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- W2030751385 abstract "Cyclooxygenase-2 (COX-2) has been shown to have an important role in carcinogenesis. Elevated COX-2 expression has been reported in several human tumours, including colorectal cancer (CRC) and appears to correlate with survival inversely. Regular use of non-steroidal anti-inflammatory drugs (NSAIDs) can decrease the incidence of CRC, but prolonged administration may cause side effects. Selective COX-2 inhibitors have comparable effects to NSAIDs with reduced side effects. The aim of the present study was to analyse the potential therapeutic role of rofecoxib, a selective COX-2 inhibitor, in experimentally induced rat colorectal tumours.Sixty-three Wistar male rats (33 in the experimental group and 30 in the control group) received subcutaneous injections of 1,2-dimethylhydrazine (DMH). Synchronal with the first injection of DMH in the experimental group, rats were given rofecoxib orally for 6 months, when autopsy was done. Colorectal tumours were evaluated quantitatively and histopathologically for the presence of aberrant crypt foci (ACF), adenomas and adenocarcinomas.No statistically significant differences were found in the number of dysplastic ACF between the experimental and control groups (p > 0.05). However, a significant lower incidence of adenomas (p < 0.05), adenocarcinomas (p < 0.05) and decreased volume of macroscopically visible tumours (by 42%) was found in the experimental group. Furthermore, no significant differences were evaluated between the groups according to the degree of dysplasia and Dukes stage. In the experimental group, chronic ulcerations were found in the upper gastrointestinal tract in 9% of the rats.Our data suggest that rofecoxib effectively inhibits tumour growth and progression but not tumour initiation." @default.
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- W2030751385 date "2005-01-01" @default.
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- W2030751385 title "Rofecoxib does not inhibit aberrant crypt foci formation but inhibits later steps in the development of experimental colorectal cancer: Rofecoxib in experimental colon cancer" @default.
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- W2030751385 doi "https://doi.org/10.1080/00365520410009519" @default.
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