Whereas anti‐Ro/SSA autoantibodies lack specificity for SS, many studies have shown that high expression of the BAFF coding gene, tumor necrosis factor (TNF) ligand superfamily member 13B (TNFSF13B), is also involved in pSS.1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36. This evidence concerns the gene TNFSF13B and synovial sarcoma.