OPTIMAL LEAP: Optimizing Dihydroartemisinin-Piperaquine IPTsc Intervals to Advance Learning, Executive Function, Attendance, and Antimalarial Resistance Surveillance in Kenyan Schoolchildren (Optimal LEAP)
2026年8月27日 更新者：Megan Song McHenry、Indiana University
OPTIMAL LEAP: Optimizing Preventive Treatment Intervals for Malaria to Advance Longitudinal Learning, Executive Function, Attendance, and Pathways
Malaria remains a major cause of illness among school-aged children in sub-Saharan Africa, many of whom carry asymptomatic Plasmodium falciparum infections that may contribute to anemia, inflammation, school absenteeism, and impaired cognitive performance.
Intermittent preventive treatment in school-aged children (IPTsc) is recommended by the World Health Organization in settings with moderate-to-high malaria transmission, but the optimal dosing frequency remains uncertain.
This cluster-randomized trial will compare monthly versus quarterly administration of dihydroartemisinin-piperaquine (DP) among 1,500 children aged 6-10 years attending six primary schools in Siaya County, Kenya.
The primary objective is to determine whether monthly IPTsc results in greater improvements in executive functioning compared with quarterly IPTsc.
Secondary objectives include evaluating effects on literacy, numeracy, school attendance, malaria infection, anemia, inflammatory and metabolic biomarkers, and molecular markers of antimalarial resistance.
調査の概要
状態
状態
まだ募集していません
条件
条件
介入・治療
介入・治療
詳細な説明
Malaria remains a leading cause of morbidity in sub-Saharan Africa, and school-aged children represent an important reservoir of asymptomatic Plasmodium falciparum infection. Although often clinically silent, persistent low-density infections have been associated with anemia, immune activation, school absenteeism, and impaired executive functioning, including working memory, inhibitory control, and cognitive flexibility. These cognitive processes are critical for learning, academic achievement, and long-term educational attainment.
The World Health Organization recommends intermittent preventive treatment for school-aged children (IPTsc) in settings with moderate-to-high malaria transmission; however, evidence is limited regarding the optimal frequency of preventive treatment. Dihydroartemisinin-piperaquine (DP) provides extended post-treatment prophylaxis and is a promising IPTsc regimen, but more frequent administration may also increase drug selection pressure and contribute to the emergence of antimalarial resistance.
This study is a two-arm, school-cluster randomized trial conducted in six primary schools in Siaya County, Kenya. A total of 1,500 children aged 6 to 10 years will be enrolled and followed for 24 months. Enrollment will be balanced across one-year age bands, with approximately 300 children per age band at baseline. Schools will be randomized to receive either monthly DP IPTsc or quarterly DP IPTsc. The primary outcome is change in executive functioning measured using the tablet-based NeuroScreen assessment platform. Secondary outcomes include literacy and numeracy performance measured using the Early Grade Reading Assessment (EGRA) and Early Grade Mathematics Assessment (EGMA), school attendance, malaria-associated absenteeism, P. falciparum parasitemia, hemoglobin levels, symptomatic malaria episodes, inflammatory biomarkers, metabolomic profiles, and molecular markers of antimalarial resistance.
The study will also investigate biological mechanisms linking asymptomatic malaria infection with cognitive outcomes. Longitudinal assessments of parasitemia, inflammatory cytokines and chemokines, metabolomic pathways, and genetic markers of parasite resistance will be performed. Resistance surveillance will include evaluation of kelch13, pfcrt, pfmdr1, pfexo, and pfplasmepsin II/III markers. Findings from this trial will provide evidence on the benefits and risks of different IPTsc dosing schedules and inform malaria prevention policies aimed at improving child health, educational achievement, and long-term developmental outcomes while minimizing the risk of antimalarial resistance.
