Abstract:
:Malignant fibrous histiocytoma (MFH), the most common soft-tissue sarcoma, consists mainly of two different cell populations: histiocytelike and fibroblastlike cells. It has been suggested to contain a large amount of reactive histiocytes and fibroblasts hard to distinguish from the tumor cells. In this study, the clonality of MFH was determined by analyzing the patterns of X chromosome inactivation at the human androgen receptor gene (HUMARA) using DNA samples from archival snap-frozen and paraffin-embedded tissues. All the eleven informative female heterozygotes without severe inflammation showed the monoclonal pattern; 8 storiform-pleomorphic (6 distinct, 2 relative monoclonal pattern) and 3 myxoid (3 distinct monoclonal pattern) subtype. Although normal tissue DNA, amplifiable by the polymerase chain reaction, valid for the assay was not available in these cases, statistically at least 5 cases are monoclonal (p = 0.037 <0.05), even when markedly skewed lyonization were to primarily exist in the normal tissue at the highest rate as ever reported (33%). Experiments using the mixture of monoclonal and polyclonal DNA at varying ratios have suggested that a distinct monoclonal pattern is obtained only when the monoclonal component exceeds 80%. Our study demonstrates that most cells that are present in MFH are monoclonal in origin which may be the population of tumor cells.
journal_name
Oncologyjournal_title
Oncologyauthors
Fujita MQ,Hashida N,Shin M,Nakanishi H,Yoshihara W,Aozasa Kdoi
10.1159/000011919subject
Has Abstractpub_date
1998-11-01 00:00:00pages
600-6issue
6eissn
0030-2414issn
1423-0232pii
ocl55600journal_volume
55pub_type
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