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Hereditary Tumor Research Project [M. M., T. Ii., J. K.] and Departments of Surgery [M. Y., T. M.], Pathology [Y. H., M. K.], and Neurosurgery [N. S.], Tokyo Metropolitan Komagome Hospital, Tokyo 113-8677; Kyoundo Hospital Sasaki Institute, Tokyo 101-0062 [T. Iw.]; and Institute of Molecular Oncology, Showa University, Tokyo 142-8555 [M. M., T. Ii., T. K.], Japan.
Hereditary nonpolyposis colorectal cancer (HNPCC) is characterized by defective DNA mismatch repair, which results in genetic instability of tumors; however, only a few target genes have been recognized. Our previous study detected a low frequency of APC gene mutation (21%) in colorectal tumors from HNPCC patients, in contrast to a high frequency of APC gene alteration (>70%) in non-HNPCC tumors. Because both ß-catenin and ACP gene mutations have recently been shown to activate the same signaling pathway, we analyzed ß-catenin mutation in HNPCC tumors. A notable frequency of ß-catenin gene mutation (43%, 12 of 28) was found to occur in HNPCC colorectal tumors. ß-Catenin mutations were not detected in tumors with APC mutations. All ß-catenin mutations detected in HNPCC tumors existed within the regulatory domain of ß-catenin. Immunohistochemical staining of tumors with this mutation showed accumulation of ß-catenin protein in nuclei. These and previous data from our laboratory suggest that activation of the ß-catenin-Tcf signaling pathway, through either ß-catenin or APC mutation, contributes to HNPCC colorectal carcinogenesis in
65% of cases.
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