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COMPARATIVE STUDY
JOURNAL ARTICLE
Fibrosarcoma versus cellular fibroma of the ovary: a comparative study of their proliferative activity and chromosome aberrations using MIB-1 immunostaining, DNA flow cytometry, and fluorescence in situ hybridization.
American Journal of Surgical Pathology 1997 January
We retrospectively analyzed the proliferative activity and the centromeric copy number of chromosomes 8, 12, and 17 in three cases of fibrosarcoma and eight cases of cellular fibroma of the ovary using MIB-1 immunostaining, DNA flow cytometry, and fluorescence in situ hybridization (FISH) on paraffin-embedded tissue specimens. In our study, both the MIB-1 labeling index (LI) and the proliferative index (% of cells in S + G2 + M phase) in fibrosarcomas were higher than those in cellular fibromas. The FISH analysis demonstrated the sole abnormality of a gain of trisomy 12 cells in all eight cases of cellular fibroma. Both a gain of trisomy 12 cells and a gain of tetrasomy 12 cells were observed in one case of fibrosarcoma. A gain of trisomy 8 cells was observed in all two fibrosarcomas in which signals were detected. By contrast, neither a gain of trisomy 8 cells nor a gain of tetrasomy 12 cells was observed in any of the eight cases of cellular fibroma. Chromosome 17 showed disomy in all eleven cases. On the basis of these findings, a gain of trisomy 8 cells is therefore considered to be an adequately effective marker to distinguish between cellular fibroma and fibrosarcoma of the ovary, and it may also be related to the proliferative activity of fibrosarcoma of the ovary.
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