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Triple Artemisinin-baseret kombinationsterapi til at forsinke udvikling af lægemiddelresistens - et randomiseret klinisk forsøg (3ACT)

18. september 2026 opdateret af: Billy Ngasala, Muhimbili University of Health and Allied Sciences

Kan Triple Artemisinin-baseret kombinationsterapi til behandling af ukompliceret Plasmodium Falciparum Malaria, forsinke udviklingen af ​​lægemiddelresistens af Plasmodium Falciparum i Tanzania: et randomiseret tre-arms klinisk forsøg

Background: Artemisinin resistance has emerged in parts of Southeast Asia, and there are reports in Africa of reduced susceptibility of Plasmodium falciparum parasites against artemisinin-based combination therapy (ACT). No new drugs are available in the pipeline to replace ACTs in case they fail.

This study aims to assess whether a sequential administration of triple ACTs with different partner-drugs can improve the efficacy of ACT for treatment of uncomplicated malaria.

Methods: A health facility-based, three-arm partially blinded randomized clinical trial will be conducted to assess efficacy and safety of a sequential administration of artemether-lumefantrine followed immediately by artesunate-amodiaquine (AL+ASAQ) or artemether-lumefantrine with by amodiaquine (AL+AQ) compared to artemether-lumefantrine plus placebo (AL+PBO). Eligible children aged 6 - 120 months and with microscopy confirmed uncomplicated P. falciparum malaria will be enrolled, administered with trial medicines and followed-up at 0 (just prior to first drug intake) and 8 hours on day 0, 12 hourly on days 1, 2, 3, 4, 5, followed by once daily on days 6, 7, 8, 9, 10, 11, 12, 13, 14, 21, 28, 35, 42 and 56 for clinical and laboratory evaluations. Clinical evaluation will involve assessment of signs and symptoms related to the disease and or trial medicine during follow-up. Laboratory evaluation will include microscopic determination of presence of malaria parasites and species, hemoglobin level, molecular analysis for markers of drug resistance and to differentiate recrudescence from new infection. The primary outcome will be crude recurrent parasitemia by day 42 in the respective arms.

Expected outcomes: The findings will give an insight on whether 3 ACTs are more efficacious than the use of first-line regimen alone, and are tolerable for treatment of uncomplicated falciparum malaria.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

384

Fase

  • Fase 2
  • Fase 3

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

    • Dar esSalaam
      • Bagamoyo, Dar esSalaam, Tanzania, 255
        • Kibindu
    • Yombo
      • Bagamoyo, Yombo, Tanzania, +255
        • Yombo Dispensary

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

6 måneder til 10 år (Barn)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Alle

Beskrivelse

Patients presenting at the health facility with suspected acute uncomplicated malaria will be screened for eligibility.

Inclusion Criteria:

  • Age from 6 - 120 months
  • Weight ≥ 5 kg
  • Body temperature ≥37.5°C or history of fever in the last 24 hours
  • Microscopy confirmed P. falciparum mono-infection
  • Parasitemia level of 1000-200000/μL
  • Ability to swallow oral medication
  • Ability and willingness to abide by the study protocol and the stipulated follow-up visits
  • A written proxy informed consent from a parent/guardian

Exclusion Criteria:

  • Children aged below 6 months will not be included in the study because ACTs are contraindicated in this group.
  • Evidence of severe malaria or danger signs
  • Known allergy to trial medicines
  • Reported antimalarial intake ≤2 weeks
  • Haemoglobin <5 g/dL
  • Blood transfusion within last 90 days
  • Febrile condition other than malaria
  • Known underlying chronic or severe disease (including severe malnutrition).

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: Randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Dobbelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: Artemether-lumefantrine followed by artesunate amodiaquine

a standard 3-days dosage, twice a day course of Artemether-Lumefantrine (20/120mg) immediately followed by a standard 3-days, once a day course of Artesunate-Amodiaquine (40base)

AL will be given twice a day for three days then followed by artesunate amodiaquine once a day for three days

Andre navne:
  • AL derefter ASAQ
Eksperimentel: Artemether-lumefantrine with Amodiaquine

a standard 3-days dosage of Artemether-Lumefantrine (20/120mg) given together with Amodiaquine hydrocloride(40 base) followed by placebo for another 3 days;

