Immunohistochemical Expression of β-Catenin in Solitary Fibrous Tumors

Abstract

Abstract Context.—Immunohistochemical staining for β-catenin may be used as an indicator of the integrity of the Wnt signaling and β-catenin degradation pathways. Among mesenchymal tumors, aberrant nuclear localization of β-catenin is seen in desmoid-type fibromatoses but has not been described for solitary fibrous tumors that may mimic the former lesions, especially in small biopsy samples. Objective.—To study the immunohistochemical expression of β-catenin in solitary fibrous tumors. Design.—We performed immunohistochemical staining for β-catenin in 12 solitary fibrous tumors, one of which showed histologic features of malignancy. Results.—All the tumors showed strong and diffuse reactivity for β-catenin. Four tumors (33%) showed nuclear staining for β-catenin, whereas the remaining tumors showed either a membranous or mixed membranous and cytoplasmic pattern of staining. The only histologically malignant tumor of the group showed a mixed membranous and cytoplasmic pattern of staining for β-catenin. Conclusions.—Immunohistochemical staining for β-catenin in solitary fibrous tumors does not show a consistent pattern, which may be due to differences in tumorigenesis. Larger studies with clinical follow-up are required for estimating the impact of the variable staining pattern on clinical behavior of these tumors.