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Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
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Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...
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Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
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Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
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ERG expression in chondrogenic bone and soft tissue tumours.

Wonwoo Shon1, Andrew L Folpe2, Karen J Fritchie2

  • 1Department of Pathology, Immunology, and Laboratory Medicine, University of Florida College of Medicine, Gainesville, Florida, USA.

Journal of Clinical Pathology
|November 8, 2014
PubMed
Summary

This study investigated ERG expression in chondrogenic tumors, finding consistent nuclear ERG staining in soft tissue chondromas, chondromyxoid fibromas, chondroblastic osteosarcomas, and clear cell chondrosarcomas, supporting ERG as a marker for cartilaginous differentiation.

Keywords:
BONE TUMOUR PATHOLOGYIMMUNOHISTOCHEMISTRYSOFT TISSUE TUMOURS

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Area of Science:

  • Oncology
  • Pathology
  • Molecular Biology

Background:

  • Chondroid and cartilaginous differentiation in bone and soft tissue tumors is complex.
  • Identifying reliable markers for specific tumor subtypes is crucial for accurate diagnosis and treatment.

Purpose of the Study:

  • To evaluate the expression of ERG (E-twenty-six related gene) in a diverse range of chondrogenic bone and soft tissue tumors.
  • To determine the utility of ERG as a potential immunohistochemical marker for chondroid/cartilaginous differentiation.

Main Methods:

  • Immunohistochemistry was performed on 111 formalin-fixed, paraffin-embedded bone and soft tissue tumor sections.
  • Anti-ERG monoclonal antibody was used to detect nuclear ERG expression.
  • Staining intensity was quantitatively scored.

Main Results:

  • Consistent nuclear ERG expression was observed in soft tissue chondroma, chondromyxoid fibroma, chondroblastic osteosarcoma, and clear cell chondrosarcoma.
  • Conventional chondrosarcomas showed positive ERG staining in most cases (10/12).
  • ERG expression was variable in extraskeletal myxoid chondrosarcomas and chondroblastomas, and largely negative in enchondromas and dedifferentiated/primitive components of other tumors.

Conclusions:

  • Nuclear ERG expression is a relatively constant feature in specific chondrogenic tumors, including conventional chondrosarcoma, chondromyxoid fibroma, chondroblastic osteosarcoma, and clear cell chondrosarcoma.
  • ERG can serve as a valuable ancillary diagnostic tool in select cases of cartilaginous tumors.
  • Awareness of ERG expression patterns is important for accurate interpretation in the context of tumor diagnosis.