Osteogenic differentiation in dedifferentiated liposarcoma: a study of 36 cases in comparison to the cases without ossification

Kyoko Yamashita, Kenichi Kohashi, Yuichi Yamada, Takeaki Ishii, Yoshihiro Nishida, Hiroshi Urakawa, Ichiro Ito, Mitsuru Takahashi, Takeshi Inoue, Masafumi Ito, Yuuki Ohara, Yoshinao Oda, Shinya Toyokuni

研究成果: Contribution to journalArticle査読

5 被引用数 (Scopus)

抄録

Aims: Ossification is found occasionally in dedifferentiated liposarcoma (DDLPS). The aims of this study were to elucidate whether the formed bone tissue is usually produced by tumour cells or by reactive non-neoplastic cells, and to reveal the clinicopathological characteristics of DDLPS with ossification. Methods and results: We examined 36 cases of ossified DDLPS by comparing them to 31 cases of non-ossified DDLPS. MDM2 amplification was confirmed in osteocytes and/or osteoblastic cells in all but one ossified DDLPS cases (27 of 28) using fluorescence in-situ hybridisation, although the morphological impression of ossification appeared to be mainly metaplastic (27 of 36) or high-grade osteosarcoma-like (six of 36). The bone tissue was often formed predominantly at the periphery of the DDLPS area near the well-differentiated liposarcoma component (18 of 36), and an organised structure such as bone marrow-like differentiation was not uncommon (12 of 36). According to a modified French Fédération Nationale des Centers de Lutte Contre le Cancer (FNCLCC) grading system, ossified DDLPS tended to be lower grade than non-ossified DDLPS (mean grade: 1.88 and 2.15, respectively). Ossification in DDLPS was associated significantly with shorter local recurrence-free survival by multivariate analysis (P = 0.02347), but metaplastic-appearing ossification tended to be associated with longer overall survival (P = 0.1400). Conclusions: The bone tissue formed in DDLPS was mainly neoplastic regardless of its morphology and maturity, which highlighted the osteogenic differentiation of the tumour cells. DDLPS patients with osteogenic differentiation tended to suffer from earlier local recurrences, which did not necessarily lead to poor life outcomes.

本文言語英語
ページ(範囲)729-738
ページ数10
ジャーナルHistopathology
72
5
DOI
出版ステータス出版済み - 4 2018

All Science Journal Classification (ASJC) codes

  • 病理学および法医学
  • 組織学

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