OR is defined as the number of participants achieving an objective response (complete response [CR], CR with incomplete bone marrow recovery [CRi], partial response [PR], and nodular PR [nPR]), after 3 cycles, after 6 cycles, and after the last dose of ofatumumab and bendamustine treatment. CR (all the criteria at least 2 months after last treatment): no lymphadenopathy (Ly)/ hepatomegaly/ splenomegaly/ constitutional symptoms; neutrophils >1500 per microliter (µL), platelets (PL) >100,000/µL, hemoglobin (Hb) >11 grams/deciliter (g/dL), lymphocytes (LC) <4000/µL, bone marrow (BM) sample must be normocellular for age, <30% LC, no lymphoid nodule. CRi: CR criteria, persistent anemia/thrombocytopenia/neutropenia unrelated to CLL but related to drug toxicity. PR: >=50% decrease in LC, Ly, size of liver and spleen and at least one of the following results: PL >100,000/µL or 50% improvement over Baseline (BL), Hb >11 g/dL or 50% improvement over BL, LC <4000/µL. nPR: persistent nodules BM.

As-treated subjects (ATS) Population: all participants who received at least one dose of both study drugs (ofatumumab and bendamustine). OR was measured using the International Workshop for CLL (IWCLL) updated National Cancer Institute-sponsored Working Group (NCI-WG) guidelines 2008. The 95% exact binomial confidence interval is for CR+CRi+nPR+PR.

OR is defined as the number of participants achieving an objective response (complete response [CR], CR with incomplete bone marrow recovery [CRi], partial response [PR], and nodular PR [nPR]), after 3 cycles, after 6 cycles, and after the last dose of ofatumumab and bendamustine treatment. CR (all the criteria at least 2 months after last treatment): no lymphadenopathy (Ly)/ hepatomegaly/ splenomegaly/ constitutional symptoms; neutrophils >1500 per microliter (µL), platelets (PL) >100,000/µL, hemoglobin (Hb) >11 grams/deciliter (g/dL), lymphocytes (LC) <4000/µL, bone marrow (BM) sample must be normocellular for age, <30% LC, no lymphoid nodule. CRi: CR criteria, persistent anemia/thrombocytopenia/neutropenia unrelated to CLL but related to drug toxicity. PR: >=50% decrease in LC, Ly, size of liver and spleen and at least one of the following results: PL >100,000/µL or 50% improvement over Baseline (BL), Hb >11 g/dL or 50% improvement over BL, LC <4000/µL. nPR: persistent nodules BM.

ATS Population. OR was measured using the International Workshop for CLL (IWCLL) updated National Cancer Institute-sponsored Working Group (NCI-WG) guidelines 2008.

Response was determined according to the IWCLL updated NCI-WG guidelines 2008. CR requires all of the following criteria at least 2 months after the last treatment: no lymphadenopathy (Ly)/ hepatomegaly/ splenomegaly/ constitutional symptoms; neutrophils >1500/µL, platelets (PL) >100,000/µL, hemoglobin (Hb) >11.0 g/dL, lymphocytes (LC) <4000/µL, bone marrow (BM) sample must be normocellular for age, <30% LC, no lymphoid nodule.

ATS Population

Time to response is defined as time from date of the first administration of study treatment to the first response (CR, CRi, nPR, or PR). Response was determined according to the IWCLL updated NCI-WG guidelines 2008. CR: all of the following criteria at least 2 months after last treatment: no lymphadenopathy (Ly)/ hepatomegaly/ splenomegaly/ constitutional symptoms; neutrophils >1500 per microliter (µL), platelets (PL) >100,000/µL, hemoglobin (Hb) >11.0 grams/deciliter (g/dL), lymphocytes (LC) <4000/µL, bone marrow (BM) sample must be normocellular for age, <30% LC, no lymphoid nodule. CRi: CR criteria, persistent anemia/ thrombocytopenia/ neutropenia unrelated to CLL but related to drug toxicity. nPR: persistent nodules BM. PR: >=50% decrease in LC, Ly, size of liver and spleen and at least one of the following results: PL >100,000/µL or 50% improvement over Baseline (BL), Hb >11.0 g/dL or 50% improvement over BL, LC <4000/µL.

