Safety and Protective Efficacy of Pb(PfCS@UIS4)

Malaria,Falciparum Clinical Trial

— PbVac  

Official title:

Safety and Protective Efficacy of Genetically Modified Plasmodium Berghei (Pb(PfCS@UIS4)) Malaria Parasites in Healthy Volunteers

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03138096
• Other study ID #: PbVac
• Status: Completed
• Phase: Phase 1/Phase 2
• Start date: May 29, 2017
• Est. completion date: October 3, 2018

Study information

• Verified date: March 2017
• Source: Radboud University Medical Center
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

In the underlying study, a genetically modified P. berghei parasite is used. P. berghei is one of the four Plasmodium species that causes malaria in rodents. The hypothesis is that immunization of humans with P. berghei will induce a cross-species immune response without the risk of a breakthrough infection. To further increase the potential for protective efficacy, the P. falciparum circumsporozoite (CS)- protein gene has been integrated in the P. berghei parasite, generating a genetically modified P. berghei parasite, abbreviated as Pb(PfCS@UIS4).

Recruitment information / eligibility

• Status: Completed
• Enrollment: 24
• Est. completion date: October 3, 2018
• Est. primary completion date: March 28, 2018
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 35 Years

Eligibility

Inclusion Criteria:

1. Subject is aged = 18 and = 35 years and in good health.

2. Subject has adequate understanding of the procedures of the study and is able and willing (in the investigator's opinion) to comply with all study requirements.

3. Subject is willing to complete an informed consent questionnaire and is able to answer all questions correctly.

4. Subject is able to communicate well with the investigator and is available to attend all study visits, lives in Rotterdam or in proximity to the trial centre (can be on site within 1 hour) or is willing to stay in a hotel close to the trial centre during part of the study (phase 1: from day of immunization to day 12 post-immunization; phase 2: from day of immunization to day 8 post-immunization.

5. The subject will remain within the Netherlands from day -1 until day +28 after immunization during phase 1; from day -1 until day 12 after each immunization during phase 2, and during the challenge period, will not travel to a malaria-endemic area during the study period, and is reachable (24/7) by mobile telephone throughout the entire study period.

6. Subject agrees to their general practitioner being informed and contacted about their participation in the study and agrees to sign a form to request the release by their General Practitioner (GP), and medical specialist when necessary, to the investigator(s), of any relevant medical information concerning possible contra-indications for participation in the study.

7. The subject agrees to refrain from blood donation to Sanquin or for other purposes throughout the study period and for a defined period thereafter according to current Sanquin guidelines (3 years minimum, depending on serology).

8. For female subjects: subject agrees to use continuous adequate contraception** and not to breastfeed for the duration of study.

9. Subject agrees to refrain from intensive physical exercise (disproportionate to the subject's usual daily activity or exercise routine) during the malaria challenge period.

10. Subject agrees to avoid additional triggers that may cause elevations in liver enzymes including alcohol from baseline up to 1 week post treatment.

11. Subject has signed written informed consent to participate in the trial.

Exclusion Criteria:

A potential subject who meets any of the following criteria will be excluded from participation in this study:

1. Any history, or evidence at screening, of clinically significant symptoms, physical signs or abnormal laboratory values suggestive of systemic conditions, such as cardiovascular, pulmonary, renal, hepatic, neurological, dermatological, endocrine, malignant, haematological, infectious, immunodeficient, psychiatric and other disorders, which could compromise the health of the volunteer during the study or interfere with the interpretation of the study results. These include, but are not limited to, any of the following.

1.1. Body weight <50 kg or Body Mass Index (BMI) <18 or >30 kg/m2 at screening. 1.2. A heightened risk of cardiovascular disease, as determined by: an estimated ten year risk of fatal cardiovascular disease of =5% at screening, as determined by the Systematic Coronary Risk Evaluation (SCORE); history, or evidence at screening, of clinically significant arrhythmia's, prolonged QT-interval or other clinically relevant ECG abnormalities; or a positive family history of cardiac events in 1st or 2nd degree relatives <50 years old.

1.3. A medical history of functional asplenia, sickle cell trait/disease, thalassaemia trait/disease or G6PD-deficiency.

1.4. History of epilepsy in the period of five years prior to study onset, even if no longer on medication.

1.5. Screening tests positive for Human Immunodeficiency Virus (HIV), active Hepatitis B Virus (HBV), Hepatitis C Virus (HCV) 1.6. Chronic use of i) immunosuppressive drugs, ii) antibiotics, iii) or other immune modifying drugs within three months prior to study onset (inhaled and topical corticosteroids and oral anti-histamines exempted) or expected use of such during the study period.

1.7. Any recent or current systemic therapy with an antibiotic or drug with potential anti-malarial activity (chloroquine, atovaquone-proguanil, arthemether-lumefantrine, sulfadoxine-pyrimethamine, doxycycline, tetracycline, piperaquine, benzodiazepine, flunarizine, fluoxetine, tetracycline, azithromycin, clindamycin, erythromycin, hydroxychloroquine, etc.) (allowable timeframe for use at the Investigator's discretion).

1.8. History of malignancy of any organ system (other than localized basal cell carcinoma of the skin), treated or untreated, within the past 5 years.

