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Flow cytometry used to distinguish between complete and partial hydatidiform moles
R A Fisher1, S D Lawler, M G Ormerod
1Institute of Cancer Research, London, UK.
Placenta
|May 1, 1987
Summary
Flow cytometry accurately determines ploidy in hydatidiform moles. This method distinguishes complete hydatidiform moles (CHMs) and partial hydatidiform moles (PHMs), even when biochemical markers suggest otherwise due to maternal tissue contamination.
Area of Science:
- Reproductive biology
- Genetics
- Gynecologic pathology
Background:
- Hydatidiform moles are abnormal pregnancies with varying ploidy.
- Distinguishing complete hydatidiform moles (CHMs) from partial hydatidiform moles (PHMs) is crucial for diagnosis and management.
- Previous methods may be confounded by factors like maternal tissue contamination.
Purpose of the Study:
- To evaluate the utility of flow cytometry in determining the ploidy of hydatidiform moles.
- To compare flow cytometry results with cytogenetic analysis and biochemical markers.
- To investigate discrepancies observed in previous diagnostic approaches.
Main Methods:
- Cells from fresh and formalin-fixed, paraffin-embedded hydatidiform mole tissues were analyzed.
- Flow cytometry was used to assess cell ploidy.
- Cytogenetic analysis was performed for comparison in nine cases.
Main Results:
- Flow cytometry identified diploid cells in normal conceptions and CHMs.
- Triploid populations were detected in two PHMs.
- Results from flow cytometry correlated well with cytogenetic analysis.
- Two cases diagnosed as CHM were found to be diploid by flow cytometry, despite biochemical markers suggesting trisomy, likely due to maternal tissue contamination.
Conclusions:
- Flow cytometry is a reliable method for assessing ploidy in hydatidiform moles.
- It offers accurate differentiation between CHMs and PHMs.
- The technique can resolve diagnostic ambiguities caused by maternal tissue contamination.