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P. Falciparum MalariaRDMNCT01640587

Compare the Effectiveness Between Existing Treatment and New Treatment

A study testing Mefloquine+Artesunate and Dihydroartemisinin-Piperaquine in people with P. Falciparum Malaria, run by University of Oxford at 1 site in Thailand.

Terminated

Stopped early. The study ended before it was planned to and will not resume.

Official record
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Trial summary

In camps for displaced persons located along the Thai-Myanmar border, mefloquine and artesunate combination therapy has been used since 1992. In vivo efficacy of a 3 day regimen of mefloquine + artesunate (MAS3) has been monitored regularly since its introduction in 1992. Read more about this study

Who is it for?
Ages 5 years and older
Conditions the study is for
P. Falciparum Malaria
What is being tested?
Mefloquine+Artesunate and Dihydroartemisinin-Piperaquine
Type of treatment
Pill or oral medicine
Could I receive a placebo?
No, everyone receives an active treatment
How many people
76 participants
Where
1 siteThailand
Study dates
Nov 2013to 30 Mar 2017
Phase
Interventional
Are there results?
None posted in the registry

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 5 years and older
  • All sexes
  • No healthy volunteers
  • Child, Adult, Older adult

Who may be able to join

  • Age ≥ 5 years
  • Symptomatic of malaria infection, i.e. history of fever or presence of fever >37.5°c.
  • microscopically confirmed asexual stages of Plasmodium falciparum ≥ 5/500 wbc (may be mixed with non- P.falciparum species) .
  • Written informed consent given to participate in the trial.
  • Participant or parent/guardian is willing and able to give informed consent for participation in the study.
  • Participant or guardian is able to understand and participant can complete the study requirements

Who cannot join

  • Pregnancy or lactation (urine test for β HCG to be performed on any woman of child bearing age unless menstruating).
  • P.falciparum asexual stage parasitaemia greater than or equal to 4% red blood cells (175 000/µL).
  • Signs or symptoms indicative of severe malaria:
  • Impaired consciousness
  • Severe anaemia (Hct<15%)
  • Bleeding disorder -evidenced by epistaxis, bleeding gums, frank haematuria, bleeding from venepuncture sites.
Show all 12Show fewer
  • Respiratory distress
  • Severe jaundice
  • Patients who received any P. falciparum treatment within 2 months
  • Known hypersensitivity to artemisinins - defined as history of erythroderma/ other severe cutaneous reaction, angioedema or anaphylaxis.
  • History of epilepsy and other neurological disorders
  • Splenectomy

Trial locations and contacts

1 site in 1 country.

Thailand1 site
  • Shoklo Malaria Research Unit

    Mae Sot, Changwat Tak, 63110

Other trials in Thailand

About this study

Official title: Randomized Open-label Trial of Comparison Between DHA-Piperaquine and Mefloquine Artesunate Combinations 3 Day-regimens for the Treatment of Uncomplicated Plasmodium Falciparum Malaria on the Thai-Myanmar Border (RDM)

In camps for displaced persons located along the Thai-Myanmar border, mefloquine and artesunate combination therapy has been used since 1992. In vivo efficacy of a 3 day regimen of mefloquine + artesunate (MAS3) has been monitored regularly since its introduction in 1992. In 2009 Carrara et al summarised the in vivo PCR-adjusted cure rates at Day 42 and Day 63 in patients treated with MAS3 between 1995 and 2005, as well as the in-vitro parasite susceptibility to MAS3 during that same period, and the changes in pfmdr1 copy numbers.The proportion of patients with parasitaemia persisting on day-2 increased significantly from 4.5% before 2001 to 21.9% after 2002 (p<0.001). Delayed parasite clearance was associated with increased risk of developing gametocytaemia (AOR = 2.29; 95% CI, 2.00-2.69, p = 0.002). MAS3 efficacy declined slightly but significantly (Hazards ratio 1.13; 95% CI, 1.07-1.19, p<0.001), although efficacy in 2007 remained well within acceptable limits: 96.5% (95% CI, 91.0-98.7). The proportion of infections caused by parasites with increased pfmdr1 copy number rose from 30% (12/40) in 1996 to 53% (24/45) in 2006 (p = 0.012, test for trend).

