Renal angiomyolipoma (AML) and perivascular epithelioid cell tumor (PEComa) are members of the microphthalmia-associated transcription factor (MiTF) family of tumors. Traditionally, HMB45 and MelanA have been used to diagnose these lesions; however, low sensitivity can render interpretation difficult. PNL2 is a sensitive and specific biomarker for epithelioid melanoma, and immunoreactivity has also been shown in small series of PEComas. This study determined the utility of PNL2 in MiTF and non-MiTF renal tumors.PNL2 immunostaining was performed on 196 tumors, including 40 MiTF renal tumors (AMLs, epithelioid AMLs, sclerosing PEComas, malignant PEComas, and Xp11.2 renal cell carcinomas (RCCs)) and 156 non-MiTF renal tumors. HMB45, MelanA and CathepsinK were also evaluated in a subset of MiTF tumors. Overall, 85
作者:Previn, Gulavita;Christopher D M, Fletcher;Michelle S, Hirsch
来源:Histopathology 2017 年