Abstract
Desmoid tumors (desmoid-type fibromatoses) are locally aggressive soft tissue tumors associated with the Wnt/beta-catenin signaling pathway (APC-beta-catenin-Tcf pathway). Matrix metalloproteinase-7, which is one of the target genes of the Wnt/beta-catenin signaling pathway, has been reported to play an important role in tumor progression. We examined the immunohistochemical expression of beta-catenin and matrix metalloproteinase-7 in 72 samples (63 primary and 9 recurrent samples, 63 patients) of sporadic desmoid tumors without familial adenomatous polyposis, and the genetic alteration of the beta-catenin gene in 33 frozen materials (22 primary and 11 recurrent samples, 22 patients). We further examined messenger RNA expression of matrix metalloproteinase 7 by quantitative reverse transcriptase-polymerase chain reaction (RT-PCR) and compared the results with those of normal skeletal muscles. Immunohistochemically, there was a statistically significant correlation between widespread nuclear expression of beta-catenin and overexpression of matrix metalloproteinase-7 (P < .01 in extra-abdominal desmoid, Fisher test). There were 7 missense point mutations in the 22 primary frozen samples (32%). In the beta-catenin mutated group, m...Continue Reading
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