We identified a novel chromosomal translocation t(17;19)(p13;q13) in a pediatric UDS and have characterized this alteration to show rearrangement of the MLL4 and GPS2 genes, resulting in an in-frame fusion gene MLL4-GPS2, the expression of which promotes anchorage-independent growth.     ///    Identification of an MLL4-GPS2 fusion as an oncogenic driver of undifferentiated spindle cell sarcoma in a child.. 