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Peripheral primitive neuroectodermal tumors in adults: documentation by molecular analysis

E R Lawlor1, J A Mathers, T Bainbridge

  • 1Department of Pathology, British Columbia's Children's Hospital, Vancouver, Canada.

Journal of Clinical Oncology : Official Journal of the American Society of Clinical Oncology
|March 21, 1998
PubMed
Summary
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Peripheral primitive neuroectodermal tumors (pPNETs), typically seen in children, can occur in adults over 40. Identifying EWS/ETS gene fusions confirms this diagnosis in older patients with bone and soft tissue small round-cell tumors (SRCTs).

Area of Science:

  • Oncology
  • Molecular Diagnostics
  • Genetics

Background:

  • Peripheral primitive neuroectodermal tumors (pPNETs) and Ewing tumors (ET) are rare small round-cell tumors (SRCTs) primarily affecting children and adolescents.
  • While these tumors are uncommon in adults, their diagnosis can be challenging due to overlapping features with other SRCTs.

Observation:

  • This study investigated the presence of EWS/ETS gene fusions in adult patients diagnosed with suspected pPNETs.
  • Molecular analysis identified EWS/ETS gene fusions in nine patients aged 40–65 years with bone and soft tissue SRCTs.

Findings:

  • Histopathologic and clinical features of these adult pPNETs were similar to those observed in pediatric cases.
  • The presence of EWS/ETS gene fusions served as a definitive diagnostic marker for pPNET in older adults.

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Implications:

  • The detection of EWS/ETS gene fusions provides objective evidence for diagnosing pPNET in patients over 40.
  • This highlights the importance of considering pPNET in adult SRCT cases and performing molecular analysis on biopsy specimens.