[Gastrointestinal stromal tumors: clinical, pathologic features and effectiveness of new diagnostic criteria].
ABSTRACT The effective and reproducible diagnostic parameters for differentiating benign from malignant gastrointestinal stromal tumors (GISTs) are still not clear. In this study, GISTs were diagnosed and classified by immunohistochemistry and their clinical and pathologic features were investigated. GISTs were re-evaluated by Amin's and NIH's criteria, and prognostic relevance of these two criteria were compared.
Fifty cases of gastrointestinal mesenchymal tumor diagnosed from May 1990 to February 2000, were evaluated by immunohistochemical staining for CD117, CD34, smooth muscle actin, and S-100 protein. GISTs were diagnosed according to Amin's and NIH's criteria. The relationship between the prognosis and diagnosis based on Amin's or NIH's classification were analyzed.
Thirty cases of gastrointestinal mesenchymal tumors were diagnosed as GISTs. The stomach (40%) and small bowel (40%) were the most common origin for GISTs. Immunophenotypically, null, myoid, neural, combined type were 70.0%, 10.0%, 16.7% and 3.3%, respectively. Seven cases showed metastasis and one case showed recurrence. According to Amin's criteria, 5 benign, 8 borderline and 17 malignant tumors were diagnosed. The NIH's criteria showed 2 very low risk, 6 low risk, 7 intermediate risk, and 15 high risk tumors. Metastasis or recurrence of GISTs had no significant relationship with malignancy according to Amin's criteria (p=0.4069) but had significant correlation with high risk tumor based on NIH's criteria. (p=0.0352).
GISTs showing local invasion, distant metastasis or recurrence were related with high risk tumors based on NIH's criteria. NIH's criteria might be better reliable scheme than Amin's for predicting the prognosis of GISTs.
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ABSTRACT: Seven hundred forty seven cases of gastrointestinal stromal tumors (GISTs) in Koreans who were diagnosed between 2001 and 2002 were analyzed to evaluate their occurrence and their clinical, pathologic and immunohistochemical findings. The most frequent location of tumor was in the stomach (63%), followed by the small intestine (30%), the colorectum (5%), and the esophagus (2%). c-kit expression was found in 93.6% of the cases, while CD34, SMA and S-100 protein was positive in 80.1%, 28.2%, and 20.2%, respectively. c-kit positivity was high in the stomach (94.2%) and small intestine (94.6%), while it was relatively low in the colorectum (85.0%), and esophagus (81.2%). The positivity for CD34 was correlated with the higher risk of GISTs (p = 0.04). Follow up of the patients showed that 58 primary GISTs patients died and 20 of these patients were recurrent or metastatic at the time of diagnosis. The pathologic diagnosis to predict the risk of aggressive behavior of GISTs was correlated with the numbers of tumor, clinical stage, epithelioid histologic type, cellularity, cellular atypia, necrosis, and mucosal invasion (p = 0.00). GISTs with a poor prognosis were closely related to the clinical stage at presentation, the locations of the tumor, and the ages of the patients.Journal of Korean Medical Science 01/2006; 20(6):977-84. DOI:10.3346/jkms.2005.20.6.977 · 1.25 Impact Factor
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ABSTRACT: To investigate the clinicopathological features of gastrointestinal stromal tumor (GIST) and to study the reference indexes for malignancy. Fifty-two cases of primary GIST were distinguished from a group of gastrointestinal mesenchymal tumors using a panel of antibodies such as CD117 and CD34 by immunohistochemical SP method. Their biological behaviors were analyzed using the expression of p21WAF1 and Bax in 52 cases of GIST. Grossly, the tumor size was between 1.5 cm and 13 cm (mean: 5.5 cm). Focal areas of hemorrhage, necrosis, or small cyst formation could be seen. Microscopically, the tumor was composed of spindle cells (20 cases), epithelioid cells (20 cases) and mixed cells (12 cases). Immunohistochemically, CD117 and CD34 showed diffuse strong positive expressions, the positive rates were 98.1% and 92.3%. SMA, S-100, NSE, NF and MBP showed focal positive expressions, the positive rates were 48.1%, 28.8%, 25%, 21.2% and 42.3% respectively. Vimentins were all positive desmin and CgA were all negative. In normal adult stomach and intestine, the immunoreactive staining for CD117 and CD34 showed immunoreactive interstitial cells of Cajal in myenteric neuroplexus. Among the 52 cases of GIST, 27 were positive for p21WAF1 (51.9%), 29 for Bax (55.8%). The expression of p21WAF1 and Bax had no significent difference with the localization, size, histological subtype of GIST, but had a significent difference with the histological grade (P = 0.000, respectively). p21WAF1 expression had a positive correlation to Bax expression (r = 0.461, P = 0.001, kappa = 0.459). GIST has complicated arrangements and various cell types. Positivity of CD117 and CD34 is the most valuable factor in diagnosing GIST. Expression of p21WAF1 and Bax plays an important role in potential malignancy and malignancy rather than in benign GIST. p21WAF1 and Bax may be used as the markers in the assessment of GIST malignant potential.World Journal of Gastroenterology 08/2006; 12(26):4161-5. · 2.43 Impact Factor