研究の種類
研究の種類
介入
入学 (推定)
入学
1500
段階
段階
- フェーズ 3
連絡先と場所
このセクションには、調査を実施する担当者の連絡先の詳細と、この調査が実施されている場所に関する情報が記載されています。
研究連絡先
研究連絡先
- 名前：Kristen Cunningham, MPH, MS
- 電話番号：317-278-5675
- メール：kricunn@iu.edu
参加基準
研究者は、適格基準と呼ばれる特定の説明に適合する人を探します。これらの基準のいくつかの例は、人の一般的な健康状態または以前の治療です。
適格基準
適格基準
就学可能な年齢
- 子
健康ボランティアの受け入れ
はい
説明
Inclusion Criteria:
- Age 6 to 10 years at enrollment
- Enrollment in a participating primary school in Siaya County, Kenya
- Residence within the participating school's catchment area with no plans to relocate during the study period
- Parent or legal guardian able and willing to provide informed consent
- Child able and willing to provide assent, as applicable according to local regulations and age requirements
- Willingness to comply with study procedures and follow-up visits
Exclusion Criteria:
- Known hypersensitivity or contraindication to dihydroartemisinin-piperaquine (DP)
- Severe acute illness requiring urgent medical evaluation or hospitalization at enrollment
- Known cardiac disease or history of conditions associated with increased risk of QT prolongation
- Severe malnutrition requiring urgent referral or treatment
- Recent antimalarial treatment within the protocol-defined washout period
- Severe anemia (hemoglobin <7 g/dL) at screening
- Measured fever (≥38.0°C) or acute febrile illness requiring evaluation at screening
- Any medical, social, or behavioral condition that, in the opinion of the investigators, would make participation unsafe or interfere with study participation or interpretation of study results
研究計画
このセクションでは、研究がどのように設計され、研究が何を測定しているかなど、研究計画の詳細を提供します。
研究はどのように設計されていますか？
デザインの詳細
- 主な目的：防止
- 割り当て：ランダム化
- 介入モデル：並列代入
- マスキング：独身
アーム数
2
武器と介入
参加者グループ / アーム参加者グループ / アーム |
介入・治療介入・治療 |
|---|---|
|
実験的：Monthly Dihydroartemisinin-piperaquine (DP) IPTsc
Participants enrolled in schools randomized to the monthly intervention arm will receive age- or weight-basedtherapeutic course of dihydroartemisinin-piperaquine, according to protocol-defined dosing procedures, administered monthly for 24 months through a school-based intermittent preventive treatment program.
Dosing will be directly observed by study staff when administered at school; make-up dosing procedures will be used for children absent on scheduled dosing days according to the protocol.
|
Age- or weight-based dihydroartemisinin-piperaquine administered monthly for 24 months as intermittent preventive treatment in school-aged children (IPTsc).
|
|
アクティブコンパレータ：Quarterly DP IPTsc
Participants enrolled in schools randomized to the quarterly intervention arm will receive age- or weight-based therapeutic course of dihydroartemisinin-piperaquine, according to protocol-defined, dosing procedures administered every three months for 24 months through a school-based intermittent preventive treatment program.
Dosing will be directly observed by study staff when administered at school; make-up dosing procedures will be used for children absent on scheduled dosing days according to the protocol.
|
Age- or weight-based dihydroartemisinin-piperaquine administered every three months for 24 months as intermittent preventive treatment in school-aged children (IPTsc).
|
この研究は何を測定していますか？
主要な結果の測定
主要な結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
Change from baseline to 24 months in NeuroScreen Executive Function Composite z-score
時間枠：Baseline through 24 months
|
Executive function will be assessed quarterly using tablet-based NeuroScreen tasks measuring working memory, inhibitory control/attention, and cognitive flexibility.
The primary endpoint will be the adjusted change in the EF composite z-score from baseline to 24 months.
Higher scores indicate better performance.
|
Baseline through 24 months
|
二次結果の測定
二次結果の測定
結果測定 |
メジャーの説明 |
時間枠 |
|---|---|---|
|
Change from baseline to 24 months in EGRA score
時間枠：Baseline, 12 months, and 24 months
|
Literacy will be assessed using Early Grade Reading Assessment subtests adapted for the local language and educational context.
