Elsevier

Human Pathology

Volume 31, Issue 3, March 2000, Pages 306-311
Human Pathology

Original Contribution
Recurrent anomalies of 6q25 in chondromyxoid fibroma*

https://doi.org/10.1016/S0046-8177(00)80243-9Get rights and content

Chondromyxoid fibroma is a rare benign bone tumor most commonly arising in the metaphysis of long bones in young adults. Histopathologically, chondromyxoid fibroma may be difficult to distinguish from other cartilaginous neoplasms. Recently, a pericentric inversion of chromosome 6 [inv(6) (p25q13)] has been proposed as a specific genetic marker for chondromyxoid fibroma. In this study, cytogenetic and spectral karyotypic analyses of 2 chondromyxoid fibroma cases showed clonal abnormalities of chromosome 6 but at a breakpoint on the long arm (q25) distal to that described in the pericentric inversion. These findings suggest that several distinct breakpoints on chromosome 6 are nonrandomly involved in chondromyxoid fibroma.

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      There is a small risk of local recurrence; however, malignant transformation is not expected. Recurrent abnormalities of chromosome 6 have been reported in this tumor.1,5,18,25,27,28 This is not a true neoplasm but rather a congenital malformation.

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      Breakpoints at p25q23 and p25q15 were reported in one case each (8,18). A reciprocal translocation, t(6;9)(q25;q22), has been identified in three cases of CMF (11,18) (Table 1). Ozaki reported that chromosome loss is more frequent than gain in benign cartilaginous tumors, with an average of 5.3 aberrations per tumor and a 1:7 gain-to-loss ratio (14).

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    *

    Supported in part by grants from the Nebraska State Department of Health, LB595, and the John A. Wiebe Children's Health Care Fund.

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