Related Experiment Videos
Usefulness of AgNOR score in differentiating benign from malignant pulmonary aspiration cytology
1Chest Department, Veterans General Hospital-Taipei, Taiwan, Republic of China.
Objective:
Malignant cells are known to display greater argyrophil staining for nucleolar organizer regions (AgNORs) than for benign cells due to their active proliferation. In this study we assessed the diagnostic value of AgNOR staining on 47 fine needle aspiration cytologic specimens of lung previously stained with the May-Grünwald-Giemsa (MGG) method.
Methods:
Cytologic specimens obtained from fine needle aspiration of the lung in 47 proven cases prestained with the MGG technique were destained and restained with the AgNOR method. Seventeen of them were benign and 30 malignant. To differentiate malignant from benign entities, the highest median value for AgNOR number (AgNOR score) obtained from the benign cases was chosen as a cutoff point (test specificity, 100%).
Results:
AgNOR scores of malignant cases were significantly higher than those of benign cases (P < .001). There was no significant difference between two subgroups of benign diseases or among four subgroups of malignant diseases. The sensitivity of the AgNOR score was 93% (28/30) in providing a diagnosis of malignancy when the cutoff value was set at 6.
Conclusion:
The AgNOR technique may be of considerable value in aiding a diagnosis of malignancy, especially when the score is > 6.
Insights
Nucleolar organizer regions (AgNORs) staining effectively differentiates malignant from benign lung cells. This AgNOR score method shows high sensitivity and specificity for diagnosing lung cancer in cytologic specimens.
Area of Science:
- Cytopathology
- Oncology
- Histopathology
Background:
- Malignant cells exhibit increased nucleolar organizer regions (AgNORs) staining due to higher proliferation rates.
- AgNOR staining is a potential biomarker for cellular proliferation and malignancy.
Purpose of the Study:
- To evaluate the diagnostic utility of AgNOR staining in lung fine needle aspiration (FNA) cytologic specimens.
- To assess the efficacy of AgNOR scores in distinguishing benign from malignant lung lesions.
Main Methods:
- 47 lung FNA specimens, previously stained with May-Grünwald-Giemsa (MGG), were destained and restained using the AgNOR method.
- AgNOR scores were analyzed, with a cutoff value determined from benign cases to ensure 100% specificity.
Main Results:
- AgNOR scores were significantly higher in malignant lung specimens compared to benign ones (P < .001).
- The AgNOR score demonstrated a sensitivity of 93% for malignancy diagnosis when the cutoff was set at 6.
- No significant differences were observed within benign or malignant subgroups.
Conclusions:
- The AgNOR staining technique is a valuable adjunct for diagnosing malignancy in lung cytologic specimens.
- An AgNOR score greater than 6 strongly suggests malignancy, aiding in differential diagnosis.