Evidence of reduced susceptibility to artemisinins in Western Cambodia was first reported in January 2007. Artemisinin resistance was manifest by a marked slowing of parasite clearance. A more recent analysis of parasite clearance data collected prospectively in patients with uncomplicated hyperparasitaemic malaria has shown a progressive decline in parasite clearance rates over the last decade suggesting a decline following the same trajectory as in Western Cambodia but with a time lag of a few years.

Read more

Surveillance data collected in 2011 have shown a dramatic and worrying decline in efficacy of MAS3, albeit in a small number of patients. This decline in efficacy of mefloquine + artesunate is likely to be attributable to reduced parasite susceptibility to mefloquine. The other fixed dose combinations available dihydroartemisinin-piperaquine (DP) is the best option to replace mefloquine-artesunate since it is thought that it remains effective in the presence of high pfmdr1 copy numbers. In addition DP is administered once daily and needs no special dietary modification to ensure adequate absorption.

In this study it is hypothesised that efficacy of DP (estimated to be 95%) will be significantly higher than that of MAS3 (estimated to be 65%), therefore the investigators propose to conduct a randomised controlled trial between DP and MAS3 for the treatment of P.falciparum.

Read the detailed description

In camps for displaced persons located along the Thai-Myanmar border, mefloquine and artesunate combination therapy has been used since 1992. It was studied first in trials, but by 1994 it became the first line treatment for all uncomplicated P. falciparum malaria episodes in the non-pregnant population. In vivo efficacy of a 3 day regimen of mefloquine+ artesunate (MAS3) has been monitored regularly since its introduction in 1992. In 2009 Carrara et al summarised the in vivo PCR-adjusted cure rates at Day 42 and Day 63 in patients treated with MAS3 between 1995 and 2005, as well as the in-vitro parasite susceptibility to MAS3 during that same period, and the changes in pfmdr1 copy numbers.The proportion of patients with parasitaemia persisting on day-2 increased significantly from 4.5% before 2001 to 21.9% after 2002 (p<0.001). Delayed parasite clearance was associated with increased risk of developing gametocytaemia (AOR = 2.29; 95% CI, 2.00-2.69, p = 0.002). MAS3 efficacy declined slightly but significantly (Hazards ratio 1.13; 95% CI, 1.07-1.19, p<0.001), although efficacy in 2007 remained well within acceptable limits: 96.5% (95% CI, 91.0-98.7). The proportion of infections caused by parasites with increased pfmdr1 copy number rose from 30% (12/40) in 1996 to 53% (24/45) in 2006 (p = 0.012, test for trend).

Evidence of reduced susceptibility to artemisinins in Western Cambodia was first reported in January 2007. Artemisinin resistance was manifest by a marked slowing of parasite clearance. In Pailin, Cambodia, the median parasite clearance time was 84 hours compared to 48 hours on the Thai side of the international border with Myanmar following either 2 mg/kg of artesunate (AS) alone for 7 days or 4 mg/kg AS for 3 days plus 25 mg/kg of mefloquine at both locations. A more recent analysis of parasite clearance data collected prospectively in patients with uncomplicated hyperparasitaemic malaria has shown a progressive decline in parasite clearance rates over the last decade suggesting a decline following the same trajectory as in Western Cambodia but with a time lag of a few years.

Clinic experience data collected in 2011 have shown a steady decline in efficacy of MAS3, albeit in a small number of patients. We have observed this trend over the past 10 years. It appears to be related to the increased copies of the gene Pfmdr1 in adult males. The PCR corrected efficacy in 43 patients was 47.0% (95% CI 27.0-64.7), well below the 90% threshold at which WHO recommends changing to an alternative treatment. This decline in efficacy of mefloquine + artesunate is likely to be attributable to reduced parasite susceptibility to mefloquine. The other fixed dose combinations available dihydroartemisinin-piperaquine (DP) is the best option to replace mefloquine-artesunate since it is thought that it remains effective in the presence of high pfmdr1 copy numbers. In addition DP is administered once daily and needs no special dietary modification to ensure adequate absorption.