Scores will be analyzed as standardized continuous outcomes; higher scores indicate better reading performance.
|
Baseline, 12 months, and 24 months
|
|
Change from baseline to 24 months in EGMA score
時間枠：Baseline, 12 months, and 24 months
|
Numeracy will be assessed using Early Grade Mathematics Assessment subtests adapted for the local educational context.
Scores will be analyzed as standardized continuous outcomes; higher scores indicate better mathematics performance.
|
Baseline, 12 months, and 24 months
|
|
Total School Absenteeism
時間枠：Throughout 24 months of follow-up
|
Number and proportion of enrolled school days missed during the 24-month follow-up period, based on school registers and teacher confirmation.
|
Throughout 24 months of follow-up
|
|
Malaria-Associated School Absenteeism
時間枠：Throughout 24 months of follow-up
|
Number of school days missed due to suspected or confirmed malaria illness, based on study assessments, clinic records when available, and caregiver/teacher illness reports.
|
Throughout 24 months of follow-up
|
|
Prevalence of qPCR-detectable P. falciparum parasitemia
時間枠：Baseline and quarterly through 24 months
|
Presence of P. falciparum infection measured by qPCR, with microscopy used to identify patent infections
|
Baseline and quarterly through 24 months
|
|
Change in Hemoglobin Concentration
時間枠：Baseline and quarterly through 24 months
|
Hemoglobin concentration measured in g/dL at baseline and quarterly through 24 months.
|
Baseline and quarterly through 24 months
|
|
Incidence rate of symptomatic malaria episodes
時間枠：Throughout 24 months
|
Number of symptomatic malaria episodes per child-year during follow-up.
|
Throughout 24 months
|
|
Change in inflammatory cytokine and chemokine concentrations
時間枠：Baseline and quarterly through 24 months
|
Longitudinal changes in log-transformed inflammatory biomarker concentrations, including cytokines and chemokines implicated in malaria-associated cognitive outcomes.
|
Baseline and quarterly through 24 months
|
|
Change in metabolomic and lipidomic pathway scores
時間枠：Baseline and quarterly through 24 months
|
Longitudinal changes in prespecified metabolomic and lipidomic pathways related to inflammation, oxidative stress, mitochondrial energy metabolism, lipid-mediated inflammation, tryptophan-kynurenine metabolism, and iron handling.
Analyses may be conducted in a prespecified longitudinal subset, with targeted validation in the broader cohort.
|
Baseline and quarterly through 24 months
|
|
Prevalence and emergence of DP resistance-associated P. falciparum polymorphisms and copy number variants
時間枠：Baseline through 24 months
|
Molecular surveillance will assess resistance-associated markers including kelch13, pfcrt, pfmdr1, pfexo, and pfplasmepsin II/III copy number variation.
Sequence variants will be assessed using multiplex amplicon sequencing, and copy number variation will be confirmed by qPCR or ddPCR when appropriate.
|
Baseline through 24 months
|
|
Molecular force of infection
時間枠：Baseline through 24 months
|
Acquisition of new genetically distinct P. falciparum clones over time as determined by parasite diversity genotyping.
|
Baseline through 24 months
|
|
Complexity or multiplicity of infection at 12 and 24 months
時間枠：12 and 24 months
|
Complexity/multiplicity of infection will be estimated from parasite diversity markers to quantify the number of genetically distinct parasite clones within infections and compare differential protection conferred by monthly versus quarterly IPTsc.
