Safety and Immunogenicity of the Na-APR-1 Hookworm Vaccine in Healthy Adults
Status and phase
Conditions
Treatments
Details and patient eligibility
About
Hookworms digest hemoglobin from erythrocytes for use as an energy source via a proteolytic cascade that begins with the aspartic protease, APR-1. Vaccination with recombinant APR-1 has protected animals from infection in challenge studies. This study will evaluate the safety and immunogenicity of two formulations of Na-APR-1 (M74) in healthy adult volunteers when co-administered with different concentrations of the immunostimulant GLA-AF.
Full description
Open-label, dose-escalation phase 1 clinical trial in healthy, hookworm-naïve adults:
- Study site: George Washington Medical Faculty Associates, Washington, DC
- Number of participants: 40 in 2 cohorts of 20.
In Cohort 1 five (5) volunteers will receive 30 µg Na-APR-1 (M74) /Alhydrogel®, five (5) will receive 30 µg Na-APR-1 (M74)/Alhydrogel® plus 2.5 µg GLA-AF, and ten (10) will receive 30 µg Na-APR-1 (M74) /Alhydrogel® plus 5 µg GLA-AF. In Cohort 2 five (5) volunteers will receive 100 µg Na-APR-1 (M74)/Alhydrogel®, five (5) will receive 100 µg Na-APR-1 (M74) /Alhydrogel® plus 2.5 µg GLA-AF, and ten (10) will receive 100 µg Na-APR-1 (M74)/Alhydrogel® plus 5 µg GLA-AF.
The cohorts will be enrolled in a staggered fashion with safety data assessed prior to the Na-APR-1 dose escalation from 30 to 100 µg. In addition, within each cohort, vaccinations will be staggered such that formulations containing 0, 2.5, and 5 µg GLA-AF will be tested sequentially: for example, those receiving Na-APR-1 (M74)/Alhydrogel® in combination with 2.5 µg GLA-AF will be vaccinated no sooner than 3 days after the last volunteer is vaccinated with the formulation containing no GLA-AF, whereas those vaccinated with Na-APR-1 (M74)/Alhydrogel® plus 5 µg GLA-AF will be vaccinated no sooner than 7 days after the last one receives the 2.5 µg GLA-AF formulation.
- Immunization schedule: Study days 0, 56 and 112.
- Route: IM in the deltoid muscle.
- Doses of Na-APR-1 (M74) to be tested: 30 and 100 µg.
- Doses of Alhydrogel®: 240 and 800 µg for the 30 and 100 µg doses of Na-APR-1 (M74), respectively.
- Doses of GLA-AF to be tested: 2.5 µg and 5 µg.
- Study duration: 44 weeks (10 months) per study participant; total duration of the study estimated at approximately 13 months.
Enrollment
Sex
Ages
Volunteers
Inclusion criteria
- Males or females between 18 and 50 years, inclusive.
- Good general health as determined by means of the screening procedure.
- Available for the duration of the trial (44 weeks).
- Willingness to participate in the study as evidenced by signing the informed consent document.
Exclusion criteria
- Pregnancy as determined by a positive urine human choriogonadotropin (hCG) (if female).
- Participant unwilling to use reliable contraception methods up until one month following the third immunization (if female and not surgically sterile, abstinent or at least 2 years post-menopausal).
- Currently lactating and breast-feeding (if female).
- Evidence of clinically significant neurologic, cardiac, pulmonary, hepatic, rheumatologic, autoimmune, diabetes, or renal disease by history, physical examination, and/or laboratory studies.
- Known or suspected immunodeficiency.
- Laboratory evidence of liver disease (alanine aminotransferase [ALT] greater than 1.25-times the upper reference limit).
- Laboratory evidence of renal disease (serum creatinine greater than 1.25-times the upper reference limit, or more than trace protein or blood on urine dipstick testing).
- Laboratory evidence of hematologic disease (hemoglobin <11.5 g/dl [females] or <12.5 g/dl [males]; absolute leukocyte count <3600/mm3 or >10.7 x 103/mm3; absolute neutrophil count [ANC] <1700/ mm3; absolute lymphocyte count <700/mm3; or platelet count <140,000/mm3).
- Laboratory evidence of a coagulopathy (PTT or PT INR greater than 1.1-times the upper reference limit).
- Serum glucose (random) greater than 1.2-times the upper reference limit.
- Other condition that in the opinion of the investigator would jeopardize the safety or rights of a volunteer participating in the trial or would render the subject unable to comply with the protocol.
- Participation in another investigational vaccine or drug trial within 30 days of starting this study.
- Volunteer has had medical, occupational, or family problems as a result of alcohol or illicit drug use during the past 12 months.
- History of a severe allergic reaction or anaphylaxis.
- Severe asthma as defined by the need for daily use of inhalers or emergency clinic visit or hospitalization within 6 months of the volunteer's expected first vaccination in the study.
- Positive ELISA for hepatitis B surface antigen (HBsAg).
- Positive confirmatory test for HIV infection.
- Positive confirmatory test for hepatitis C virus (HCV) infection.
- Use of corticosteroids (excluding topical or nasal) or immunosuppressive drugs within 30 days of the volunteer's expected first vaccination in this study.
- Receipt of a live vaccine within 4 weeks or a killed vaccine within 2 weeks prior to the volunteer's expected first vaccination in the study.
- History of a surgical splenectomy.
- Receipt of blood products within the past 6 months.
- History of previous infection with hookworm or residence for more than 6 months in a hookworm-endemic area.
Trial design
Primary purpose
Allocation
Interventional model
Masking
40 participants in 6 patient groups
Trial contacts and locations
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Data sourced from clinicaltrials.gov
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