Incidence and significance of psammoma bodies in Xp 11 . 2 translocation renal cell carcinoma and papillary renal cell carcinoma

The aim of the present study was to investigate the incidence and significance of psammoma bodies (PBs) in Xp11.2 translocation renal cell carcinoma (Xp11.2 tRCC) and papillary renal cell carcinoma (PRCC). The presence of PBs, irregular calcifications, hyaline globules and nested architecture in RCC tissues, which included 47 cases of Xp11.2 tRCC and 95 cases of PRCC, was examined by two pathologists. Compared with PRCC, patients with Xp11.2 tRCC exhibited a higher frequency of PBs, hyaline globules and nested architecture. The presence of PBs in combination with the occurrence of a nested architecture achieved a specificity of 93.7% when diagnosing Xp11.2 tRCC. However, there were no significant differences in the overall survival between patients with and without PBs in both types of RCC. Therefore, the presence of PBs combined with nested architecture may provide guidance for the diagnosis of Xp11.2 tRCC; however, PBs cannot predict tumor behavior in Xp11.2 tRCC or PRCC.

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