Identification of mucin depleted foci in the human colon

Cancer Prevention Research
Angelo Pietro FemiaGiovanna Caderni

Abstract

Aberrant crypt foci (ACF) originally described in rodents treated with colon-specific carcinogens have been identified also in humans at high risk of colon cancer (CRC) and are extensively used as cancer biomarkers. However, studies documenting the heterogeneity of ACF have questioned their precancerous nature. Recently, we described dysplastic foci depleted of mucins (MDF) in the colon of rats treated with colon-specific carcinogens. Like colon tumors, MDFs show activation of Wnt signaling driven by mutations in the beta-catenin gene and Apc, a key gene in colorectal carcinogenesis. Because MDFs have been identified thus far only in rodents, we wanted to search for similar lesions in humans. Familial adenomatous polyposis (FAP) subjects, carrying germ-line mutations in the APC gene, are at high risk of CRC. Therefore, we first searched for MDF-like lesions in unsectioned colon samples from FAP patients and then in patients with sporadic CRC. MDFs were present in the colon of FAP patients (average of 0.0577 lesions/cm(2)) and at a much lower density in CRC patients (average of 0.0006 lesions/cm(2)). ACFs were also observed in all patients. Histologic preparations of all the MDFs identified in FAP and CRC consisted of microadeno...Continue Reading

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