胃腸道基質瘤(Gastrointestinal stromal tumor)，簡稱GIST，是一種在消化道肌肉層或漿膜層發展出來的肉瘤。
體積較小的GIST未必會引起不適。如果腫瘤體積較大，患者則可能會出現以下症狀：6
根據美國一項追蹤1458位GIST患者的研究，歸納出以下不同身體部位的GIST病發比率。7
資料來源：
1.香港肝癌及腸胃癌基金會. 胃腸道基質瘤病發率. hklcf.org/hepatitisb.php?id=15&pid=24 (accessed on 6 Apr 2022)
2. Eisenberg BL, Judson I. Ann Surg Oncol. 2004;11:465-75.
3. Chan KH, Chan CW, Chow WH, et al. World J Gastroenterol. 2006;12:2223-8.
4.活出新基. https://www.gistlock.com.hk (accessed on 6 Apr 2022)
5. American Cancer Society. Key Statistics About Gastrointestinal Carcinoid Tumors. https://www.cancer.org/cancer/gastrointestinal-carcinoid-tumor/about/key-statistics.html (accessed on 6 Apr 2022)
6. American Cancer Society. Signs and Symptoms of Gastrointestinal Carcinoid Tumors. https://www.cancer.org/cancer/gastrointestinal-carcinoid-tumor/detection-diagnosis-staging/signs-symptoms.html (accessed on 6 Apr 2022)
7. Tran T, Davila JA, El-Serag HB. The epidemiology of malignant gastrointestinalstromal tumors: an analysis of 1458 cases from 1992 to 2000. Am JGastroenterol 2005; 100: 162–16
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