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- W2044771830 abstract "Aberrant crypt foci (ACF) and mucin-depleted foci (MDF) have recently been recognized as pre-neoplastic lesions in the colon of carcinogen-treated rodents. In the present study, we analyzed the sequential development of ACF and MDF histopathologically in the colon of rats from 5 to 40 weeks after DMH treatment. The numbers of ACF per colon increased over time during the experiment, and were much higher than the number in tumors, while the number of MDF per colon remained unchanged from the early stage (the 5th week after carcinogen exposure), and approximate to those in tumors. The incidence of ACF, which was much higher than that of tumors, also increased gradually in a time-dependent manner. The incidence of MDF, however, was similar to that of tumors and did not change significantly during the whole experiment. No lesion as dysplasia with high-grade (DHG) or adenocarcinoma (AC) were found in any large ACF from the 5th to 40th week histopathologically, whereas all of the large MDF showed DHG or AC features. Even at 5 weeks, MDF showed features of DHG. We classified these into two forms of MDF: flat and protruded MDF. At 40 weeks, the number of flat MDF per colon decreased significantly compared with that at 20 weeks (p<0.05), however, the number of protruded MDF per colon increased (p<0.01), and the percentage of DHG in a protruded MDF lesion decreased but that of AC increased remarkably. In conclusion, MDF may develop into cancer through the so-called 'de novo cancer' pathway." @default.
- W2044771830 created "2016-06-24" @default.
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- W2044771830 date "2012-01-26" @default.
- W2044771830 modified "2023-09-30" @default.
- W2044771830 title "Pre-neoplastic lesion, mucin-depleted foci, reveals de�novo high-grade dysplasia in rat colon carcinogenesis" @default.
- W2044771830 doi "https://doi.org/10.3892/or.2012.1657" @default.
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