ranges as well as the Toxicity Grading Scale for Healthy Adult and Adolescent Volunteers Enrolled in Preventative Vaccine Clinical Trials FDA Guidance, September 2007 were used.
Number of Participants With One or More Unsolicited Non-Serious Adverse Events (AEs)	Through 28 days after study product administration	Unsolicited AEs and attribution assessments were recorded in the study database from receipt of the study product administration through the visit scheduled for 28 days after study product administration. At other time periods greater than 28 days after the study product administration, only serious AEs (SAEs reported as a separate outcome and in the AE module), and new chronic medical conditions that required ongoing medical management were recorded through the last study visit. The relationship between an AE and the study product was assessed by the investigator based on clinical judgment and the definitions outlined in the protocol. A participant with multiple experiences of the same event is counted once using the event of worst severity.

Secondary

Measure	Time frame	Description
Mean Titers of Antibodies to the Recombinant Chimpanzee Adenovirus Serotype 3 (cAd3) Vector at 28 Days After the cAd3-Marburg Vaccine Administration	Through 28 days after study product administration	Vaccine-induced, cAd3-specific antibody responses as measured by neutralization assay. Participant blood samples were tested for cAd3-specific neutralizing activity, prior to and following vaccination, using a luciferase reporter gene virus neutralization assay as previously described (Clin Vaccine Immunol 2014; 21:783-6, References Section).
Mean Titers of Antibodies to the Human Adenovirus Serotype 5 (Ad5) Vector at 28 Days After the cAd3-Marburg Vaccine Administration	Through 28 days after study product administration	Vaccine-induced, Ad5-specific antibody responses as measured by neutralization assay. Participant blood samples were tested for Ad5-specific neutralizing activity, prior to and following vaccination, using a luciferase reporter gene virus neutralization assay as previously described (Clin Vaccine Immunol 2014; 21:783-6, References Section).
Percentage of Participants With a Positive Marburg-Specific Antibody Response After the cAd3-Marburg Vaccine Administration	Through 28 days after study product administration	A positive response occurs if there is a significant increase in the ELISA post vaccination compared to baseline. For each participant, a t-test was performed to compare the post vaccination titers versus those at baseline. A participant is defined as a positive responder if the one-sided t-test has a p-value \< 0.05.
Magnitude of Marburg-Specific Antibody Responses After the cAd3-Marburg Vaccine Administration	Through 28 days after study product administration	Geometric mean titer (GMT) was calculated along with 95% confidence intervals at Week 4 for each dose group.
Percentage of Participants With Positive Marburg-specific T Cell Responses After the cAd3-Marburg Vaccine Administration	Through 28 days after study product administration	T cell response was measured by Intracellular Cytokine Staining (ICS) assays using Peripheral Blood Mononuclear Cells (PBMCs) at 4 weeks after vaccination. The percentage of participants with T cell responses with Clopper-Pearson 95% Confidence Intervals are presented. Positivity is defined as a response over calculated thresholds determined by the trial statistician.
Magnitude of Marburg-specific T Cell Responses After the cAd3-Marburg Vaccine Administration	Through 28 days after study product administration	Median and interquartile ranges presented for total cytokine responses for both CD4 and CD8 memory T cells based on a T cell response with any cytokine at Week 4 for each dose group.

Countries

United States

Participant flow

Recruitment details

Healthy adults were recruited at the Walter Reed Army Institute of Research (WRAIR) Clinical Trials Center (CTC) in Silver Spring, Maryland, USA.

Participants by arm

Arm	Count
Group 1: cAd3-Marburg Vaccine (1x10^10 PU) cAd3-Marburg vaccine (1x10\^10 PU) administered intramuscularly (IM) with needle and syringe in a volume of 1 mL cAd3-Marburg vaccine: The recombinant chimpanzee adenovirus Type 3-vectored Marburg vaccine, VRC-MARADC087-00-VP (cAd3-Marburg) is composed of a cAd3 vector that expresses Marburg wild type glycoprotein (WT GP).	20
Group 2: cAd3-Marburg Vaccine (1x10^11 PU) cAd3-Marburg vaccine (1x10\^11 PU) administered IM with needle and syringe in a volume of 1 mL cAd3-Marburg vaccine: The recombinant chimpanzee adenovirus Type 3-vectored Marburg vaccine, VRC-MARADC087-00-VP (cAd3-Marburg) is composed of a cAd3 vector that expresses Marburg wild type glycoprotein (WT GP).	20
Total	40

Withdrawals & dropouts

Period	Reason	FG000	FG001
Overall Study	Lost to Follow-up	0	1
Overall Study	Moved from Area	0	2

Baseline characteristics

Characteristic	Group 1: cAd3-Marburg Vaccine (1x10^10 PU)	Group 2: cAd3-Marburg Vaccine (1x10^11 PU)	Total
Age, Customized 18-20 years	1 Participants	0 Participants	1 Participants
Age, Customized 21-30 years	4 Participants	7 Participants	11 Participants
Age, Customized 31-40 years	7 Participants	8 Participants	15 Participants
Age, Customized 41-50 years	8 Participants	5 Participants	13 Participants
Body Mass Index (BMI) 18.5-24.9 kg/m^2	6 Participants	8 Participants	14 Participants
Body Mass Index (BMI) 25.0-29.9 kg/m^2	10 Participants	7 Participants	17 Participants
Body Mass Index (BMI) 30.0-40.0 kg/m^2	4 Participants	5 Participants	9 Participants
Ethnicity (NIH/OMB) Hispanic or Latino	2 Participants	4 Participants	6 Participants
Ethnicity (NIH/OMB) Not Hispanic or Latino	18 Participants	16 Participants	34 Participants
Ethnicity (NIH/OMB) Unknown or Not Reported	0 Participants	0 Participants	0 Participants
Race (NIH/OMB) American Indian or Alaska Native	0 Participants	1 Participants	1 Participants
Race (NIH/OMB) Asian	2 Participants	3 Participants	5 Participants
Race (NIH/OMB) Black or African American	10 Participants	4 Participants	14 Participants
Race (NIH/OMB) More than one race	0 Participants	1 Participants	1 Participants
Race (NIH/OMB) Native Hawaiian or Other Pacific Islander	1 Participants	0 Participants	1 Participants
Race (NIH/OMB) Unknown or Not Reported	0 Participants	0 Participants	0 Participants
Race (NIH/OMB) White	7 Participants	11 Participants	18 Participants
Sex: Female, Male Female	12 Participants	13 Participants	25 Participants
Sex: Female, Male Male	8 Participants	7 Participants	15 Participants

Adverse events

Event type	EG000 affected / at risk	EG001 affected / at risk
deaths Total, all-cause mortality	0 / 20	0 / 20
other Total, other adverse events	11 / 20	16 / 20
serious Total, serious adverse events	2 / 20	0 / 20

Outcome results

Primary

Number of Participants Reporting Local Reactogenicity Signs and Symptoms for 7 Days After the cAd3-Marburg Vaccine Administration

Participants recorded the occurrence of solicited symptoms on a diary card for 7 days after the study product administration and reviewed the diary card with clinic staff at a follow up visit. Participants were counted once for each symptom at the worst severity if they indicated experiencing the symptom more than one time at any severity during the reporting period. The number reported for Any Local Symptom is the number of participants reporting any local symptom at the worst severity. Reactogenicity grading (Mild, Moderate, Severe) was done using the Toxicity Grading Scale for Healthy Adult and Adolescent Volunteers Enrolled in Preventive Vaccine Clinical Trials (FDA Guidance - September 2007).

Time frame: 7 days after study product administration