Distinctive flow histogram pattern in molar pregnancies with elevated maternal serum human chorionic gonadotropin...

Area of Science:

• Reproductive Biology
• Gynecologic Pathology
• Flow Cytometry

Background:

• Flow cytometry of trophoblastic tissue differentiates partial hydatidiform moles (PMs) (triploid) from complete moles (CMs) (diploid/tetraploid).
• Ploidy analysis aids CM/PM diagnosis, but indeterminate cases exist.
• Distinguishing moles from non-molar conditions like hydropic abortion is crucial.

Purpose of the Study:

• To identify specific DNA flow histogram patterns in hydatidiform moles.
• To improve diagnostic accuracy and eliminate indeterminate diagnoses.
• To correlate histogram patterns with clinical and biochemical markers.

Main Methods:

• DNA flow histograms analyzed in 86 cases (40 hydropic abortions, 17 CMs, 29 PMs).
• Histological diagnosis, microscopic appearance, and maternal serum human chorionic gonadotropin (HCG) levels were correlated.
• Focus on nondiploid moles with high HCG (>150,000 mIU/ml).

Main Results:

• A sloping histogram pattern observed in 12/14 nondiploid moles with high HCG.
• This pattern lacked a distinct aneuploid peak, appearing as a slope towards the tetraploid region.
• S-phase fraction showed a trend towards higher values in moles, but not statistically significant.

Conclusions:

• The sloping histogram pattern may indicate progression from single to multiple aneuploid cell populations.
• Statistically significant correlation (P < 0.001) between the sloping pattern and high HCG suggests metabolically active aneuploid trophoblast.
• This pattern aids in distinguishing hydatidiform moles from hydropic spontaneous abortions.