Furthermore, six of the translocations, namely the t(11;22), t(21;22), and t(7;22) of Ewing's sarcoma, the t(12;22) of clear cell sarcoma, the t(12;16) of myxoid liposarcoma, and the t(11;22) of desmoplastic small round cell tumor, achieve this following a peculiar pattern, consisting in the fusion of a gene with an RNA-binding domain (EWS or TLS) with a transcription factor gene (FLI1, ERG, ETV1, ATF-1, CHOP, or WT1).
Thus, rearrangements of the CHOP gene appear to be specific for myxoid liposarcoma with t(12;16) and are not associated with lipoblastic differentiation.
Circumstantial evidence suggests that genetic changes may lead to tumor progression within the myxoid liposarcoma tumors (MLTs) carrying non-random chromosomal translocation t(12;16).
Myxoid liposarcoma (LS), the most common subtype of LS, is known to be characterized by the specific t(12;16) resulting in a TLS-CHOP fusion in almost all cases.
Herein, we report for the first time a novel secondary clonal translocation, t(2;4) (q23;p14) in addition to t(12;16)(q13; p11.2) in a 30-year-old woman with myxoid liposarcoma on the left posterior thigh region without any prior chemoradiation therapy.