Clinical trial NCT02668120: Search Elevated Serum Alkaline Phosphatase as a Marker of Prenatal Intervillositis Chronic Histiocytic
Official title: Search Elevated Serum Alkaline Phosphatase as a Marker of Prenatal Intervillositis Chronic Histiocytic (IHC)
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Chronic Histiocytosis
Keywords: chronic histiocytic intervillositis
serum alkaline phosphatase
placenta
case-control study
Lead sponsor: University Hospital, Lille
Sponsor class: OTHER
First posted: 2016-01-29
Enrollment: 54
Sex: FEMALE
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: CASE_CONTROL
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Patient pregnant following at the Lille University Hospital. The case group will be composed of patients who experienced chronic histiocytic intervillositis. Two control groups will be prospectively: The first will include patients whose pregnancy is low risk. The second will consist of pathological pregnancies (IUGR, Preeclampsia and Death In Utero).

Brief summary: Background : Chronic histiocytic intervillositis is a rare placental disease linked with poor perinatal outcome. In a recent study, a major antenatal increased alkaline phosphatase was suspected in patients affected by chronic histiocytic intervillositis. This increase may correspond to the release of alkaline phosphatase by the syncytiotrophoblaste prejudiced in this pathology.

Aim : To confirm the association between high levels of alkaline phosphatase and the occurrence of chronic histiocytic intervillositis.

Detailed description: Single-center study of case-control comparing three groups of patients matched for gestational age at the time of sampling. The case group will be composed of patients who experienced chronic histiocytic intervillositis which an alkaline phosphatase assay is available during pregnancy (retrospective recruitment). Two control groups will be prospectively: The first will include patients whose pregnancy is low risk. The second will consist of pathological pregnancies (IUGR, Preeclampsia and Death In Utero). All patients will have a blood sample with determination of serum alkaline phosphatase activity and examination of the placenta at delivery.

Eligibility criteria: Inclusion Criteria:

* Patient aged 18 years or more
* Having signed a free and informed consent
* Enjoying a social security scheme

Inclusion criteria for cases:

* Patient who gave birth at the Lille University Hospital between 2000 and 2009.
* Lesion of intervillositis chronic histiocytic (IHC) diagnosed during histological examination of the placenta.
* An alkaline phosphatase assay during pregnancy is available and has been achieved at University Hospital of Lille.
* Prior information and not opposition of the patient to the secondary use of data collected in medical file.

Inclusion criteria for low-risk pregnancy :

* No pathological obstetric history, no current pregnancy complications
* Followed antenatal clinics at the Lille University Hospital
* A gestational age corresponding to one of the cases (pairing ± 1 week)
* No chronic intervillositis after pathological examination of the placenta

Inclusion criteria for high-risk pregnancy:

* Patient hospitalized in the maternal-fetal pathology of the Lille University Hospital Service
* Presence of IUGR, Death in Utero or severe preeclampsia with fetal repercussion
* A gestational age corresponding to one of the cases (pairing ± 1 week)
* No chronic intervillositis after pathological examination of the placenta

Exclusion Criteria:

* Twin pregnancy
* Liver disease in the interrogation
* Lack of consent of the patient
* Patient not covered by a social security scheme
* Patient minor
* Patient under guardianship

Primary outcomes:
measure: Number of subjects with alkaline phosphatase levels greater than or equal to 5 times the normal
timeFrame: At the time of inclusion
Secondary outcomes:
Other outcomes:
Locations:
city: Lille
country: France
facility: CHRU,Hôpital Jeanne de Flandres
Study officials:
affiliation: University Hospital, Lille
name: Damien Subtil, MD, PhD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Marchaudon V, Devisme L, Petit S, Ansart-Franquet H, Vaast P, Subtil D. Chronic histiocytic intervillositis of unknown etiology: clinical features in a consecutive series of 69 cases. Placenta. 2011 Feb;32(2):140-5. doi: 10.1016/j.placenta.2010.11.021. Epub 2010 Dec 22.