ASPSCR1 and alveolar soft part sarcoma: The xenograft model of ASPS, established in immunocompromised mice, maintains characteristics consistent with the original ASPS tumor including tumor histology, expression of the ASPL-TFE3 type 1 fusion transcript and the ASPL-TFE3 type 1 fusion protein, as well as maintenance of the t(X;17)(p11;q25) translocation characteristic of ASPS.