ATS Population. Only participants who had a response (CR, CRi, nPR, or PR) were evaluated.

The duration of response is defined as the time from the initial response (CR, CRi, nPR, or PR) to the first documented sign of disease progression (PD) or death due to any cause. PD requires at least one of the following: new lesion or increase by >=50% from Baseline in lymphocytes (LC) with at least 5000B-lymphocytes per microliter (5.0 x 10^9/L), lymphadenopathy (Ly), size of liver and spleen, platelets (PL) >= 50% decrease from Baseline, or to <100,000/uL secondary to CLL, hemoglobin (Hb) decrease of >2 g/dL from Baseline or to <10 g/dL secondary to CLL, CLL- transformation, cytopenia after treatment. Response was determined according to the IWCLL updated NCI-WG guidelines 2008.

ATS Population. Only participants with an initial response (CR, CRi, nPR, or PR) with PD or death were assessed for duration of response.

PFS is defined as the interval of time between the date of the first administration of study treatment and the earlier of the date of disease progression (PD) and the date of death due to any cause. PD requires at least one of the following:new lesion or increase by >=50% from BL in LC, Ly, size of liver and spleen, PL >= 50% decrease from BL, or to <100,000/uL secondary to CLL, Hb decrease of >2 g/dL from BL or to <10 g/dL secondary to CLL, CLL- transformation. Response was determined according to the IWCLL updated NCI-WG guidelines 2008. Participants who have neither progressed or died at the time of analysis were censored at the date of the last adequate assessment. If there was more than 1 scheduled visit missed, PFS is censored at the last adequate assessment of response. An adequate assessment is defined as an assessment where the investigator determined a response of CR, CRi, nPR, PR, or stable disease (SD).

All Treated Subjects' (ATS) population. N= Progression or Death

OS is defined as the interval of time between the date of the first administration of study treatment and the date of death due to any cause. For participants who did not die, time of death was censored at the date of last contact.

All treated subjects. N= Death

Time to progression is defined as the time from the date of the first administration of study treatment to disease progression (PD). PD requires at least one of the following: new lesion or increase by >=50% from Baseline in lymphocytes (LC) with at least 5000 B-lymphocytes per microliter (5.0 x 10^9/L), lymphadenopathy (Ly), size of liver and spleen, platelets (PL) >= 50% decrease from Baseline, or to <100,000/uL secondary to CLL, hemoglobin (Hb) decrease of >2 g/dL from Baseline or to <10 g/dL secondary to CLL, CLL- transformation, cytopenia after treatment. Response was determined according to the IWCLL updated NCI-WG guidelines 2008.

All treated subjects (ATS). This analysis includes patients who had progression.

Time to next therapy is defined as the time from the date of the first administration of study treatment until the start of the next anti-CLL therapy.

ATS Population. Only participants that took anti-CLL therapy were evaluated.

An AE is defined as any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a medicinal product. An SAE is defined as any untoward medical occurrence that, at any dose, results in death, is life threatening, requires hospitalization or prolongation of existing hospitalization, results in disability/incapacity, is a congenital anomaly/birth defect, or is an event of possible drug-induced liver injury. Refer to the general Adverse AE/SAE module for a complete list of AEs and SAEs.

Safety Population: all participants who received at least one dose of any study treatment (ofatumumab or bendamustine).

Immunoglobulins, or antibodies, are large proteins used by the immune system to identify and neutralize foreign particles such as bacteria and viruses. Their normal blood levels indicate proper immune status. Low levels indicate immuno-suppression. IgA, IgG, and IgM were measured in the blood samples of the participants. Baseline IgA, IgG, and IgM values are the last pre-dose assessment values performed on cycle 1 Day 1. Change from Baseline was calculated as the post-Baseline value minus the Baseline value.

Safety Population. Only those participants who were available at the indicated time points were analyzed.

