Abstract：
:Partial monosomy 13q, a chromosomal alteration originally reported in spindle cell lipoma, has also been documented in a few cases of mammary myofibroblastoma. Subsequently, a monoallelic loss of RB1 and FOXO1, located on 13q14, was identified in some cases of cellular angiofibroma, a benign stromal tumor of the lower female genital tract. This cytogenetic finding and the overlapping morphologic and immunohistochemical features shared by spindle cell lipoma, mammary myofibroblastoma, and cellular angiofibroma strongly suggest a histogenetic link among these tumors. Recently, we have emphasized morphologic and immunohistochemical similarities between mammary and vulvovaginal myofibroblastoma. The aim of the present study was to asses if these 2 tumors share the same chromosomal alteration. We studied the chromosome 13q14 region by fluorescence in situ hybridization analysis in a series of mammary and vaginal myofibroblastomas, with a readable signal in 7 of 13 mammary myofibroblastomas and 5 of 7 cases of vaginal myofibroblastomas. Despite histologic variation, most of the mammary (5/7) and vaginal (3/5) myofibroblastomas showed monoallelic deletion of FOXO1 in more than 22% of the cell populations. Our findings confirm that mammary myofibroblastoma is a tumor that exhibits chromosome abnormalities associated with the loss of the 13q14 region. In addition, we show for the first time that myofibroblastoma of the lower female genital tract also exhibits the same chromosomal abnormality, supporting the hypothesis that both tumors are in the spectrum of a single entity, likely arising from a common precursor cell.
journal_name
Hum Patholjournal_title
Human pathologyauthors
Magro G,Righi A,Casorzo L,Antonietta T,Salvatorelli L,Kacerovská D,Kazakov D,Michal Mdoi
10.1016/j.humpath.2012.01.015subject
Has Abstractpub_date
2012-11-01 00:00:00pages
1887-93issue
11eissn
0046-8177issn
1532-8392pii
S0046-8177(12)00036-6journal_volume
43pub_type
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