Synovial sarcoma is defined by recurrent t(X;18)(p11;q11) translocations creating SS18–SSX1, SS18–SSX2 or SS18–SSX4 fusions. Recently, a novel rabbit monoclonal antibody designed to identify these fusions (SS18–SSX, clone E9X9V) was proposed… Click to show full abstract
Synovial sarcoma is defined by recurrent t(X;18)(p11;q11) translocations creating SS18–SSX1, SS18–SSX2 or SS18–SSX4 fusions. Recently, a novel rabbit monoclonal antibody designed to identify these fusions (SS18–SSX, clone E9X9V) was proposed to be highly specific (100%), but not completely sensitive (95%) for this diagnosis. Another antibody designed to identify the C‐terminal end of SSX (SSX_CT, clone E5A2C) was proposed to be highly sensitive (100%), but not completely specific (96%). We sought to validate these antibodies in an independent cohort.
               
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