Total protein < g/L or substitution dependency Worsening urinary paraproteinemia will be considered in the context of International Myeloma Working Group (IMWG) disease response criteria on a monthly basis; any patient with urinary protein (otherwise unrelated to urinary myeloma associated monoclonal [M]-protein) with excretion > . g/day will be considered to have developed nephrotic-range proteinuria, and will be taken off study Within days prior to cycle day of treatment: Urinary albumin excretion < . g/ hours (as estimated by urine protein-creatinine ratio) Elevated C-reactive protein (CRP) (CRP > mg/L) probably or definitely attributable to KSHV-MCD Urinary protein excretion =< mg/day Presence of serum and/or urinary monoclonal protein Patients must not have a known thrombophilic condition (i.e. protein S, protein C or antithrombin III deficiency, Factor V Leiden, Factor II GA mutation, homocysteinemia or antiphospholipid antibody syndrome); testing is not required in patients without thrombophilic history Urinary protein is <+. Have persistent + protein by urinalysis (patients with + proteinuria that have a spot protein:creatinine ratio of less than . may be enrolled) or a history of nephrotic syndrome. Prior treatment with TRC or axitinib or any agent targeting the endoglin pathway (including a fusion protein that binds bone morphogenic protein) Total protein > . mGPS of : C-reactive protein > mg/L and albumin ? g/L mGPS of : C-reactive protein > mg/L and albumin < g/L modified Glasgow prognostic score (mGPS) of : CRP > mg/L and albumin ? g/L mGPS of : C-reactive protein (CRP) > mg/L and albumin < g/L mGPS of : C-reactive protein (CRP) > mg/L and albumin ? g/L mGPS of : CRP > mg/L and albumin < g/L C-reactive protein > mg/L AND albumin ? g/L; Score = C-reactive protein > mg L AND albumin < g/L; Score = Have persistent + protein by urinalysis (patients with + proteinuria that have a spot protein:creatinine ratio of less than . may be enrolled) or a history of nephrotic syndrome. Urinary M-protein excretion at least mg/ hours; or Subjects must have a C-reactive protein (CRP) > mg/L C-reactive protein (CRP) must be >= mg/l in the absence of any other more likely cause of increased CRP like an infection or an autoimmune disorder Total protein within x ULN Patient must not have a known thrombophilic condition (i.e. protein S, protein C or antithrombin III deficiency, Factor V Leiden, Factor II GA mutation, homocysteinemia, or antiphospholipid antibody syndrome); testing is not required in patients without a thrombophilic history Urinary M-protein excretion at least mg/ hours; or C-reactive protein > mg/L Known protein C, protein S, or anti-thrombin deficiency or other known thrombophilic disorders