Abstract
Objective: The adenomatous polyposis coli (APC) and β-catenin (CTNNB1) genes are the two major components of the Wnt signaling pathway that has been shown to play an important role in the formation of certain cancers. The overactivation of the pathway, which results in abnormal accumulation of β-catenin protein in nuclei, contributes to most colorectal cancers (CRCs), both sporadic and hereditary, as well as sporadic endometrial cancers (ECs). Here, we studied the involvement of APC and β-catenin in hereditary nonpolyposis colorectal cancer (HNPCC)-related ECs, and compared the expression patterns to those in HNPCC-related CRCs. Materials and methods: Nineteen ECs and 31 CRCs derived from HNPCC patients were immunohistochemically stained with anti-APC- and anti-β-catenin –antibodies. Results: Tumor-specific loss of APC was observed in 16 of endometrial cancers (3 of 19) and in 39 of colorectal cancers (12 of 31). Consistently, the loss of APC expression was associated with nuclear β-catenin staining. Altogether, aberrant β-catenin localization was observed in 53 of ECs (10 of 19) as compared to 84 of CRCs (26 of 31) (P=0.02).Conclusion: Our results suggest a frequent overactivation of the Wnt signaling pathway in hereditary endometrial cancer. In accordance with studies on sporadic cancers, abnormal accumulation of β-catenin protein in nuclei occurred much less frequently in HNPCC-related ECs than CRCs, which may reflect organ-specific differences in their pathogenesis.
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Abbreviations
- APC:
-
adenomatous polyposis coli
- EC:
-
endometrial cancer
- CRC:
-
colorectal cancer
- GSK-3β:
-
glycogen synthase kinase −3β
- HNPCC:
-
hereditary nonpolyposis colorectal cancer
- MSI:
-
microsatellite instability
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Kariola, R., Abdel-Rahman, W.M., Ollikainen, M. et al. APC and β-catenin protein expression patterns in HNPCC-related endometrial and colorectal cancers. Familial Cancer 4, 187–190 (2005). https://doi.org/10.1007/s10689-004-6130-4
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DOI: https://doi.org/10.1007/s10689-004-6130-4