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Decrease of TET2 expression and increase of 5-hmC levels in myeloid sarcomas.

Desheng Xiao1, Ying Shi2, Chunyan Fu1

  • 1Department of Pathology, Xiangya Hospital, Central South University, Changsha, Hunan 410078, China; Department of Pathology, School of basic medicine, Central South University, Changsha, Hunan 410078, China.

Leukemia Research
|January 27, 2016
PubMed
Summary

Immunohistochemistry aids myeloid sarcoma diagnosis. Key markers like MPO, CD68, and CD34 help identify subtypes, while TET2 and 5-hmC changes offer novel diagnostic insights.

Keywords:
5-hmCCD34CD68Myeloid sarcomaMyeloperoxidaseTET2

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Area of Science:

  • Hematopathology
  • Oncology
  • Molecular Diagnostics

Background:

  • Myeloid sarcoma presents as extramedullary tumor masses of immature myeloid cells.
  • Diagnosis is challenging due to subtle morphological features and lack of systemic disease indicators.
  • Subtyping myeloid sarcoma based on histology alone is often difficult.

Purpose of the Study:

  • To evaluate the utility of immunohistochemical markers for diagnosing and subtyping myeloid sarcoma.
  • To identify key protein markers for differentiating myeloid sarcoma subtypes.
  • To explore novel epigenetic markers for myeloid sarcoma detection.

Main Methods:

  • Immunohistochemical analysis of 18 paraffin-embedded myeloid sarcoma samples.
  • Assessment of marker expression including CD34, CD68, Myeloperoxidase (MPO), CD117, TET2, and 5-hmC.
  • Correlation of marker expression with myeloid sarcoma subtypes (blastic, differentiated, immature).

Main Results:

  • CD34 was positive in 67% of cases, particularly in immature types.
  • CD68 was found in 83%, predominantly in differentiated types.
  • MPO was positive in all cases, with lower reactivity in blastic subtypes.
  • TET2 protein showed negative reactivity in 88%, while nuclear 5-hmC was positive in 100%.

Conclusions:

  • An immunohistochemical panel (MPO, CD68, CD34) is effective for detecting blastic, differentiated, and immature myeloid sarcoma.
  • Loss of TET2 and gain of 5-hmC represent potential novel markers for myeloid malignancies, including myeloid sarcoma.