TFE3 and renal cell carcinoma associated with Xp11.2 translocations/TFE3 gene fusions: In this study, we focused on two Xp11.2 tRCC cell lines, UOK109 from NonO-TFE3 fusion and UOK120 from PRCC-TFE3 fusion tRCC, to explore intracellular distribution of the fusion TFE3 proteins and possible pathogenic mechanisms as a result of changes in intracellular localization of the fusion TFE3 proteins.