|
12 and 24 months
|
協力者と研究者
ここでは、この調査に関係する人々や組織を見つけることができます。
協力者
協力者
捜査官
捜査官
- 主任研究者：Megan S McHenry, MD, MS、Indiana University
- 主任研究者：Eren Oyungu, MBChB, MMED、Moi University
出版物と役立つリンク
研究に関する情報を入力する責任者は、自発的にこれらの出版物を提供します。これらは、研究に関連するあらゆるものに関するものである可能性があります。
一般刊行物
- Cohee LM, Opondo C, Clarke SE, Halliday KE, Cano J, Shipper AG, Barger-Kamate B, Djimde A, Diarra S, Dokras A, Kamya MR, Lutumba P, Ly AB, Nankabirwa JI, Njagi JK, Maiga H, Maiteki-Sebuguzi C, Matangila J, Okello G, Rohner F, Roschnik N, Rouhani S, Sissoko MS, Staedke SG, Thera MA, Turner EL, Van Geertruyden JP, Zimmerman MB, Jukes MCH, Brooker SJ, Allen E, Laufer MK, Chico RM. Preventive malaria treatment among school-aged children in sub-Saharan Africa: a systematic review and meta-analyses. Lancet Glob Health. 2020 Dec;8(12):e1499-e1511. doi: 10.1016/S2214-109X(20)30325-9. Epub 2020 Oct 22.
- McHenry MS, Ayodo G, Marete I, Hasund CM, Knight V, Cunningham KB, Gaskin EL, White G, Tu W, Neafsey DE, John CC, Tran TM. Association of asymptomatic Plasmodium falciparum infections and its treatment with short-term cognitive performance in school-aged children: a prospective cohort study in western Kenya. J Infect. 2026 Aug 19:106831. doi: 10.1016/j.jinf.2026.106831. Online ahead of print.
- Kane J, Li X, Kumar S, Button-Simons KA, Brenneman KMV, Dahlhoff H, Sievert MAC, Checkley LA, Shoue DA, Singh PP, Abatiyow BA, Haile MT, Nair S, Reyes A, Tripura R, Peto T, Lek D, Kappe SHI, Dhorda M, Nkhoma SC, Cheeseman IH, Vaughan AM, Anderson TJC, Ferdig MT. A Plasmodium falciparum genetic cross reveals the contributions of pfcrt and plasmepsin II/III to piperaquine drug resistance. bioRxiv [Preprint]. 2023 Sep 17:2023.06.06.543862. doi: 10.1101/2023.06.06.543862.
- Amato R, Lim P, Miotto O, Amaratunga C, Dek D, Pearson RD, Almagro-Garcia J, Neal AT, Sreng S, Suon S, Drury E, Jyothi D, Stalker J, Kwiatkowski DP, Fairhurst RM. Genetic markers associated with dihydroartemisinin-piperaquine failure in Plasmodium falciparum malaria in Cambodia: a genotype-phenotype association study. Lancet Infect Dis. 2017 Feb;17(2):164-173. doi: 10.1016/S1473-3099(16)30409-1. Epub 2016 Nov 3.
- McHenry MS, Mukherjee D, Bhavnani S, Kirolos A, Piper JD, Crespo-Llado MM, Gladstone MJ. The current landscape and future of tablet-based cognitive assessments for children in low-resourced settings. PLOS Digit Health. 2023 Feb 23;2(2):e0000196. doi: 10.1371/journal.pdig.0000196. eCollection 2023 Feb.
- Andrade CM, Fleckenstein H, Thomson-Luque R, Doumbo S, Lima NF, Anderson C, Hibbert J, Hopp CS, Tran TM, Li S, Niangaly M, Cisse H, Doumtabe D, Skinner J, Sturdevant D, Ricklefs S, Virtaneva K, Asghar M, Homann MV, Turner L, Martins J, Allman EL, N'Dri ME, Winkler V, Llinas M, Lavazec C, Martens C, Farnert A, Kayentao K, Ongoiba A, Lavstsen T, Osorio NS, Otto TD, Recker M, Traore B, Crompton PD, Portugal S. Increased circulation time of Plasmodium falciparum underlies persistent asymptomatic infection in the dry season. Nat Med. 2020 Dec;26(12):1929-1940. doi: 10.1038/s41591-020-1084-0. Epub 2020 Oct 26.
