Single Low Dose Tafenoquine to Reduce P. Falciparum Transmission in Mali (NECTAR2)

Phase 2

Completed

• Conditions: Malaria, Falciparum
• Interventions: Drug: Dihydroartemisinin/Piperaquine; Drug: Tafenoquine 100mg [Arakoda]

• Registration Number: NCT04609098
• Lead Sponsor: London School of Hygiene and Tropical Medicine

Brief Summary

The purpose of this study is to assess the gametocytocidal and transmission reducing activity of dihydroartemisinin-piperaquine (DP) with and without various low doses of tafenoquine (TQ; 1.66mg/kg, 0.83mg/kg, or 0.415mg/kg). Outcome measures will include infectivity to mosquitoes at 2 and 7 days after treatment, gametocyte density throughout follow-up, and safety measures including haemoglobin density.

Detailed Description

Full protocol available on request.

Study Timeline

• Study First Submitted: 2020-10-26
• Study Start: 2020-10-29
• Study First Submitted QC: 2020-10-29
• Study First Posted: 2020-10-30
• Primary Completion: 2020-12-02
• Study Completion: 2020-12-23
• Status Verified: 2022-06
• Last Update Submitted: 2022-06-07
• Last Update Posted: 2022-06-09

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 80

Inclusion Criteria

• Age ≥ 12 years and ≤ 50 years
• Glucose 6 phosphate dehydrogenase (G6PD) normal status defined by Carestart rapid diagnostic test or the G6PD qualitative test (OSMMR2000)
• Absence of symptomatic falciparum malaria, defined by fever on enrolment
• Presence of P. falciparum gametocytes on thick blood film at a density >16 gametocytes/µL (i.e. ≥ gametocytes recorded in the thick film against 500 white blood cells)
• Absence of other non-P. falciparum species on blood film
• No allergies to study drugs
• No use of antimalarial drugs over the past 7 days (as reported by the participant)
• Hemoglobin ≥ 10 g/dL
• Individuals weighing < = 80 kg
• No evidence of acute severe or chronic disease
• Written, informed consent

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Exclusion Criteria

• Age < 12 years or > 50 years
• Women who are pregnant or lactating
• Blood thick film negative for sexual stages of malaria
• Detection of a non-P. falciparum species by microscopy
• Previous reaction to study drugs / known allergy to study drugs
• Signs of severe malaria, including hyperparasitemia (defined as asexual parasitemia > 100,000 parasites / µL)
• Signs of acute or chronic illness, including hepatitis
• The use of other medication (with the exception of paracetamol and/or aspirin)
• Consent not given
• G6PD-deficiency by Carestart rapid diagnostic test or the OSMMR2000 G6PD qualitative test
• Use of antimalarial drugs over the past 7 days (as reported by the participant)
• The use of other medication (with the exception of paracetamol and/or aspirin)
• Clinically significant illness (intercurrent illness e.g. pneumonia, pre-existing condition e.g. renal disease, malignancy or conditions that may affect absorption of study medication e.g. severe diarrhea or any signs of malnutrition as defined clinically)
• Signs of hepatic injury (such as nausea and/or abdominal pain associated with jaundice) or known severe liver disease (i.e. decompensated cirrhosis, Child Pugh stage B or C)
• Signs, symptoms or known renal impairment
• Clinically significant abnormal laboratory values as determined by history, physical examination or routine blood chemistries and hematology values (laboratory guideline values for exclusion are hemoglobin < 10 g/dL, platelets < 50,000/μl, White Blood Cell count (WBC) < 2000/μl, serum creatinine >2.0mg/dL, or ALT or AST more than 3 times the upper limit of normal for age.
• Family history of diseases leading to QT prolongation or recent treatment with drugs linked to QT prolongation
• Blood transfusion in the last 90 days.
• Consistent with the long half-life of tafenoquine, effective contraception should be continued for 5 half-lives (3 months) after the end of treatment.
• History of psychiatric disorders

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
DP with 0.415mg/kg Tafenoquine (TQ)	Tafenoquine 100mg [Arakoda]	Subjects will receive Dihydroartemisinin-Piperaquine (DP) once daily for 3 days, and a single dose of 0.415mg/kg Tafenoquine (TQ) on the first date of DP treatment.
DP with 0.83 mg/kg TQ	Tafenoquine 100mg [Arakoda]	Subjects will receive Dihydroartemisinin-Piperaquine (DP) once daily for 3 days, and a single dose of 0.83mg/kg Tafenoquine (TQ) on the first date of DP treatment.
Dihydroartemisinin-Piperaquine (DP)	Dihydroartemisinin/Piperaquine	Subjects will receive Dihydroartemisinin-Piperaquine (DP) once daily for 3 days, and a low dose of 1.66mg/kg, 0.83mg/kg, or 0.415mg/kg. Tafenoquine (TQ) on the first date of DP treatment.
DP with 1.66mg/kg TQ	Dihydroartemisinin/Piperaquine	Subjects will receive Dihydroartemisinin-Piperaquine (DP) once daily for 3 days, and single dose of 1.66mg/kg Tafenoquine (TQ) on the first date of DP treatment.
DP with 0.83 mg/kg TQ	Dihydroartemisinin/Piperaquine	Subjects will receive Dihydroartemisinin-Piperaquine (DP) once daily for 3 days, and a single dose of 0.83mg/kg Tafenoquine (TQ) on the first date of DP treatment.
DP with 0.415mg/kg Tafenoquine (TQ)	Dihydroartemisinin/Piperaquine	Subjects will receive Dihydroartemisinin-Piperaquine (DP) once daily for 3 days, and a single dose of 0.415mg/kg Tafenoquine (TQ) on the first date of DP treatment.
DP with 1.66mg/kg TQ	Tafenoquine 100mg [Arakoda]	Subjects will receive Dihydroartemisinin-Piperaquine (DP) once daily for 3 days, and single dose of 1.66mg/kg Tafenoquine (TQ) on the first date of DP treatment.

