eight genetically confirmed t(X;17)(p11;q25) carcinomas, harboring the ASPSCR1-TFE3 gene fusion.     ///    "However, the expression of cathepsin K in specific genetic subtypes of Xp11 translocation carcinomas, as well as alveolar soft part sarcoma, which harbors the same ASPSCR1-TFE3 gene fusion as some Xp11 translocation carcinomas, has not been addressed. "    ///    "and 18 alveolar soft part sarcomas (12 genetically confirmed), harboring the identical ASPSCR1-TFE3 gene fusion. "    ///    "Expression of cathepsin K distinguishes alveolar soft part sarcoma from the ASPSCR1-TFE3 carcinoma, harboring the same gene fusion."    ///    "Expression of cathepsin K distinguishes alveolar soft part sarcoma from the ASPSCR1-TFE3 carcinoma, harboring the same gene fusion. "    ///    "The latter can be useful diagnostically, especially when alveolar soft part sarcoma presents in an unusual site (such as bone) or with clear cell morphology, which raises the differential diagnosis of metastatic ASPSCR1-TFE3 renal cell carcinoma. "    ///    "In contrast, all eight ASPSCR1-TFE3 carcinomas were completely negative for cathepsin K. "    ///    "The difference in expression of cathepsin K between the PRCC-TFE3 and ASPSCR1-TFE3 carcinomas, together with the observed clinical differences between these subtypes of Xp11 translocation carcinomas, suggests the possibility of functional differences between these two related fusion proteins.. "