TNFSF13B and synovial sarcoma: As there is no sequential order in the development of this disease and numerous factors seem to contribute to the progression of the condition, this section will review the pathophysiology focusing on the role of epithelial cells, cytokines, T-lymphocytes and B-cell activating factor (BAFF) in the pathology of SS as well as the autoantibodies secreted by B lymphocytes.