In total, a group of 42 cases are discovered with MEF2D rearranged to BCL9, CSF1R, DAZAP1 (DAZ (deleted in azoospermia)-associated protein 1), HNRNPUL1 (heterogeneous nuclear ribonucleoprotein U-like 1), SS18 (synovial sarcoma translocation, chromosome 18) or FOXJ2 (Forkhead Box J2). This evidence concerns the gene SS18 and synovial sarcoma.