Study of CC-5013 to Evaluate Safety, Pharmacokinetics and Effectiveness for Japanese Patients With Symptomatic Anemia Associated With Myelodysplastic Syndrome With a Del(5)(q31-33) Abnormality.

Maximum observed plasma concentration of lenalidomide after a single dose on Day and after multiple doses (Day 4).

Time to maximum observed plasma concentration of lenalidomide after a single dose on Day 1 and multiple doses (Day 4).

Area under the plasma concentration-time curve from time zero to the last measurable concentration (AUCt) of lenalidomide after a single dose on Day 1 and multiple doses (Day 4).

Area under the plasma concentration-time curve over the dosing interval (AUCτ) of lenalidomide after a single dose on Day 1 and multiple doses (Day 4).

Area under the plasma concentration-time curve from time zero to infinity (AUC∞) of lenalidomide after a single dose on Day 1.

The apparent terminal half-life is the time required for plasma concentration to decrease by 50% after pseudo-equilibrium of distribution has been reached, and calculated as the natural logarithm of 2 (0.693) / Apparent terminal rate constant (λz).

Apparent volume of distribution of lenalidomide after a single dose on Day 1 and multiple doses (Day 4).

Apparent total plasma clearance (CL/F) of lenalidomide after a single dose on Day 1 and multiple doses (Day 4).

Apparent terminal elimination rate constant of lenalidomide determined after a single dose on Day 1 and multiple doses (Day 4).

Erythroid response was determined using the International Working Group (IWG) 2000 criteria, categorized as a major response or minor response.

A major response in patients with transfusion-dependent anemia (receiving ≥ 4.5 units of red blood cell (RBC) transfusion during 56 consecutive days at Baseline) is defined as RBC transfusion independence accompanied by a ≥1.0 g/dL increase from Baseline in hemoglobin sustained for 56 days consecutively during the treatment period. In patients with transfusion-independent anemia with hemoglobin < 10 g/dL at Baseline a major response is defined as a > 2.0 g/dL increase from Baseline in hemoglobin sustained for consecutive 56 days.

Minor response in patients with transfusion-dependent anemia defined as ≥ 50% decrease from Baseline in transfusion requirements sustained for consecutive 56 days, and in transfusion-independent patients as 1.0 to 2.0 g/dL increase from Baseline in hemoglobin sustained for consecutive 56 days.

Time to erythroid response was calculated as the time from the first dose of study drug to the start of the first major or minor erythroid response. Similarly, time to major erythroid response was calculated as the time from the first dose of study drug to the start of the first major erythroid response.

Duration of erythroid response was calculated as the time from the start of the first major or minor erythroid response to the end of the response. Similarly, duration of major erythroid response was calculated as the time from the start of the first major erythroid response to the end of the response. Response duration was censored at the last adequate assessment for patients who maintained response.

Change in hemoglobin concentration from Baseline to the maximum observed value during the major erythroid response period for major erythroid responders.

Neutrophil response was determined using the IWG (2000) criteria. A major response for participants with a Baseline neutrophil count < 1,500/mm^3 is defined as a ≥ 100% increase or a ≥ 500/mm^3 increase, whichever is greater, sustained for consecutive 56 days during the treatment period.

A minor response for participants with a Baseline neutrophil count < 1,500/mm^3 is defined as a ≥ 100% increase, but an absolute increase < 500/mm^3, sustained for consecutive 56 days during the treatment period.

Platelet response was determined using the IWG (2000) criteria. Major response in patients with Baseline platelet count < 100,000/mm^3 is defined as a ≥ 30,000/mm^3 increase sustained for consecutive 56 days during the treatment period. In platelet-transfusion-dependent patients at Baseline a major response is defined as stabilization of platelet counts and platelet transfusion independence sustained for consecutive 56 days during the treatment period.

Minor response in patients with Baseline platelet count < 100,000/mm^3 is defined as a ≥ 50% increase in platelet count with an absolute increase > 10,000/mm^3 and < 30,000/mm^3 sustained for consecutive 56 days during the treatment period.

Cytogenetic (chromosome structure) abnormalities were assessed by a central cytogenetic reviewer based on prints and cytogenetic reports of the bone marrow sample from the central laboratory. Cytogenetic response was determined using the IWG (2000) criteria and categorized as either a major response or minor response. Twenty metaphases were analyzed for the determination of cytogenetic response.

A major response was defined as no detectable cytogenetic abnormality, if an abnormality was present at Baseline, sustained for consecutive 56 days during the treatment period. A minor response was defined as ≥ 50% reduction from Baseline in abnormal metaphases sustained for consecutive 56 days during the treatment period.

Bone marrow morphology was assessed by the central hematologic reviewers based on the locally-prepared bone marrow smear slide and clot section.

Bone marrow morphology was assessed by the central hematologic reviewers based on the locally-prepared bone marrow smear slide and clot section.

Bone marrow morphology was assessed by the central hematologic reviewers based on the locally-prepared bone marrow smear slide and clot section.