Volume 72, Issue 10 (January 2015)                   Tehran Univ Med J 2015, 72(10): 706-716 | Back to browse issues page

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Deyhimi P, Arefian M R, Mahzooni P. Differential diagnosis of fibromatosis and fibrosarcoma with histopathologic characteristics and IHC markers . Tehran Univ Med J. 2015; 72 (10) :706-716
URL: http://tumj.tums.ac.ir/article-1-6463-en.html
1- Department of Oral & Maxillofacial Pathology, Torabinejad Dental Research Center & Dentistry School of Isfahan University of Medical Sciences, Isfahan, Iran , deihimy@dnt.mui.ac.ir
2- Department of Oral & Maxillofacial Pathology, Dentistry School of Isfahan University of Medical Sciences, Isfahan, Iran
3- Department of Pathology, Medical School, Isfahan University of Medical Sciences, Isfahan, Iran
Abstract:   (5157 Views)
Background: Fibromatosis includes a variety of fibroblastic proliferation whose biological trend and histopathological patterns are at intermediate level between benign fibroblastic lesions and fibrosarcoma. Accordingly, because of overlapping of histopathologic features of fibrosarcoma, particularly low-grade type, with fibromatosis, the present study was conducted to find more precise criteria for histopathological and immunohistochemical (IHC) differentiation of these lesions. Methods: In this cross-sectional descriptive analytical study, a total of 40 specimens from pathology department archives in hospitals of Isfahan and Tehran universities from 2003 to 2013, including 20 fibrosarcoma and 20 fibromatosis biopsies, were selected. First, histopathologic characteristics were identified using H&E slides and an optical microscope H&E slides and then they were stained through immunohistochemical staining technique using the EnVision for markers Ki-67 and β-catenin. Afterward the samples were examined by optical microscope and positively stained cells were counted. Results: There was no significant difference between fibromatosis and fibrosarcoma in terms of a mean age (P=0.063), distribution of gender frequency (P=0.197), necrotic rate (P=0.602), clarity of nucleolus (P=0.799) and SID mean of β-catenin marker (0.369). However, it was seen a meaningful difference between fibromatosis and fibrosarcoma in terms of frequency distribution (P=0.017), rate of mitotic figures (P<0.001), rate of herring-bone pattern (P=0.043), rate of cellularity (P<0.001), rate of nucleus overlapping (P<0.001), mean of Ki-67 (P=0.046), mean of Ki-67-limit (P=0.001) and atypia rate (P<0.001). Conclusion: There was a meaningful difference between fibrosarcoma and fibromatosis in terms of mitotic figures, expression of Ki-67 mitotic marker, herring bone pattern, cellularity and atypia. Therefore these features can be used to differentiate the relevant pathological lesions. However, no meaningful difference between two tumors in terms of expression and intensity of β-catenin, clarity of nucleoli and necrosis. This indicates that they are not reliable criteria of differentiation between fibrosarcoma and fibromatosis.
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Type of Study: Original Article |

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