A Study Comparing Siltuximab Plus Best Supportive Care to Placebo Plus Best Supportive Care in Anemic Patients With International Prognostic Scoring System Low- or Intermediate-1-Risk Myelodysplastic Syndrome

Inclusion Criteria:

Confirmed diagnosis of myelodysplastic syndrome (MDS), according to World Heath Organization or the French-American-British Cooperative Group pathologic classification, with an International Prognostic Scoring System score 0, 0.5, or 1.0, indicating Low- or INT-1-risk disease.
Documented RBC transfusion of at least 2 units of RBC for the treatment of the anemia of MDS in the 8 weeks preceding the start of the Screening Period.
Adequate iron stores, demonstrated by either the presence of stainable iron in the bone marrow or a serum ferritin of > 100 ng/mL.
Eastern Cooperative Oncology Group (ECOG) performance status score of 0 to 2.
Symptomatic anemia (defined by a score > 0 on the Non-Chemotherapy Anemia Symptom Scale [NCA-SS]).

Exclusion Criteria:

Had treatment with drugs or other agents targeting IL-6 or its receptor within 4 weeks of randomization.
Any condition that, in the opinion of the investigator, would make participation not in the best interest (eg, compromise the well-being) of the patient or that could prevent, limit, or confound the protocol-specified assessments.
Patients with Chronic Myelomonocytic Leukemia (CMML).
Causes other than MDS contributing to anemia, such as Vitamin B12 or folate deficiency, bleeding, hemolysis, hemoglobinopathy, or chronic renal failure.