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Gastrointestinal stromal tumors: an ultrastructural study
Rhonda K Yantiss1, Andrew E Rosenberg, Martin K Selig
1James Homer Wright Pathology Laboratories, Massachusetts General Hospital and the Department of Pathology, Harvard Medical School, Boston 02214, USA.
International Journal of Surgical Pathology
|June 21, 2002
Summary
Gastrointestinal stromal tumors (GISTs) exhibit distinct ultrastructural differences based on their location. Gastric and omental GISTs show myogenic differentiation, while small and large intestinal GISTs have unique cell process and filament features.
Area of Science:
- Gastroenterology
- Oncology
- Pathology
Background:
- Gastrointestinal stromal tumors (GISTs) are enigmatic neoplasms with uncertain origins.
- Recent evidence suggests GISTs resemble interstitial cells of Cajal.
- Site-specific evaluation reveals morphologic and biologic behavior variations in GISTs.
Purpose of the Study:
- To investigate site-specific ultrastructural characteristics of GISTs.
- To identify similarities and differences in GIST ultrastructure based on anatomic location.
Main Methods:
- Evaluated 34 GISTs (gastric, small intestinal, colonic, omental) for ultrastructural features.
- Compared epithelioid cell composition, cytoplasmic filaments, intercellular junctions, filopodia, cell processes, basal lamina, pinocytotic vesicles, microtubules, and skenoid fibers.
Main Results:
- Gastric and omental GISTs showed more epithelioid cells, blunt filopodia, and minimal cell process intertwining, suggesting myogenic differentiation.
- Small and large intestinal GISTs displayed long, complex filopodia, microtubules, and skenoid fibers.
- Gastric and omental GISTs were ultrastructurally indistinguishable, suggesting similar origins.
Conclusions:
- GISTs share overlapping ultrastructural features but possess distinctive site-specific characteristics.
- Ultrastructural analysis aids in GIST recognition and classification.
- Omental GISTs may share a similar genesis with gastric stromal tumors.