1.9. Any history of treatment for severe psychiatric disease by a psychiatrist in the past year.

1.10. History of drug or alcohol abuse interfering with normal social function in the period of one year prior to study onset, positive urine toxicology test for cocaine or amphetamines at screening or at inclusion, or positive urine toxicology test for cannabis at inclusion.

2. For female subjects: positive urine pregnancy test at screening and/or at the baseline visits, including baseline of immunizations (I-1) and or baseline before CHMI (C-1).

3. Any history of malaria, positive serology for P. falciparum, or previous participation in any malaria (vaccine) study.

4. Known hypersensitivity to or contra-indications (including co-medication) for use of sulfadoxine-pyrimethamine, piperaquine, chloroquine, Malarone®, artemether-lumefantrine, primaquine or history of severe (allergic) reactions to mosquito bites.

5. Receipt of any vaccinations in the 3 months prior to the start of the study or plans to receive any other vaccinations during the study period or up to 8 weeks thereafter.

6. Participation in any other clinical study in the 30 days prior to the start of the study or during the study period.

7. Being an employee or student of the department of Medical Microbiology and Infectious Diseases of the Erasmus MC or Radboudumc, or the department of Internal Medicine of the Radboudumc or Havenziekenhuis.

8. Any other condition or situation that would, in the opinion of the investigator, place the subject at an unacceptable risk of injury or render the subject unable to meet the requirements of the protocol.

Related Conditions & MeSH terms

• Controlled Human Malaria Infection (CHMI)
• Malaria
• Malaria, Falciparum
• Malaria,Falciparum
• Plasmodium Berghei
• Plasmodium Falciparum

Intervention

Biological:
• Pb(PfCS@UIS4)-infected mosquitoes
Pb(PfCS@UIS4)-infected mosquitoes

Other:
• Challenge infection P. falciparum
Challenge infection with bites of five infected Pf mosquitoes

Locations

Country	Name	City	State
Netherlands	Radboud university medical center	Nijmegen	Gelderland
Netherlands	Havenziekenhuis	Rotterdam

Sponsors (4)

Lead Sponsor	Collaborator
Radboud University Medical Center	Erasmus Medical Center, Havenziekenhuis, The PATH Malaria Vaccine Initiative (MVI)

Country where clinical trial is conducted

Netherlands, 

References & Publications (1)

Reuling IJ, Mendes AM, de Jong GM, Fabra-García A, Nunes-Cabaço H, van Gemert GJ, Graumans W, Coffeng LE, de Vlas SJ, Yang ASP, Lee C, Wu Y, Birkett AJ, Ockenhouse CF, Koelewijn R, van Hellemond JJ, van Genderen PJJ, Sauerwein RW, Prudêncio M. An open-lab — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Other	Cellular Immune Responses After Exposure to Pb(PfCS@UIS4) [Exploratory Endpoint]	Cellular immune responses after repeated exposure to Pb(PfCS@UIS4), as determined by increase in %-age IFNg+ lymphocytes following in vitro stimulation of PBMCs with WT P. falciparum sporozoites measured by flow cytometry at baseline and following immunization (day prior to CHMI)	Group 3: from baseline until day prior to CHMI (approximately 15 weeks after first Pb(PfCS@UIS4) immunization)
Other	Humoral Immune Responses After Exposure to Pb(PfCS@UIS4) [Exploratory Endpoint]	Humoral immune responses after repeated exposure to Pb(PfCS@UIS4) as determined by increase in %-age inhibition of WT P. falciparum sporozoite invasion in HC-04 cells by purified plasma IgG collected at baseline and following immunization (day prior to CHMI).	Group 3: from baseline until day prior to CHMI (approximately 15 weeks after first Pb(PfCS@UIS4) immunization)
Primary	Adverse Events in Study Groups Following Exposure to Pb(PfCS@UIS4)-Infected Mosquitoes [Safety]	Frequency and magnitude of adverse events in study groups following one or more exposures to Pb(PfCS@UIS4)-infected mosquitoes.	Groups 1&2: from exposure to Pb(PfCS@UIS4)-infected mosquitoes until 28 days thereafter. Group 3: from first exposure until 21 days after fourth/final exposure (=until day immediately prior to CHMI, i.e. approximately 15 weeks after first exposure).
Primary	Presence of Breakthrough Parasitemia Following Exposure to Pb(PfCS@UIS4)-Infected Mosquito Bites	Presence of breakthrough parasitemia following (first) exposure to Pb(PfCS@UIS4)-infected mosquito bites, as determined by thick blood smear microscopy	Groups 1-3: from (first) exposure until 28 days thereafter.
Primary	Time to Parasitemia After CHMI [Efficacy]	Time to parasitemia after CHMI with the wild-type NF54 P. falciparum strain, as detected by qPCR [Efficacy]	Groups 3&4: from day of CHMI until 28 days thereafter
Secondary	Immunogenicity of Pb(PfCS@UIS4) as Assessed by ELISA	Immunogenicity of repeated Pb(PfCS@UIS4) immunization as assessed by fold change in anti-P. falciparum IgG from baseline to post-immunization (day prior to CHMI), as measured by ELISA.	Group 3: from baseline until day prior to CHMI (approximately 15 weeks after first Pb(PfCS@UIS4) immunization)