p53 and Bcl-2 oncoprotein expression in placentas with hydropic changes and partial and complete moles

Area of Science:

• Gynecologic Pathology
• Reproductive Medicine
• Oncology

Background:

• Molar pregnancies, including complete moles and partial moles, require accurate differentiation from non-molar hydropic placentas for appropriate clinical management.
• Immunohistochemical markers may offer objective criteria to improve diagnostic accuracy in challenging cases.

Purpose of the Study:

• To investigate the utility of oncoproteins p53 and Bcl-2 expression in immunohistochemistry for differentiating molar pregnancies (complete mole, partial mole) from hydropic non-molar placentas.
• To assess the potential of p53 and Bcl-2 to distinguish between complete mole and partial mole.

Main Methods:

• Immunohistochemical analysis of p53 and Bcl-2 expression was performed on 40 placentas: 14 complete moles, 14 partial moles, and 12 hydropic non-molar placentas.
• Expression patterns were evaluated in specific trophoblast populations.

Main Results:

• Strong p53 expression was observed in 93% of complete moles and 57% of partial moles, but was absent in extravillous intermediate trophoblasts of non-molar placentas.
• Bcl-2 showed strong, diffuse positivity in syncytiotrophoblasts across most molar and non-molar samples, rendering it less useful for differentiation.
• p53 expression demonstrated significant potential in distinguishing complete moles from hydropic non-molar placentas and, to a lesser extent, partial moles from hydropic non-molar placentas.

Conclusions:

• p53 oncoprotein expression is a valuable immunohistochemical marker for differentiating complete moles and partial moles from hydropic non-molar placentas.
• Bcl-2 expression is not a reliable marker for distinguishing between these placental conditions.