t(9;22)(q22-31;q11-12) is a consistent marker of extraskeletal myxoid chondrosarcoma: evaluation of three cases

Mod Pathol. 1995 Sep;8(7):765-8.

Abstract

Three cases of extraskeletal myxoid chondrosarcoma with typical histologic and ultrastructural features were investigated cytogenetically. All three cases showed a reciprocal chromosome translocation characterized as t(9;22)(q22-31)(q11-12), thus confirming the findings in three previously karyotyped cases of extraskeletal myxoid chondrosarcoma in the literature. These data add significantly to the evidence of t(9;22) being diagnostic for extraskeletal myxoid chondrosarcoma. Other previously published cases with a range of complex karyotypes were less well defined morphologically. In cases with limited diagnostic material this karyotype might facilitate distinction from myxoid liposarcoma, which consistently shows t(12;16). Clear cell sarcoma, Ewing's sarcoma/primitive neuroectodermal tumor, and desmoplastic round cell tumor also show involvement of chromosome 22 with formation of a hybrid gene between the Ewing's sarcoma gene on band q12 and a transcription factor gene. Whether rearrangement of the Ewing's sarcoma gene is also present in extraskeletal myxoid chondrosarcoma is not clear at present. Cloning of the (9;22) translocation might provide important clues to the pathogenesis of this type of chondrosarcoma.

Publication types

  • Case Reports
  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Cell Nucleus / ultrastructure
  • Chondrosarcoma / genetics*
  • Chondrosarcoma / pathology
  • Chromosome Banding
  • Chromosomes, Human, Pair 22 / genetics*
  • Chromosomes, Human, Pair 9 / genetics*
  • Cytoplasm / ultrastructure
  • Diagnosis, Differential
  • Female
  • Humans
  • Karyotyping
  • Liposarcoma, Myxoid / diagnosis
  • Male
  • Middle Aged
  • Soft Tissue Neoplasms / genetics*
  • Soft Tissue Neoplasms / pathology
  • Translocation, Genetic*