Primary Outcome Measures

Name	Time	Method
Change in mosquito infectivity assessed through membrane feeding assays (day 7)	2 days (Days 0 & 7): 7 day span	The proportion of mosquitoes infected, assessed through membrane feeding and measured as oocyst prevalence in mosquitoes dissected on day 7 post feed, compared to baseline

Secondary Outcome Measures

Name	Time	Method
Mosquito infection density assessed through membrane feeding assays	4 days (Days 0, 2, 7 & 14): 14 day span	Mosquito infection density, assessed through membrane feeding and measured as oocyst density in mosquitoes dissected on day 2, 7 and 14 post feed, compared within and between study arms
Mosquito infection prevalence assessed through membrane feeding assays	4 days (Days 0, 2, 7 & 14): 14 day span	Mosquito infection prevalence and density, assessed through membrane feeding and measured as oocyst prevalence in mosquitoes dissected on day 2, 7 and 14 post feed, compared within and between study arms
Haemoglobin density	7 days (Days 0, 1, 2, 7, 14, 21 & 28): 28 day span	Haemolysis will be monitored by measuring haemoglobin levels (g/dL) on days 0, 1, 2, 7, 14, 21, and 28 post treatment as part of the clinical assessment.
Blood creatinine level	7 days (Days 0, 1, 2, 7, 14, 21 & 28): 28 day span	Blood creatine level will be recorded on days 0, 1, 2, 7, 14, 21, and 28 post treatment as part of the clinical assessment.
Asexual/sexual stage parasite prevalence	7 days (Days 0, 1, 2, 7, 14, 21 & 28): 28 day span	Asexual/sexual stage parasite prevalence will be measured by microscopy and by molecular methods on days 0, 1, 2, 7, 14, 21, and 28 post treatment.
Change in mosquito infectivity assessed through membrane feeding assays (days 2 and 14)	3 days (Days 0, 2, & 14): 14 day span	The proportion of mosquitoes infected, assessed through membrane feeding and measured as oocyst prevalence in mosquitoes dissected on day 2 and 14 post feed, compared to baseline
Human infectivity assessed through membrane feeding assays	4 days (Days 0, 2, 7 & 14): 14 day span	The proportion of individuals that infect any number of mosquitoes, assessed through membrane feeding and measured as oocyst prevalence/density in mosquitoes dissected on day 2, 7 and 14 post feed, compared within and between study arms
Methmoglobin density	7 days (Days 0, 1, 2, 7, 14, 21 & 28): 28 day span	Methmoglobin density (g/dL) will be monitored on days 0, 1, 2, 7, 14, 21, and 28 post treatment as part of the clinical assessment.
Asexual/sexual stage parasite density	7 days (Days 0, 1, 2, 7, 14, 21 & 28): 28 day span	Asexual/sexual stage parasite density (parasites/microlitre) will be measured by microscopy and by molecular methods on days 0, 1, 2, 7, 14, 21, and 28 post treatment.
Asexual/sexual stage parasite circulation time	28 days	Asexual/sexual stage parasite circulation time (days) will be determined from measures of density.
Incidence of adverse events	7 days (Days 0, 1, 2, 7, 14, 21 & 28): 28 day span	Incidence of adverse events will be monitored at each active (day 0,1,2,7,14,21,28) follow up visit. AE's will also be recorded and acted upon if present at any other time during follow up.
Aspartate transaminase (AST)/alanine transaminase (ALT) ratio	7 days (Days 0, 1, 2, 7, 14, 21 & 28): 28 day span	Aspartate transaminase (AST)/alanine transaminase (ALT) ratio will be recorded on days 0, 1, 2, 7, 14, 21, and 28 post treatment as part of the clinical assessment.
Asexual/sexual stage parasite area under the curve (AUC)	28 days	Asexual/sexual stage parasite area under the curve (AUC: Gametocytes per microlitre per day) will be determined from measures of density.
Sexual stage parasite sex ratio	7 days (Days 0, 1, 2, 7, 14, 21 & 28): 28 day span	Gametocyte density will be determined by molecular methods for males and females separately, allowing analysis of sex ratio (proportion of total that is male) on days 0, 1, 2, 7, 14, 21 and 28 post treatment.

Trial Locations

Locations (1)

Malaria Research and Training Centre; 🇲🇱 Bamako, Mali