AL and AQ will be given together for three days then followed by placebo for three days

Andre navne:
  • AL+AQ
Aktiv komparator: Artemether-Lumefantrine alone

a standard 3-days dosage of Artemether-Lumefantrine (20/120mg) followed by placebo for another 3 days

This will be the comparator arm as standard treatment, where only AL will be given twice a day for three days then placebo for three days

Andre navne:
  • AL + Placebo

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Crude recurrent parasitemia by day 42 in the respective arms
Tidsramme: 42nd day since enrollment

Laboratory assessment of parasitemia using light microscopy performed at 42nd day of follow up will be the primary outcome assessing the differences in proportion of patients with recurrent parasitemia.

42nd day since enrollment

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
PCR adjusted cure rates by day 28, 42 and 56.
Tidsramme: Through study completion, an average of 1 year

Assessment of cure rate as determined by parasitemia to distinguish recrudescence and reinfections

Through study completion, an average of 1 year
Crude recurrent parasitemia by day 28 and 56 in the respective arms
Tidsramme: Day 28 and day 56 since enrollment

Laboratory assessment of parasitemia using light microscopy performed at day 28 and the last day (56th) of follow up will be the primary outcome assessing the differences in proportion of patients with recurrent parasitemia.

Day 28 and day 56 since enrollment

Andre resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Median time to recurrent parasitemia by microscopy
Tidsramme: 56 days since enrolment

This outcome compares across the three arms how long it takes until patients return with parasitemia. It will provide information on the post treatment prophylaxis of each arm.

56 days since enrolment
PCR determined parasite clearance times
Tidsramme: Baseline to day 3

PCR determined parasite clearance times are determined by using PCR to measure the amount of parasite DNA in the patient's blood at various time points after treatment. The parasite clearance time is then calculated as the time it takes for the amount of parasite DNA to fall below a certain threshold level, indicating that the parasite has been cleared from the patient's blood.

Baseline to day 3
Maximum plasma concentrations (Cmax) of the intervention drugs.
Tidsramme: Baseline and Day 7

The Pharmacokinetics profiles of artesunate/dihydroartemisinin, lumefantrine/desbutyl-lumefantrine and amodiaquine/desethyl-amodiaquine will be assessed, focusing on Plasma concentrations to determine Cmax.

Baseline and Day 7
Change in hemoglobin level (g/dl)
Tidsramme: Baseline and day 7

Haemoglobin concentration will be measured at baseline day 0 on day 7 to determine whether patients are anemic or not. . Anemia will be categorized as mild (Hb < 11 g/dL), moderate (< 7 g/dL) or severe (Hb < 5 g/dL).

Baseline and day 7
Proportion of Microscopy determined gametocyte carriage
Tidsramme: Baseline and day 3

Assessment of how many patients in each treatment arm harbour gametocytes

Baseline and day 3
Prevalence of genetic markers of drug resistance.
Tidsramme: Through study completion, an average of 1 year

Selection of genetic markers of drug resistance among recurrent parasitemia during follow-up and during the early treatment phase. The markers will include P. falciparum chloroquine resistance transporter gene (Pfcrt), and P. falciparum multidrug resistance gene 1 (Pfmdr1) for lumefantrine and amodiaquine; P. falciparum multidrug resistance proteins, the sarco/endoplasmic reticulum Ca2+-ATPase orthologue of P. falciparum (pfatp6), and P. falciparum kelch propeller gene 13 (PfKelch13) for artemisinin; and plasmepsin 2 and 3 for piperaquine.

Through study completion, an average of 1 year

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Samarbejdspartnere

Efterforskere

  • Ledende efterforsker: Billy E Ngasala, PhD, Muhimbili University of Health and Allied Sciences
  • Ledende efterforsker: Andreas Mårtensson, PhD, Muhimbili University of Health and Allied Sciences

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

1. maj 2023

Primær færdiggørelse (Faktiske)

30. december 2024

Studieafslutning (Faktiske)

1. januar 2025

Datoer for studieregistrering

Først indsendt

1. februar 2023

Først indsendt, der opfyldte QC-kriterier

28. februar 2023

Først opslået (Faktiske)

13. marts 2023

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

23. september 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

18. september 2026

Sidst verificeret

1. september 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • 3ACT-2023

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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