Healthy Lactating Women Clinical Trial
Official title:
Breastfed Child Exposure to Tafenoquine and Primaquine During Treatment in Lactating Women: a Pharmacokinetic Study in Healthy Volunteers
Each year almost a million infants are born small for gestational age due to malaria infection in pregnancy. These infants are at risk for stillbirth or neonatal death, and being born too small predisposes the survivors to increased metabolic diseases later in life. Plasmodium vivax (PV) is the second most common malaria species globally. Its relapsing nature results in multiple episodes of PV in a single pregnancy, compounding growth restriction and stillbirth risk. Women with PV in one pregnancy may harbor dormant parasites (hypnozoites) in their liver the cause illness and poor fetal growth in a subsequent pregnancy. Only radical cure with 8-aminoquinolines (8AQ)- primaquine (PMQ) or tafenoquine (TQ) - can eliminate hypnozoites, but these drugs are contraindicated in pregnancy. The postpartum period presents a key window of opportunity for giving radical cure to women of childbearing age with PV. Pharmacokinetic data is needed to support safe use of these drugs postpartum and World Health Organization has identified pharmacokinetic studies of 8AQ in lactation as a research priority. Primaquine is excreted minimally in mature breast milk, at <1% of the weight-adjusted relative infant dose (RID). As the main adverse event associated with both 8AQ - hemolysis glucose-6-phosphate dehydrogenase (G6PD) deficient individuals - is dose-dependent and negligible at low doses, this finding strongly supports its safe use in later lactation. This study is needed to determine if primaquine can also be given safely in the early postpartum period. There is no published data on tafenoquine excretion in breastmilk, and this study would quantify safety throughout early and late lactation. Drug safety studies in lactation are essential to ensure medications are not denied and unnecessary interruption of breastfeeding is avoided. Demonstration of safety of radical cure for breastfeeding women in the postpartum period would allow women with PV in pregnancy and lactation to receive 8AQ after delivery, preventing illnesses in the postpartum period and subsequent pregnancies. Improved uptake of radical cure through elimination of unnecessary contraindications supports malaria elimination and community health. The main purpose of this study is to characterize the transfer of tafenoquine and primaquine in breast milk of mothers receiving radical cure doses of 8AQ throughout the different phases of lactation - colostrum, transitional milk, and mature milk - in order to determine the degree of infant exposure.
The study will take place at clinics of the Shoklo Malaria Research Unit (SMRU), Mahidol-Oxford Tropical Medicine Research Unit in Tak Province, Thailand. The clinics serve a population of migrant workers resident along the Thailand-Myanmar border. Non-pregnant breastfeeding women that access care at SMRU (postnatal care, outpatient, vaccine and routine baby care departments) will be invited to participate with their breastfed children. All lactating women and their children will be G6PD phenotypically normal. Participants will be enrolled as follows; Arm 1: Primaquine mother-neonate pairs Arm 2: Tafenoquine mother-child pairs Arm 3: Tafenoquine mother-neonate pairs Pharmacokinetic sampling plan: - PMQ pharmacokinetic sampling (Mother/Neonate pairs - Arm 1): - Mothers: Dense pharmacokinetic venous blood and breast milk sampling will be performed during day 1 and 14; one sample of blood and breast milk will collected at a single timepoint on days 3, 5 and 8. - Neonate: One capillary blood sample will be collected on the same days as maternal sampling. - TQ pharmacokinetic sampling (Mother/child pairs - Arms 2, and 3): - Mothers: Dense pharmacokinetic venous blood and breast milk sampling will be performed during the first day after dosing, followed by one sample of blood and breast milk at a single time point on days 2, 3, 8, 15, 29, 43 and 75 (allowing a description of approximately 95% of the total drug exposure). - Child: One capillary blood sample will be collected on the same days as maternal sampling. Mothers and children will be closely monitored for safety throughout the 75 day follow up period including regular assessments of adverse events, Hb, Hct and MetHb levels. Pharmacokinetic drug measurements of primaquine, carboxyprimaquine and tafenoquine will be performed at the Department of Clinical Pharmacology, Mahidol-Oxford Tropical Medicine Research Unit (MORU), Bangkok, Thailand. Drug concentrations will be quantified by liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS). Interim data review will be done by an external drug safety monitoring board (DSMB) before recruitment of Arm 3. The board will review safety data and any available PK data. If PK data is not yet available and there are safety concerns, recruitment in Arm 3 may be suspended until PK data from Arms 1 and 2 are available. Study participants with any adverse events will be followed until the event has stabilized or resolved (unless the participant refuses such follow up care). Free care will be offered through SMRU clinics. For severe harm caused by study procedures following this protocol, Oxford University insurance will support additional health care beyond SMRU's capacity. This study is funded by Thrasher Research Fund. ;
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