However other groups in the area have documented a good efficacy of MAS3. In other words we think there is a decline in efficacy but we do not feel confident to say what the magnitude of this drop is. Changing policy is a difficult task and we need more and stronger evidence of the current efficacy of MAS3. The best design to avoid selection bias is to do an adequately powered randomized control trial and we would like to compare MAS3 with the next generation ACT: DP. We have already conducted studies with DP and we know it is safe and effective. In laboratory studies we found that this treatment (DP) is more effective against P.falciparum when it exhibits resistance to mefloquine via increased expression of the Pfmdr1 gene. We think it is timely to compare MAS3 and DP again and carefully monitor for the treatment response in patients with signs of mefloquine resistant parasites. Therefore, we propose a study to evaluate in an adequately powered RCT MAS3 (the current national policy for Thailand and routinely use along the border) to a potential replacement, DP.

Due to a lack of malaria patients at clinics, the trial was terminated. There will be no further analysis and or publication of the results.

Being tested
Mefloquine+Artesunate, Dihydroartemisinin-Piperaquine
Keywords
Uncomplicated falciparum infection, Mefloquine-artesunate, Dihydroartemisinin-piperaquine

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Mefloquine+ArtesunateDrug

    Also called Eloquine®

    One tablet of artesunate contains 40mg (Guilin Pharmaceutical Company, PRC). One tablet of mefloquine contains 250 mg mefloquine (Eloquine® (Medochemie Ltd., Cyprus) Standard three days regimen of artesunate-mefloquine given as 4mg/kg artesunate/day and 8 mg/kg of mefloquine/day on Days 0, 1 and 2

  • Dihydroartemisinin-PiperaquineDrug

    Also called Duo-Cotecxin®

    DHA-Piperaquine (Duo-Cotecxin® Beijing Holley-Cotec Pharmaceuticals Co., Ltd, China) One tablet contains 40mg of dihydroartemisinin and 320 mg piperaquine. A weight-based regimen containing 2.4 mg/kg DHA and 20 mg/kg PPQ once daily for 3 days

Study groups in NCT01640587
Study groupRoleWhat they receive
DPExperimental2.4 mg/kg dihydroartemisinin AND 20 mg/kg piperaquine once daily on Days 0, 1 and 2
Receives: Drug: Dihydroartemisinin-Piperaquine
MAS3Active comparator4mg/kg artesunate AND 8 mg/kg mefloquine once daily on Days 0, 1 and 2
Receives: Drug: Mefloquine+Artesunate

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. PCR adjusted adequate clinical and parasitological response

    Day 63 PCR adjusted adequate clinical and parasitological response (ACPR) in both DP3 arm and MAS3 arm

    Measured: Day 63

Secondary outcomes (2)
  1. PCR adjusted adequate clinical and parasitological response

    Day 42 PCR adjusted adequate clinical and parasitological response (ACPR) in both DP3 arm and MAS3 arm

    Measured: Day 42

  2. Proportion of aparasitaemic

    Proportion of aparasitaemic patients on day 3 in both DP3 arm and MAS3 arm

    Measured: Day 3

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted13 Jul 2012 (estimated)
  2. Study startNov 2013
  3. Primary completionMar 2017
  4. Study completion30 Mar 2017

Why it stopped: No adequate malaria patient

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
None (open label)
Enrolment
76 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT01640587
Sponsor's protocol ID
SMRU1201
Acronym
RDM
Status last verified
Jun 2017
First submitted
11 Jul 2012
Last updated
10 Jan 2023
Results posted
No
Data monitoring committee
No

Questions about this trial

What is this clinical trial studying?

A study testing Mefloquine+Artesunate and Dihydroartemisinin-Piperaquine in people with P. Falciparum Malaria, run by University of Oxford at 1 site in Thailand.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 6 inclusion and 12 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: stopped early, as of the sponsor's last update on 10 Jan 2023. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in Thailand. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

The study was stopped early (reason given: No adequate malaria patient). Results are not available in the source record.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

PCR adjusted adequate clinical and parasitological response (time frame: Day 63). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 10 Jan 2023; AzTrials last refreshed its copy on 6 Nov 2026.

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