Abstract
Acquired cystic disease (ACD)-associated renal cell carcinoma (RCC) has been recently identified. However, there are only a few genetic studies to date. In this article, we performed an immunohistochemical and fluorescence in situ hybridization (FISH) study for six cases including one case with sarcomatoid change. As a result, we observed frequent immunohistochemical expression of AMACR. FISH of chromosome 3 showed trisomy for three cases, monosomy for two cases, and disomy for one case. Additionally, FISH of chromosome 16 showed trisomy for three cases, monosomy for two cases, and both trisomy and monosomy for one case. Furthermore, both the carcinomatous area and the sarcomatoid area of one ACD-associated RCC with sarcomatoid change revealed monosomy of chromosomes 3, 9, and 16 but showed disomy of chromosome 14. In conclusion, the numerical abnormalities of chromosomes 3 and 16, irrespective of gain or loss, may be characteristic of ACD-associated RCC.
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