IMPROV (Improving the Radical Cure of Vivax Malaria)
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|ClinicalTrials.gov Identifier: NCT01814683|
Recruitment Status : Completed
First Posted : March 20, 2013
Last Update Posted : September 17, 2019
The main determinant of primaquine efficacy is the total dose of primaquine administered, rather than the dosing schedule. Previous trials have demonstrated that the standard low dose regimen of primaquine (3.5 mg/kg total) fails to prevent relapses in many different endemic locations. For this reason the 2010 WHO antimalarial guidelines now recommend a high dose regimen of 7 mg/kg (equivalent to an adult dose of 30mg per day), although many countries still recommend lower doses for fear of causing more serious harm to unscreened G6PDd patients.
Shorter courses of higher daily doses of primaquine have the potential to improve adherence and thus effectiveness without compromising efficacy. Primaquine also has relatively weak but clinically relevant asexual stage activity against P. vivax so larger daily doses may substantially augment chloroquine's blood stage activity at low levels of resistance. In Thailand directly observed primaquine (1mg/kg/day) administered over 7 days was well tolerated and reduced relapses by day 28 to 4%. This is encouraging but not definitive since many relapses present after one month. Longer follow-up is needed to distinguish whether relapse was prevented or deferred. If the efficacy, tolerability and safety of short-course, high-dose primaquine regimens can be assured across the range of endemic settings, along with reliable point-of-care G6PDd diagnostics, then this new primaquine regimen would be a major advance in malaria treatment improving adherence to and thus the effectiveness of anti-relapse therapy.
Due to the long duration of standard primaquine treatment regimens, courses are difficult to supervise, are poorly adhered to and lack effectiveness. This proposed multicentre randomised clinical trial will provide evidence across a variety of endemic settings on the safety and efficacy of high dose-short course primaquine in G6PD normal patients. In a parallel single arm study the investigators will also gather safety data on the use of weekly primaquine in patients with G6PDd. This study aims to generate evidence that will directly inform global public health policy for the radical cure of P. vivax. A better understanding of the risks and benefits of primaquine is crucial in persuading policy makers and clinicians of the importance of the radical cure of vivax malaria that will reduce the parasite reservoir and decrease transmission.
The funder is Medical Research Council, UK. Grant number: MRC Reference: MR/K007424/1
|Condition or disease||Intervention/treatment||Phase|
|Uncomplicated Vivax Malaria||Drug: Primaquine Drug: Placebo||Not Applicable|
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||2388 participants|
|Intervention Model:||Parallel Assignment|
|Masking:||Triple (Participant, Care Provider, Investigator)|
|Official Title:||Improving the Radical Cure of Vivax Malaria: A Multicentre Randomised Comparison of Short and Long Course Primaquine Regimens|
|Actual Study Start Date :||July 2014|
|Actual Primary Completion Date :||February 28, 2018|
|Actual Study Completion Date :||February 28, 2018|
Experimental: Primaquine 7 day
Standard blood schizontocidal therapy plus 7 days of supervised primaquine (7mg/kg total dose) administered once per day (1.0 mg/kg OD) followed by 7 days of placebo.
7 days of supervised primaquine (7mg/kg total dose) administered once per day (1.0 mg/kg OD) followed by 7 days of placebo.
Placebo Comparator: Placebo controlled arm
Standard blood schizontocidal therapy plus 14 days placebo.
14 days placebo.
Active Comparator: Primaquine 14 day
Standard blood schizontocidal therapy plus 14 days of supervised primaquine (7mg/kg total dose) administered once per day (0.5 mg/kg).
14 days of supervised primaquine (7mg/kg total dose) administered once per day (0.5 mg/kg).
- Incidence rate (per person-year) of symptomatic recurrent P. vivax [ Time Frame: 12 months ]The incidence rate (i.e. per person-year) of symptomatic recurrent P. vivax parasitaemia (detected by microscopy) over 12 months of follow-up in the 7 versus 14-day primaquine groups for all sites combined and stratified by site.
- The incidence rate (per person-year) of any recurrent P. vivax malaria. [ Time Frame: 12 months ]The incidence rate (per person-year) of any recurrent (i.e. symptomatic and asymptomatic) P. vivax parasitaemia over 12 months of follow-up in the 7 and 14-day primaquine regimens for all sites combined and stratified by site.
- Incidence risk of any recurrent symptomatic of P. vivax malaria compared to control arm [ Time Frame: 12 months ]The incidence rate (per person-year) of any recurrent symptomatic P. vivax parasitaemia over 12 months of follow-up in either the 7 or the 14-day primaquine regimens compared with the control arm, for all sites combined and stratified by site.
- The Haematological recovery in patients with vivax malaria [ Time Frame: 12 months ]Haematological recovery will be assessed as the incidence risk of severe anaemia (Hb<7g/dl) and/or blood transfusion within the 12 month follow up period, and the mean fall in baseline Hb at day 7 and day 14. These outcomes will be compared between the intervention arms and also between each intervention arm and the controls.
- Proportion of patients with Serious Adverse Drug reactions [ Time Frame: 12 months ]The proportion of patients with one or more serious adverse drug reactions within 42 days of their primary treatment and also at 6 and 12 months.
- Primaquine tolerability [ Time Frame: 14 days ]Tolerability of primaquine will be assessed by comparing the proportion of patients with nausea, vomiting, abdominal pain and vomiting of a dose within 1 hour of administration between the intervention arms and also between each intervention arm and the controls.
- Primaquine tolerability comparison between patients in intervention arm and control arm [ Time Frame: 14 days ]Drug tolerability will be assessed also by comparing the proportion of patients completing a full course of observed primaquine therapy between the intervention arms and also between each intervention arm and the controls.
- Incidence risk of severe anaemia in G6PD deficient arm [ Time Frame: 14 days ]- The G6PD deficiency treatment arm will provide important data on the safety and tolerability of the WHO recommended weekly regimen. The incidence risk of severe anaemia (Hb<7g/dl) and/or requirement for blood transfusion within the 12 month follow up period and the mean fall in baseline Hb at day 7 and day 14 will be determined.
- Cost effective analysis in the management of P. vivax with respect to the use of G6PD tests [ Time Frame: 12 months ]The cost of illness will be compared between the intervention arms and also between each intervention arm and the controls. A cost-effectiveness analysis for the management of P. vivax with respect to the use of G6PD tests, the dosing schedule and the epidemiological context will be conducted.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01814683
|Provincial Malaria & Leishmania control program (PMLCP) Nangarhar|
|Jalalabad, Nangarhar, Afghanistan|
|Laghman Provincial Hospital|
|Metahara Sugar Factory Hospital|
|Metahāra, Oromia, Ethiopia|
|Arba Minch Hospital|
|Ārba Minch, Snnpr, Ethiopia|
|Hanura Health Center|
|Bandar Lampung, Lampung, Indonesia|
|Tanjong Leidong District Health Center|
|Medan, North Sumatra, Indonesia, 20156|
|Dak O and Bu Gia Map Health Communes|
|Binh Phuoc, Binh Phuoc Province, Vietnam|
|Krong Pa Hospital|
|Krông Pa, Gia Lai, Vietnam|
|Principal Investigator:||Ric Price, FRCP||University of Oxford|