AIM: To investigate the expression of Cyclooxygenase-2 (COX-2), proliferating cell nuclear antigen (PCNA), Ki-67 and p53 in gastrointestinal stromal tumors (GISTs) and its relationship with histopathological parameters. METHODS: Twenty-five GISTs were examined by light microscopy and immunohistochemistry. c-kit, CD34, SMA, S-100 protein, COX-2, PCNA, Ki-67 and p53 were detected immunohistochemically and the relationship was evaluated among histopathologic parameters such as mitotic index (MI), tumor grade, tumor size, COX-2, PCNA, Ki-67 and p53. RESULTS: COX-2 protein expression was found in 19 of 25 (76%) of the tumors, and expression was noted in the cytoplasm of the tumor cells. p53 was significantly related to MI and tumor grade but no relationship was found between COX-2, proliferation markers and MI, tumor grade and tumor size. CONCLUSION: COX-2 is expressed in most GISTs and it may play an important role in the proliferation and progression of these tumors or a useful marker to identify GIST. Although immunohistochemical assessment of p53 can be used for distinguishing the risk groups of GISTs, tumor size and mitotic rate should be considered at the same time.
AIM: To investigate the expression of Cyclooxygenase-2 (COX-2), proliferating cell nuclear antigen (PCNA), Ki-67 and p53 in gastrointestinal stromal tumors (GISTs) and its relationship with histopathological parameters. METHODS: Twenty-five GISTs were examined by light microscopy and immunohistochemistry. c-kit, CD34, SMA, S-100 protein, COX-2, PCNA, Ki-67 and p53 were detected immunohistochemically and the relationship was evaluated among histopathologic parameters such as mitotic index (MI), tumor grade, tumor size, COX-2, PCNA, Ki-67 and p53. RESULTS:COX-2 protein expression was found in 19 of 25 (76%) of the tumors, and expression was noted in the cytoplasm of the tumor cells. p53 was significantly related to MI and tumor grade but no relationship was found between COX-2, proliferation markers and MI, tumor grade and tumor size. CONCLUSION:COX-2 is expressed in most GISTs and it may play an important role in the proliferation and progression of these tumors or a useful marker to identify GIST. Although immunohistochemical assessment of p53 can be used for distinguishing the risk groups of GISTs, tumor size and mitotic rate should be considered at the same time.
Authors: G Steinbach; P M Lynch; R K Phillips; M H Wallace; E Hawk; G B Gordon; N Wakabayashi; B Saunders; Y Shen; T Fujimura; L K Su; B Levin; L Godio; S Patterson; M A Rodriguez-Bigas; S L Jester; K L King; M Schumacher; J Abbruzzese; R N DuBois; W N Hittelman; S Zimmerman; J W Sherman; G Kelloff Journal: N Engl J Med Date: 2000-06-29 Impact factor: 91.245
Authors: Abbas Agaimy; Nikolaos Vassos; Peter H Wunsch; Werner Hohenberger; Arndt Hartmann; Roland S Croner Journal: Int J Clin Exp Pathol Date: 2012-01-01
Authors: Chun-Meng Wang; Kai Huang; Ye Zhou; Chun-Yan Du; Yan-Wei Ye; Hong Fu; Xiao-Yan Zhou; Ying-Qiang Shi Journal: J Cancer Res Clin Oncol Date: 2009-12-31 Impact factor: 4.553
Authors: Erika P Berger; Chad M Johannes; Albert E Jergens; Karin Allenspach; Barbara E Powers; Yingzhou Du; Jonathan P Mochel; Leslie E Fox; Margaret L Musser Journal: J Vet Intern Med Date: 2018-10-11 Impact factor: 3.333