Besides, Th17 cells are potent inducers of matrix metalloproteinase 1 (MMP1) and MMP3 (56), and a study has shown that SS is related to disorders of MMP3/tissue inhibitor of metalloproteinase 1 (TIMP1) and MMP9/TIMP1 ratios (57). The gene discussed is MMP3; the disease is synovial sarcoma.