Efficacy and Safety of Dihydroartemisinin/Piperaquine (Artekin®) for the Treatment of Uncomplicated Malaria in Peru

Condition(s) targeted: Malaria

Intervention: Dihydroartemisinin/piperaquine VS. Mefloquine + Artesunate (Drug)

Phase: Phase 3

Status: Completed

Sponsored by: Institute of Tropical Medicine, Belgium

Official(s) and/or principal investigator(s):
Umberto D'Alessandro, MD,MSc, PHD, Study Director, Affiliation: Institute of Tropical Medicine, Antwerp

In Peru, Mefloquine plus Artesunate (MAS3), is the current first line treatment for P. falciparum malaria in the Amazonian Region, and has proved its efficacy against multi-resistant P. falciparum parasites, but several side effects have been reported. Dihydroartemisinin-piperaquine (DHA-PPQ) is a new co-formulated and well tolerated ACT, increasingly used in Southeast Asia where it has proved to be highly effective against Plasmodium falciparum malaria. We tested the efficacy, safety and tolerability of DHA-PPQ in patients with uncomplicated P. falciparum malaria. A RCT to evaluate DHA-PPQ was carried out, between 2003 and 2005. Patients with uncomplicated P. falciparum malaria were randomly allocated to receive either DHA-PPQ or MAS3 with a 63-day follow-up period. Five hundred twenty two patients were included in the analysis, 262 were allocated to receive DHA-PPQ, and 260 to receive MAS3. The two groups were comparable at baseline in demographic and clinical characteristics. The mean time for parasite clearance into the DHA-PPQ group was 32. 0 hours and 35. 5 hours in the MAS3 group. Twenty-four hours after the first dose, the proportions of patients whose cleared parasitaemia were 67. 2% in the DHA-PPQ group, and 58. 1% in the MAS3 group (RR 1. 25, [95% CI 1. 03−1. 52], p = 0. 017). All patients were able to clear parasites within 72 hours after the first dose. The mean time for fever clearance was 28. 0 and 29. 5 hours in DHA-PPQ and MAS3 group respectively. (P= 0. 69). Twenty-four hours after the first dose, 85. 5% and 83. 1% of patients cleared fever in the DHA-PPQ and MAS3 group respectively (p>0. 05). The Adequate Clinical and Parasitological Response (ACPR), PCR adjusted, were 97. 7% and 99,2% for the DHA-PPQ and MAS3 group respectively, (RR 0. 99, 95% CI [0. 86−1. 13], P = 0. 88). No Early Treatments Failures were reported in any group. In the DHA-PPQ group, according to the PCR adjusted results, 6 subjects had Late treatment Failures. In the MAS3 group, two Late Treatment Failures was reported. The frequency of adverse events was significantly lower in patients treated with DHA-PPQ than in those treated with MAS3.

DHA-PPQ proved to be a highly effective antimalarial drug for the treatment of P. falciparum malaria and suitable for use in the Peruvian Amazon region. It also has the advantage of being better tolerated. In terms of cost, DHA-PPQ is cheaper and more affordable than MAS3 and should be considered for the National Antimalarial Drug Policy in Perú.

Official title: Phase 3a: Efficacy, Safety, and Tolerability of Dihydroartemisinin/Piperaquine (Artekin®) for the Treatment of Uncomplicated Plasmodium Falciparum Malaria in the Peruvian Amazon Region

Study design: Treatment, Randomized, Open Label, Active Control, Parallel Assignment, Safety/Efficacy Study

Primary outcome: Adequate Clinical and parasitological response at day 63

Secondary outcome:

Recrudescence till day 63

Reinfections till day 63

SAE till day 63

AE till day 63

Minimum age: 5 Years. Maximum age: 60 Years. Gender(s): Both.

Criteria:

Inclusion Criteria:

- Age: 5 - 60 years old

- Fever (axillary temperature  37,5 °C) or history of fever in the previous 24 hours

- Monoinfection with P. falciparum, with parasitic density between 1,000 and 200,000

par/µl

- Informed consent provided by patient or parent or legal tutor

• Exclusion criteria:

- Mixed malaria infection

- Pregnancy or breastfeeding to child ≤ 6 months of age

- One or more danger signs or any sign of severe or complicated malaria

- A concomitant severe disease

- History of treatment with mefloquine in the last 60 days or chloroquine, primaquine or

quinine within the 14 days before the present episode

- History of neuropsychiatric disease

- History of hypersensitivity reactions to artemisinins or mefloquine

- History of splenectomy

Starting date: July 2003
Ending date: July 2005
Last updated: September 7, 2006