Safety and Immunogenicity of Apical Membrane Antigen 1 (PfAMA-1-FVO[25-545])

Malaria Clinical Trial

Official title: Randomized Controlled Trial to Evaluate the Safety and Immunogenicity of Recombinant Pichia Pastoris-Expressed P. Falciparum Apical Membrane Antigen 1 (PfAMA-1-FVO[25-545]) Versus Tetanus Toxoid, in Healthy Malian Adult in Bandiagara

Status Recruiting

Clinical Trial Summary

This study will be the first time that the candidate malaria vaccine Apical Membrane Antigen 1 (PfAMA-1-FVO[25-545]) will be tested in malaria endemic populations. The phase Ib study will include adults who will be randomly allocated to either receive the malaria vaccine or the vaccine against Tetanus. Each participant will receive 3 immunizations, without the clinical investigators or the participants themselves knowing what has been given. They will then be follow-up up for immediate reactions to vaccination, and also over a longer term of one year. Blood will be taken to evaluate the biological safety parameters and also immune responses.

Clinical Trial Description

This will be a randomized controlled trial to evaluate the Safety and Immunogenicity of recombinant pichia pastoris blood stage malaria vaccine Apical Membrane Antigen 1 (PfAMA-1-FVO[25-545]) versus tetanus toxoid, in healthy Malian adults in Bandiagara.

A phase Ia trial is currently ongoing and its interim results will be used to select the best dose/adjuvant combination to be brought to Africa. The trial is evaluating safety and immunogenicity of AMA-1 (10 µg or 50 µg) adjuvanted with aluminum hydroxide or Montanide ISA 720, or ASO2.

• Primary objective:

• To evaluate the safety of one dose of AMA-1 (10 µg or 50 µg) adjuvanted with aluminum hydroxide or Montanide ISA 720, or ASO2, given at D0, D28 and D56 in healthy Malian adults.

• Secondary Objectives:

• To assess the humoral response to the vaccine antigen by measuring the variation in the level of IgG and its ability to recognize the native protein on merozoites.

• To assess the cellular immune response by measuring the T cell proliferation and cytokine production following in vitro stimulation with the vaccine antigen.

The primary immunizations will be administered on days 0, 28 and a boost given at day 56. The participants will be followed up actively during the vaccination phase, and passively for one another 9 months. The will be 19 scheduled clinic visits and following will the the schedule for obtaining serology data D-28, D0, D28, D56, D84, D140 and D365

• The primary evaluation will include the following:

• Solicited adverse events measured from day 0 to day 7 after each dose;

• Unsolicited adverse events measured up to one month after each dose;

• Serious Adverse Event (SAE) measured during the 12 months of study duration.

• Biological safety: two and four weeks after each vaccination, and thereafter every 12 weeks, in reference with the baseline before the first dose, by measuring the following RBC, hemoglobin, hematocrit, MCV, MCH, MCHC, platelets, WBC with differential counts, potassium, sodium, ASAT, ALAT, total bilirubin, alkaline phosphatase, γGT, creatinin.

• Secondary evaluation criteria:

• The humoral response to the vaccine antigen: assessed by measuring the level of IgG by ELISA.

• An IFA for at least two parasite strains will be used to verify that the antibodies elicited by the vaccine recognize the native protein on merozoites

• Statistical methods:

Descriptive methods shall be employed to evaluate the above criteria. ;

Study Design

Allocation: Randomized, Endpoint Classification: Safety Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Prevention

Related Conditions & MeSH terms

• Malaria

• NCT number: NCT00431808
• Study type: Interventional
• Source: African Malaria Network Trust
• Status: Recruiting
• Phase: Phase 1
• Start date: May 2007
• Completion date: June 2008