- Morphological Features of Metastatic Gastrointestinal Stromal Tumors after Gleevec Treatment: Two Cases Report.
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Joon Hyuk Choi, Young Kyung Bae, Sun Kyo Song, Hong Jin Kim, Min Chul Shim, Kyung Hee Lee
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Korean J Pathol. 2009;43(4):368-373.
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DOI: https://doi.org/10.4132/KoreanJPathol.2009.43.4.368
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 Abstract
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- We report two patients with metastatic gastrointestinal stromal tumors (GISTs) with a focus on the morphological features related to Gleevec treatment. In case 1, a 50-year-old woman presented with a 1.8 cm metastatic GIST in the liver after resection of a gastric GIST. Majority of the metastatic tumor showed fibrosis and hyalinization after 8 weeks of Gleevec treatment. CD117-positive cells were present in approximately 1% of the overall tumor. In case 2, a 2 cm and 14 cm metastatic liver masses were found in a 54-year-old man who had a rectal GIST. After 4 weeks of Gleevec treatment, metastatic tumors showed a decrease in size on CT scan. The metastatic tumors showed a decrease in number of tumor cells. The hemorrhage, cystic changes, necrosis, and fibrosis made up approximately 90% of the tumor. The morphological features related to Gleevec treatment are important for correct diagnosis and evaluation of tumor response and prognosis.
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