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Gastrointestinal stromal tumors.

E S Casper1

  • 1Chief, Medical Oncology, Memorial Sloan Kettering at Saint Clare's, 23 Pocono Road, Denville, NJ 07834, USA.

Current Treatment Options in Oncology
|June 12, 2002
PubMed
Summary

Nonepithelial, non-lymphoid gastrointestinal tumors are diverse. Gastrointestinal stromal tumors (GIST) are now specifically defined by molecular markers, with surgery as the primary treatment for localized disease.

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Area of Science:

  • Gastroenterology
  • Surgical Oncology
  • Oncology

Background:

  • Nonepithelial, non-lymphoid tumors of the gastrointestinal tract exhibit significant heterogeneity.
  • Nomenclature and understanding of these tumors have evolved, necessitating revised classifications.
  • Many previously misclassified tumors are now recognized as gastrointestinal stromal tumors (GIST).

Purpose of the Study:

  • To clarify the evolving concepts and nomenclature of nonepithelial, non-lymphoid gastrointestinal tumors.
  • To define the diagnostic criteria for gastrointestinal stromal tumors (GIST).
  • To review current therapeutic strategies and outcomes for these diverse neoplasms.

Main Methods:

  • Review of current literature and evolving diagnostic criteria for gastrointestinal nonepithelial, non-lymphoid tumors.
  • Pathological and molecular definition of GIST, including key markers (vimentin, CD34, CD117).
  • Analysis of therapeutic approaches including surgical resection, chemotherapy, and interventional radiology techniques.

Main Results:

  • GIST is defined by lack of myogenic differentiation and expression of specific markers (CD34, CD117).
  • Complete surgical resection is the primary curative treatment for localized GIST.
  • Metastasis commonly occurs in the liver and peritoneum; prognosis is poor with incomplete resection or metastatic disease.
  • Systemic chemotherapy and some interventional radiology techniques show limited efficacy, requiring further study.

Conclusions:

  • GIST represents a distinct entity within nonepithelial, non-lymphoid gastrointestinal tumors.
  • Surgical management remains critical, with evolving roles for palliative and adjuvant therapies.
  • Further research is needed to establish optimal treatment protocols for unresectable or metastatic GIST.

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