|Title:||Dedifferentiated liposarcoma with homologous lipoblastic differentiation: Expanding the spectrum to include low-grade tumours||Authors:||JAU-YU LIAU
|Issue Date:||2013||Journal Volume:||62||Journal Issue:||5||Start page/Pages:||702-710||Source:||Histopathology||Abstract:||
Aims: Dedifferentiated liposarcoma (DDLPS) is traditionally defined as a non-lipogenic high-grade sarcoma arising from a well-differentiated liposarcoma that confers metastatic potential. Recently, DDLPSs with lipoblastic differentiation, i.e. morphologically lipogenic DDLPSs, were reported. Because of the lipoblastic differentiation, these tumours caused confusion, and were reported under different names. However, cytogenetic and molecular studies have revealed their DDLPS nature. So far, the cases reported have been high-grade pleomorphic liposarcoma-like tumours. In this study we have collected another series that contains low-grade tumours, and expand the histological spectrum. Methods and results: Eighteen cases of DDLPS with lipoblastic differentiation from various anatomical locations were analysed by routine histology, immunohistochemistry, and MDM2 fluorescence in-situ hybridization. Two main histological patterns were seen: one featured a spindle cell sarcoma containing lipoblasts with variable nuclear pleomorphism, and the other a pleomorphic liposarcoma-like tumour including the epithelioid variant. Two cases showed low nuclear grade and lipogenic activity in the metastatic foci. CDK4, MDM2 and p16INK4a overexpression was seen in all except one case. MDM2 amplification was found in all 16 cases tested. Conclusions: We have expanded the spectrum of this variant of DDLPS to include low-grade tumours, in which a careful search for increased mitotic activity is essential. Like conventional DDLPS, these tumours are capable of metastasis. ? 2012 Blackwell Publishing Ltd.
|ISSN:||0309-0167||DOI:||10.1111/his.12068||SDG/Keyword:||cyclin dependent kinase 4; cyclin dependent kinase inhibitor 2A; protein MDM2; adult; aged; anatomy; article; cancer grading; cancer localization; cellular parameters; clinical article; controlled study; dedifferentiated liposarcoma; differential diagnosis; female; fluorescence in situ hybridization; gene overexpression; histopathology; human; human cell; human tissue; immunohistochemistry; liposarcoma; male; nuclear pleomorphism; priority journal; spindle cell sarcoma; Adipose Tissue; Aged; Cell Transformation, Neoplastic; DNA, Neoplasm; Female; Gene Amplification; Humans; In Situ Hybridization, Fluorescence; Liposarcoma; Male; Middle Aged; Proto-Oncogene Proteins c-mdm2; Soft Tissue Neoplasms
|Appears in Collections:||病理學科所|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.