Removal of Anti-Angiogenic Proteins in Preeclampsia Before Delivery

Study Overview
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Brief Summary
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Preeclampsia is a syndrome that occurs in approximately 3% to 8% of pregnancies and is associated with considerable maternal and neonatal morbidity and mortality. Except for termination of the pregnancy, effective treatments/preventative measures for preeclampsia are lacking. Although prolongation of pregnancy benefits the fetus, it is detrimental to the mother, and is associated with hypertension, proteinuria, and symptoms that suggest kidney, brain, liver and cardiovascular system involvement. Placental soluble fms-like tyrosine kinase 1 (sFlt-1) is elevated in women with preeclampsia, with levels that fall after delivery. sFlt-1 is a variant of the vascular endothelial growth factor (VEGF) receptor Flt-1, and in the circulation, acts as a potent VEGF and placental growth factor (PlGF) antagonist. Given that sFlt-1 levels are elevated in preeclampsia, we are investigating if removal of sFlt-1 from the plasma of women with preeclampsia can improve maternal and fetal outcomes. Short-term extracorporeal apheresis with the LIPOSORBER LA-15 System will be the primary intervention using methods that have been previously applied in pregnant women with familial hypercholesterolemia.

Detailed Description
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The primary objective of this trial is to determine whether short-term apheresis using a dextran sulfate adsorption (DSA) column (Liposorber LA-15 System; the Device) leads to a reduction in circulating sFLT-1 in the blood of women with pre-term preeclampsia. The following secondary objectives are aimed at evaluating the efficacy and safety of the Device as well as the impact of removing circulating sFlt-1 on maternal and neonatal outcomes: To determine whether short-term apheresis using the Device in women with pre-term preeclampsia leads to: a prolongation of pregnancy (ie, gestational age) a reduction in blood pressure (BP) and proteinuria an increase in fetal birth weight To determine the safety of reducing maternal sFlt-1 levels using the Device. Up to 16 patients will be enrolled. Initially, 4 patients will undergo apheresis UP TO 2 times in the first week and undergo all protocol-related assessments including PK of sFlt-1 levels. Based on an assessment of clinical response by the Investigator, these first 4 patients will be offered the option to continue apheresis treatments (without pharmacokinetic [PK] assessments) up to twice weekly until delivery or until 34 weeks gestation, whichever comes first. Following complete review of all parameters and outcomes by an independent Data Safety Monitoring Board (DSMB), up to 12 additional patients will be enrolled (total of up to 16). UPDATE: The DSMB reviewed data after the first 4 patients and again after 10 patients/delivered infants had been treated. In the next 6 patients, DSMB review will occur after every 3 patients/delivered infants. These remaining 6 patients may undergo apheresis up to 3 times per week.

Official Title
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Phase 1b Proof-of-Concept Study of Apheresis to Reduce Soluble Fms-like Tyrosine Kinase-1 (sFlt-1) in Pregnant Women With Preeclampsia Using a Dextran Sulfate Adsorption (DSA) Column (LIPOSORBER® LA-15 System)

Conditions
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Preeclampsia

Intervention / Treatment
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* Device: Apheresis using Liposorber LA-15 System


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria (maternal): Signed informed consent in a pregnant woman ages 18 and 45 years hospitalized for pre-term preeclampsia Pre-term preeclampsia defined by systolic BP ≥140 mm Hg or ≥90 mm Hg diastolic at or after 23 weeks of gestation or at or before 32 weeks in gestation in a woman with previously normal BP and proteinuria 0.3 grams in a 24-hour specimen or urine protein/creatinine ratio >0.30. sFlt-1/PlGF ratio >85 (blood levels of sFlt-1 and PlGF determined using CE-approved Roche Diagnostics assays). Exclusion Criteria (Maternal and Fetal): Maternal: Taking any form of angiotensin cascade blocker History or diagnosis of pre-existing chronic hypertension (first 3 patients only) History of cardiac impairments including uncontrolled arrhythmia, unstable angina, decompensated congestive heart failure or valvular disease History or diagnosis of chronic renal disease Patients receiving anticoagulation therapy prior to study entry Anticipated immediate delivery within 24 hours Signs of central nervous system (CNS) dysfunction, including seizures, cerebral edema (CT-scan or MRI) History of thyroid disease History of liver abnormalities Pulmonary edema Thrombocytopenia (platelet count < 100,000/mm3) Anemia - hemoglobin < 8 g/dL Evidence of reverse Doppler flow on umbilical Doppler Placenta previa Placental abruption Pre-term labor Active hepatitis B, C, or tuberculosis infection or HIV positive status Any condition that the investigator deems a risk to the patient or fetus in completing the study. Any condition which in the opinion of the investigator would necessitate delivery in the next 24 hours Fetal characteristic that would exclude the mother from participating: Trisomy Biophysical profile (BPP) < 6 Amniotic fluid index (AFI) < 5 cm Estimated fetal weight (EFW) < 5th percentile for gestational age (IUGR)

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 45 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Apheresis<br>Apheresis using Liposorber LA-15 System | Device: Apheresis using Liposorber LA-15 System<br>* The Liposorber LA-15 Device is a dextran sulfate cellulose column, one of several currently approved in Europe and United States for pheresis of lipoproteins in the treatment of familial hypercholesterolemia. Such devices have been in use for over 30 years. Published experience in pregnant women with familial hypercholesterolemia suggests that lipoprotein pheresis can be safely used in pregnancy after appropriate individual benefit/risk assessment for both mother and fetus is considered. The Liposorber LA-15 system selected for this trial has been evaluated for its ability to efficiently and selectively remove sFlt-1 in vitro.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| sFlt-1 levels measured immediately prior to each apheresis treatment, and at 2-4, 12, 24, etc. (every 24 hours) following termination of apheresis to determine kinetics of sFlt-1 clearance (until delivery). | The study period for each patient will be from initiation of the device until 30 days (± 7 days) after delivery. Additional assessments will be performed at 90 and 365 days (± 7 days, respectively) using maternal and neonatal medical records and/or by telephone contact with the mother. | 12 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Maternal and fetal safety | Maternal: Blood pressure, proteinuria, coagulation parameters, elevated liver enzymes, and low platelet count (HELLP) syndrome, maternal complications Fetal: Early fetal assessments delivery (birth) will include gestational age, birth weight, length, fetal APGAR scores (1'/5'/10'), amniotic fluid volume by ultrasonography, and head circumference, NICU details, pulmonary parameters and any neonatal complications (eg, ventilatory support, respiratory distress syndrome, CRIB-Score, cerebral hemorrhage, ischemic colitis, and retinopathy of prematurity [ROP]) and compared to historical milestones. Fetal cord blood (with maternal consent) is to be sampled from umbilical artery at delivery to determine sFlt-1 levels, to measure pH and stored for later biochemical analyses. Fetal assessments will also occur  30, 60, 90 and 365 days after delivery. | 12 months | 
| Maternal and fetal efficacy | Maternal: Prolongation of pregnancy, reduction in blood pressure and proteinuria Fetal: Outcomes will be collected on all births, at birth, 24-hours post-partum, 72-hours post-partum, 30 day status vs historical milestones. 90 and 365 day assessments will be made using data obtained from medical records. | 12 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Pregnancy, Preeclampsia, Pre-term, sFlt-1, Apheresis, Hypertension, Proteinuria, VEGF