CD5+ CD19+ cells were counted by flow cytometry. Flow cytometry is a technique for counting and examining microscopic particles with an electronic detection apparatus. Baseline CD5+ CD19+ cell count value is the last pre-dose assessment values performed on cycle 1 Day 1. Change from Baseline was calculated as the post-Baseline value minus the Baseline value.

ATS Population. Only those participants with data available at the specified time points were analyzed (represented by n=X, X in the category titles).

CD5-CD19+ cells were counted by flow cytometry. Flow cytometry is a technique for counting and examining microscopic particles with an electronic detection apparatus. Baseline CD5- CD19+ cell count value is the last pre-dose assessment values performed on cycle 1 Day 1. Change from Baseline was calculated as the post-Baseline value minus the Baseline value.

Safety Population. Only those participants with data available at the specified time points were analyzed (represented by n=X, X in the category titles).

MRD refers to small number of leukemic cells that remain in the participant during treatment or after treatment at the time the participant achieved a confirmed CR. MRD analysis was performed for the partcipants who were suspected of achieving a primary endpoint CR. Analysis of CD5+ CD19+ was performed on the bone marrow aspirate sample obtained no sooner than 2 months following the last dose of study treatment. MRD results were reported as negative or positive. The absence of MRD (negative MRD) is defined as less than one CLL cell per 10000 leukocytes.

ATS Population. Number of subjects who had CR with bone marrow confirmation are included. Only those participants with data available at the specified time points were analyzed.

Participants who received no transfusion and at least one transfusion during the study are presented. Participants who took any blood products are counted in this table.

Safety Population: All subjects who receive at least one dose of study medication.

AIHA is a disease where the body's immune system fails to recognize red blood cells as "self" and begins destroying these red blood cells. The number of participants diagnosed with AIHA are presented.

Safety Population All subjects who receive at least one dose of study medication.

Participants with a Grade 3 or Grade 4 myelosuppression (anemia, neutropenia, and thrombocytopenia) are presented. Myelosuppression is defined as the decrease in the ability of the bone marrow to produce blood cells. AEs were graded according to NCI common terminology criteria for adverse events (CTCAE) grade, version 4.0 (1, mild; 2, moderate; 3, severe; 4, life-threatening/disabling; 5, death).

Safety Population

Participants with the indicated Grade 3 or Grade 4 adverse event of infection are presented. AEs were graded according to the NCI CTCAE grade, version 4.0 (1, mild; 2, moderate; 3, severe; 4, life-threatening/disabling; 5, death).

Safety Population: All subjects who receive at least one dose of study medication.

Participants with the indicated constitutional or B-symptoms (night sweats, weight loss, fever or extreme fatigue) were presented for different time points.

Safety Population: All subjects who receive at least one dose of study medication. Only those participants with data available at the specified time points were analyzed (represented by n=X, X in the category titles).

The ECOG performance status scales and criteria are used by doctors and researchers to assess how a participant's disease is progressing, assess how the disease affects the daily living abilities of the participant, and determine appropriate treatment and prognosis. Grade 0, fully active, able to carry on all pre-disease performance without restriction. Grade 1, restricted in physically strenuous activity but ambulatory and able to carry out work of a light or sedentary nature, e.g., light house work, office work. Grade 2, ambulatory and capable of all selfcare, but unable to carry out any work activities; up and about more than 50% of waking hours. Grade 3, capable of only limited selfcare; confined to bed or chair more than 50% of waking hours. Grade 4, completely disabled; cannot carry on any selfcare; totally confined to bed or chair. Grade 5, dead.

Safety Population. All subjects who receive at least one dose of study medication.. Only those participants with data available at the specified time points were analyzed (represented by n=X, X in the category titles).

The presence of HAHA in human serum was determined using a validated electrochemiluminescent assay in a multi-tier assay format. All samples were first assessed in a screening (SCR) assay, and the potential positive (Pos) samples were further tested in the confirmation (CNF) assays. Confirmed positives were reported as HAHA positive and titer was determined for each positive sample. The drug tolerance of the HAHA assay is 200 microgram/milliliter (µg/mL); thus, samples that tested negative in the assay and had ofatumumab concentrations no more than 200 µg/mL were considered as conclusive negative (C Neg) results.

