The "masked" nature of the translocation may best be explained by a two-step scenario in which a genuine t(X;18)(p11;q11) has occurred as a first step and a reverse reciprocal X;18 translocation as a second step, leaving the synovial sarcoma-associated SYT-SSX1 fusion intact.     ///    The findings further underline our previous suggestion that SYT-SSX1 fusions may correlate with a biphasic nature of the tumor. 