The BA patients were characterized by increased frequencies of peripheral “suppressor” glycoprotein-A repetitions predominant protein (GARP)+latency-associated peptide (LAP)+Treg and activated Treg cells as well as MMP-2 and MMP-9 bearing lymphocytes, elevated plasma TIMP-1 levels, increased leukocyte expression of MMP-9, TIMP-1, TIMP-2, IL-6, and TGF-β, and decreased leukocyte expression of IL-21 and T-bet, increased liver expression of FoxP3, TIMP-1, and decreased liver expression of IL-1β and MMP-2. The gene discussed is MMP9; the disease is breast angiosarcoma.