Safety Population. Only those participants with data available at the specified time points were analyzed (represented by n=X, X in the category titles).

Lymph nodes were evaluated by physical examination which involved recording the diameter in two planes (sum of the product of the diameter [SPD]) of the largest palpable node in each of the following sites: cervical, axillary, supraclavicular, inguinal and femoral. Lymphadenopathy is defined as lymph nodes with the largest diameter greater than 1.5 centimeters. The maximum reduction in SPD from Baseline at C2D1, C3D1, C4D1, C5D1, C6D1, 3-Month F/U, 6-Month F/U and 9-Month F/U are provided.

ATS Population. Only those participants with data available at the specified time points were analyzed (represented by n=X, X in the category titles).

Organomegaly is the abnormal enlargement of organs. Physical examination of the liver (L) and spleen (S) were done at Screening (SCR), C3D1, C6D1, 12-Month F/U, 24-Month F/U and 36-Month F/U. The result of the physical examination of the liver (L) and spleen (S) was presented as normal (NOR), enlarged (EL) and not assessed (NOA).

Safety Population. Only those participants with data available at the specified time points were analyzed (represented by n=X, X in the category titles).

Cytogenetics refers to the study of numerical and structural chromosomal abnormalities. Cytogenetics (analyzed by fluorescent in situ hybridization [FISH]) of 17p deletion, 11q deletion, 17p or 11q deletions, 6q- or +12q or 13q- deletions, and no aberration at Baseline were summarized by clinical responses after the last dose of study treatment. Clinical responses included complete remission (CR), nodular partial remission (nPR), complete response with incomplete bone marrow Recovery (CRi), partial remission (PR), disease progression (PD), and stable disease (SD). The participants with a PR, CRi, PR or nPR are called responders and the participants with SD and PD are called non-responders.

ATS Population. Only those participants with data available at the specified time points were analyzed (represented by n=X, X in the category titles).

Participants with B2M concentration of <=4000 µg/L and >4000 µg/L at Baseline and who had clinical response after the last dose of study treatment were provided. Clinical responses included complete remission (CR), complete response with incomplete bone marrow Recovery (CRi), nodular partial remission (nPR), and partial remission (PR), disease progression (PD), and stable disease (SD). The participants with a PR, CRi, PR or nPR are called responders and the participants with SD and PD are called non-responders.

ATS Population. Only those participants with data available at the specified time points were analyzed (represented by n=X, X in the category titles).

Participants with IgVH mutation results as mutated and unmutated status and clinical response after last dose of study treatment were provided. Clinical responses included complete remission (CR), complete response with incomplete bone marrow recovery (CRi), nodular partial remission (nPR), partial remission (PR), disease progression (PD), and stable disease (SD). The participants with a PR, CRi, PR or nPR are called responders and the participants with SD and PD are called non-responders.

ATS Population. Only those participants with data available at the specified time points were analyzed (represented by n=X, X in the category titles).

ZAP-70 is a protein normally expressed near the surface membrane of T cells and natural killer cells. ZAP-70 in B cells is used as a prognostic marker in identifying different forms of CLL. Participants with ZAP-70 testing results intermediate (Int), positive (Pos) and negative (Neg) at Baseline and who had a clinical response after last dose of study treatment are provided. Clinical responses included complete remission (CR), complete response with incomplete bone marrow recovery (CRi), nodular partial remission (nPR), partial remission (PR), disease progression (PD), and stable disease (SD). The participants with a PR, CRi, PR or nPR are called responders and the participants with SD and PD are called non-responders.

ATS Population. Only those participants with data available at the specified time points were analyzed (represented by n=X, X in the category titles).

An Infusion reaction is defined as events occurring after the beginning of an infusion of ofatumumab or within 24 hours following the end of an infusion of bendamustine.

Safety Population: All subjects who receive at least one dose of study medication.