Malignant Peripheral Nerve Sheath Tumor of the Femur: A Rare Diagnosis Supported by Complete Immunohistochemical Loss of H3K27me3

Masato Sugawara, Eisuke Kobayashi, Naofumi Asano, Akihiko Yoshida, Akira Kawai

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The histological diagnosis of malignant peripheral nerve sheath tumor (MPNST) is challenging because of the wide morphological spectrum and suboptimal performance of conventional immunohistochemical markers. MPNST arising primarily in the bone is exceptional, and its definitive diagnosis, particularly out of the neurofibromatosis type 1 (NF1) context, is even more problematic. Recurrent inactivation of EED or SUZ12 in a majority of MPNSTs results in a complete loss of trimethylated histone H3 at lysine 27 (H3K27me3) immunoreactivity, making it a highly specific biomarker of MPNSTs. In this article, we report a case of sporadic MPNST of the proximal femur that showed complete loss of H3K27me3. The patient was treated with limb-sparing surgery and postoperative radiotherapy. He developed multiple lung and bone metastases 4 months after surgery. Our case confirms the utility of H3K27me3 immunohistochemistry to yield a definitive diagnosis of sporadic MPNST in a rare primary site.

Original languageEnglish
Pages (from-to)629-634
Number of pages6
JournalInternational Journal of Surgical Pathology
Volume25
Issue number7
DOIs
Publication statusPublished - 2017 Oct 1
Externally publishedYes

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Keywords

  • H3K27me3
  • immunohistochemistry
  • malignant peripheral nerve sheath tumor
  • MPNST of bone

ASJC Scopus subject areas

  • Anatomy
  • Surgery
  • Pathology and Forensic Medicine

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