Micronucleus and Its Significance in Effusion Fluids

Area of Science:

• Cytopathology
• Oncology
• Cell Biology

Background:

• Micronuclei (MN) are cellular indicators formed from chromosome fragments or whole chromosomes lagging during cell division.
• Micronucleus scoring in effusions is a potential diagnostic tool for identifying malignancy.

Purpose of the Study:

• To evaluate the utility of micronucleus scoring in differentiating malignant effusions from benign effusions.
• To establish a correlation between micronucleus score and the type of malignant effusion.

Main Methods:

• A retrospective analysis of 30 malignant and 30 benign effusion samples.
• Papanicolaou-stained effusion smears were analyzed under oil immersion (1,000× magnification).
• Micronucleated cells were quantified per 1,000 cells.

Main Results:

• Malignant effusions exhibited a significantly higher mean MN score (3.77 ± 2.13) compared to benign effusions (0.50 ± 0.57; P < 0.001).
• A cut-off MN score of 6.5 demonstrated 100% sensitivity and 100% specificity in distinguishing malignant from benign effusions.
• The study identified a statistically significant difference in MN scores between malignant and benign effusions.

Conclusions:

• Micronucleus score is a valuable biomarker for differentiating malignant effusions from benign effusions.
• This method is particularly useful in low-resource settings for cytological diagnosis.
• Elevated MN scores are indicative of malignancy in effusion samples.