TFE3 and renal cell carcinoma: Compared with the results of the FISH assay, the 6 cases of Xp11.2 tRCCs that were confirmed by PCR were positive in the break-apart FISH assay and the 2 cases of ASPL-TFE3 RCC confirmed by PCR showed concordant results with the ASPL-TFE3 dual-fusion FISH assay.