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Flow cytometric analysis of malignant pleural mesotheliomas
G C Burmer1, P S Rabinovitch, B G Kulander
1Department of Pathology, University of Washington School of Medicine, Seattle 98195.
Abstract:
Forty-six cases of malignant pleural mesothelioma were analyzed for histologic subtype, DNA content, and cell cycle characteristics. Sixty-five percent of cases were diploid in DNA content, with intermediate to low proliferative rates. Thirty-one nonmesothelial malignant neoplasms of the lung, of histologic types most easily confused with malignant mesothelioma, were also examined. In contrast to the mesotheliomas, 85% of these nonmesothelial malignant neoplasms of the lung were aneuploid; the aneuploid neoplasms exhibited higher mean proliferative rates (S = 10.6%) than diploid nonmesothelial neoplasms of the lung (S less than 6%). Unlike most malignant neoplasms, mesotheliomas most often display diploid DNA contents and low proliferative rates despite their clinically aggressive behavior.
Insights
Malignant pleural mesothelioma, unlike other lung cancers, typically shows diploid DNA content and low proliferation rates. This study differentiates mesothelioma from other lung neoplasms based on these cell cycle characteristics.
Area of Science:
- Oncology
- Pathology
- Cell Biology
Background:
- Malignant pleural mesothelioma is an aggressive cancer.
- Distinguishing mesothelioma from other lung cancers is crucial for accurate diagnosis and treatment.
- Cell cycle characteristics like DNA content and proliferation rates can aid in differential diagnosis.
Purpose of the Study:
- To analyze the DNA content and cell cycle characteristics of malignant pleural mesothelioma.
- To compare these characteristics with nonmesothelial lung neoplasms that mimic mesothelioma histologically.
- To identify potential diagnostic markers for mesothelioma based on cell cycle analysis.
Main Methods:
- Histologic subtyping of 46 malignant pleural mesothelioma cases.
- Flow cytometry analysis of DNA content for mesothelioma and 31 nonmesothelial lung neoplasms.
- Assessment of cell cycle proliferative rates (S phase fraction) in both groups.
Main Results:
- 65% of malignant pleural mesotheliomas were diploid with low to intermediate proliferative rates.
- 85% of nonmesothelial lung neoplasms were aneuploid.
- Aneuploid nonmesothelial neoplasms showed significantly higher proliferation rates (S=10.6%) than diploid ones (S<6%).
Conclusions:
- Malignant pleural mesothelioma typically exhibits diploid DNA content and low proliferative rates, contrasting with most malignant neoplasms.
- These cell cycle characteristics can help differentiate mesothelioma from histologically similar nonmesothelial lung cancers.
- Despite aggressive clinical behavior, mesothelioma's cell cycle profile is distinct from other aggressive lung malignancies.