- Salgado C, Ayodo G, Macklin MD, Gould MP, Nallandhighal S, Odhiambo EO, Obala A, O'Meara WP, John CC, Tran TM. The prevalence and density of asymptomatic Plasmodium falciparum infections among children and adults in three communities of western Kenya. Malar J. 2021 Sep 17;20(1):371. doi: 10.1186/s12936-021-03905-w.
- Clarke SE, Jukes MC, Njagi JK, Khasakhala L, Cundill B, Otido J, Crudder C, Estambale BB, Brooker S. Effect of intermittent preventive treatment of malaria on health and education in schoolchildren: a cluster-randomised, double-blind, placebo-controlled trial. Lancet. 2008 Jul 12;372(9633):127-138. doi: 10.1016/S0140-6736(08)61034-X.
- Johnson AE, Upadhye A, Knight V, Gaskin EL, Turnbull LB, Ayuku D, Nyalumbe M, Abuonji E, John CC, McHenry MS, Tran TM, Ayodo G. Subclinical Inflammation in Asymptomatic Schoolchildren With Plasmodium falciparum Parasitemia Correlates With Impaired Cognition. J Pediatric Infect Dis Soc. 2024 May 30;13(5):288-296. doi: 10.1093/jpids/piae025.
研究記録日
これらの日付は、ClinicalTrials.gov への研究記録と要約結果の提出の進捗状況を追跡します。研究記録と報告された結果は、国立医学図書館 (NLM) によって審査され、公開 Web サイトに掲載される前に、特定の品質管理基準を満たしていることが確認されます。
主要日程の研究
研究開始 (推定)
研究開始
2028年1月1日
一次修了 (推定)
一次修了
2030年1月1日
研究の完了 (推定)
研究の完了
2033年1月1日
試験登録日
最初に提出
最初に提出
2026年8月27日
QC基準を満たした最初の提出物
QC基準を満たした最初の提出物
2026年8月27日
最初の投稿 (実際)
最初の投稿
2026年9月1日
学習記録の更新
投稿された最後の更新 (実際)
投稿された最後の更新
2026年9月1日
QC基準を満たした最後の更新が送信されました
QC基準を満たした最後の更新が送信されました
2026年8月27日
最終確認日
最終確認日
2026年8月1日
詳しくは
本研究に関する用語
キーワード
追加の関連 MeSH 用語
その他の研究ID番号
その他の研究ID番号
- Optimal Leap
個々の参加者データ (IPD) の計画
個々の参加者データ (IPD) を共有する予定はありますか?
はい
IPD プランの説明
De-identified participant-level data underlying published results, including demographic variables, NeuroScreen EF scores, EGRA/EGMA scores, attendance outcomes, malaria testing results, hemoglobin, inflammatory biomarker data, processed metabolomic pathway data, and processed parasite genotyping/resistance-marker data, as appropriate.
Supporting documents: Study protocol, statistical analysis plan, informed consent form as appropriate, data dictionary, analytic code, and assay metadata.
Timing: Data supporting primary publications will be made available at the time of publication or by the end of the award period, consistent with NIH and repository requirements.
Access criteria: Data will be de-identified before sharing. More granular child-level, school-linked, geospatial, or sensitive data may be shared through controlled-access mechanisms to protect children, families, schools, and communities.
IPD 共有時間枠
Data will become available within 12 months of publication of the primary study results and will remain available for at least 5 years following publication.
IPD 共有アクセス基準
Access to de-identified quantitative data will require submission of a data request, approval by the study investigators, execution of an appropriate data use agreement, and compliance with applicable institutional, U.S., and Kenyan regulations governing human subjects research and data sharing.
医薬品およびデバイス情報、研究文書
米国FDA規制医薬品の研究
いいえ
米国FDA規制機器製品の研究
いいえ
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