E-cadherin/CD34 double immunostaining in placental diagnosis

Area of Science:

• Pathology
• Perinatal Medicine
• Immunohistochemistry

Background:

• Placental foetal vascular malperfusion (FVM) is linked to adverse fetal and neonatal outcomes.
• Standard histological stains like H&E may not reveal subtle signs of recent FVM.

Purpose of the Study:

• To evaluate the utility of a double E-cadherin/CD34 immunostain in diagnosing FVM and other placental pathologies.
• To assess the stain's ability to identify recent FVM, temporal heterogeneity, and differentiate specific placental lesions.

Main Methods:

• Routine application of a double E-cadherin/CD34 immunostain on placental sections, particularly from complicated pregnancies.
• Analysis of endothelial fragmentation, basement membrane changes, and differentiation of mineralized thrombi versus pseudo-inclusions.

Main Results:

• The double immunostain highlights distal villous endothelial fragmentation indicative of recent FVM, often missed by H&E.
• It reveals temporal heterogeneity of FVM, aiding in determining causes of fetal death or poor neonatal condition.
• The stain assists in diagnosing distal villous hypomaturity, differentiates mineralized stem occluding thrombi from pseudo-inclusions, and aids in identifying trophoblastic lesions in shallow placental implantation.

Conclusions:

• The double E-cadherin/CD34 immunostain is a valuable tool for the histological diagnosis of placental lesions and patterns of injury.
• It enhances the detection and characterization of FVM, contributing to improved understanding of fetal and neonatal complications.
• This technique offers diagnostic advantages in differentiating FVM from placental aneuploidies and assessing trophoblastic lesions.