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Strong association of HMB-45 expression with renal angiomyolipoma
Mehmet Yaldiz1, Nihal Kilinc, Enver Ozdemir
1Dicle Universitesi, Tip Fakultesi, Patoloji ABD, 21280 Diyarbakir, Turkey. myaldiz@dicle.edu.tr
Objective:
Angiomyolipoma (AML) is a benign neoplasm consisting of varying mixtures of smooth muscle, blood vessels and fat. Although, most of these tumors are easy to recognize, some may pose a diagnostic dilemma due to unusual histologic features. Recently, it was suggested that melanosome-associated protein (HMB-45) immunoreactivity may be used for diagnostic confirmation of several neoplasm. The aim of this study is to analyze the diagnostic efficacy of HMB-45 in patients with AML.
Methods:
This study was carried out at the Faculty of Medicine, Department of Pathology, Dicle University, Diyarbakir, Turkey, during the period January 2000 to September 2003. HMB-45 immunoreactivity was analyzed in 6 patients with AML and in 34 patients with other renal and retroperitoneal pathologies, including 10 nephrectomized patients for non-neoplastic reasons by means of immunohistochemistry.
Results:
Patients with AML were positive for HMB-45. Whereas, HMB-45 immunoreactivity was negative in all of the histologic specimens from the patients with renal cell carcinoma, retroperitoneal sarcomas, Wilms' tumor, lipoma, leiomyoma, and nephrectomized kidneys of non-neoplastic reason. The association of AML with HMB-45 immunoreactivity was highly significant (p<0.001).
Conclusion:
Our findings suggest that HMB-45 may not be a melanocyte-restricted marker, and can be useful in differential diagnosis between AML and other tumors seen in kidney and retroperitoneal region.
Insights
HMB-45 immunoreactivity is a significant diagnostic marker for angiomyolipoma (AML). This study found HMB-45 to be highly effective in differentiating AML from other renal and retroperitoneal tumors, aiding in accurate diagnosis.
Area of Science:
- Oncology
- Pathology
- Immunohistochemistry
Background:
- Angiomyolipoma (AML) is a benign neoplasm composed of smooth muscle, blood vessels, and fat.
- Diagnostic challenges can arise from unusual histologic features in AML.
- HMB-45 immunoreactivity has been proposed as a diagnostic marker for various neoplasms.
Purpose of the Study:
- To evaluate the diagnostic efficacy of HMB-45 in identifying angiomyolipoma (AML).
- To assess the utility of HMB-45 in the differential diagnosis of renal and retroperitoneal tumors.
Main Methods:
- Immunohistochemistry was used to analyze HMB-45 expression.
- The study included 6 patients with AML and 34 patients with other renal/retroperitoneal pathologies.
- Control groups included patients with renal cell carcinoma, sarcomas, Wilms' tumor, lipoma, leiomyoma, and non-neoplastic kidneys.
Main Results:
- All patients with angiomyolipoma (AML) showed positive HMB-45 immunoreactivity.
- HMB-45 immunoreactivity was negative in all control groups, including various renal and retroperitoneal tumors.
- The association between AML and HMB-45 positivity was statistically significant (p<0.001).
Conclusions:
- HMB-45 is a valuable marker in the differential diagnosis of angiomyolipoma (AML).
- HMB-45 may not be exclusively a melanocyte marker.
- The findings support the use of HMB-45 for distinguishing AML from other kidney and retroperitoneal tumors.
