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Keywords {🔍}

cancer, cox, colorectal, article, access, expression, privacy, cookies, content, journal, information, publish, search, immunoreactivity, open, data, log, research, cyclooxygenase, sakuma, fujimori, hirabayashi, differentiated, staining, related, discover, medicine, springer, optional, analysis, personal, including, parties, policy, find, track, gastroenterology, relationship, march, cite, kazuhiro, takahiro, kaoru, akira, terano, explore, effects, suggested, cancers, reflects,

Topics {✒️}

ulcerative colitis month download article/chapter eosin-stained specimens revealed colorectal cancer published colorectal cancer screening privacy choices/manage cookies full article pdf colorectal cancer related subjects european economic area nonsteroidal antiinflammatory drugs independent prognostic factor disease-free survival dokkyo university school ki-67 positivity rates conditions privacy policy article sakuma cancer tissue perform immunohistochemical staining check access instant access accepting optional cookies tumor-suppressive effects poorly differentiated adenocarcinoma takahiro fujimori journal finder publish usage analysis march 1999 volume 34 article journal article log cancer information colorectal lesions cell proliferation article cite privacy policy personal data colorectal cancers books a cancerous tissues optional cookies manage preferences stained intensely hirabayashi journal publish subscription content similar content ki-67 expression ki-67 antisera data protection

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         headline:Cyclooxygenase (COX)-2 immunoreactivity and relationship to p53 and Ki-67 expression in colorectal cancer
         description: The tumor-suppressive effects of nonsteroidal antiinflammatory drugs (NSAIDs) have been suggested to be due to a reduction in cyclooxygenase (COX)-2 activity, although the effects of COX-2 in the colonic mucosa and in colorectal cancer have not been determined. Ki-67 immunoreactivity in cancers is also attracting attention, as Ki-67 reflects cell proliferation, while p53 immunoreactivity is also of interest, as it reflects the malignancy of colorectal lesions. Accordingly, to determine these correlation, we investigated the distribution and intensity of COX-2, p53 and Ki-67 expression in both cancerous and non-cancerous tissues from patients with sporadic and ulcerative colitis (UC)-associated colorectal cancer. We selected 21 colorectal cancer specimens, obtained by surgical resection or colonoscopic biopsy, from 21 patients, including 3 with UC (13 men and 8 women; aged 42–78 years). Histological examination of hematoxylin and eosin-stained specimens revealed that 9 were well differentiated; 11, moderately differentiated; and 1 was a poorly differentiated adenocarcinoma. We used anti-COX-2, p53, and Ki-67 antisera to perform immunohistochemical staining by the labelled streptavidin biotin method and then assessed and graded the staining intensity and distribution. COX-2 staining was more intense in cancer tissue than in non-cancerous areas. Colorectal cancers associated with UC were not stained intensely. COX-2, p53, and Ki-67 positivity rates in were 38.1%, 38.1%, and 47.6%, respectively. There were no relationships among the distributions or intensities of COX-2, p53, and Ki-67 expression. Our results indicate that colorectal cancer tissues overexpress COX-2, but that there are no relationships between COX-2, p53, and Ki-67 expression, suggesting that COX-2 expression may not be related to cell proliferation or to the grade of malignancy. However, it is necessary to determine whether COX-2 in cancer tissue is involved in carcinogenesis or whether it is simply a product of cancer.
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