Efficacy and Safety of Ofatumumab Retreatment and Maintenance Treatment in Patients With B-cell Chronic Lymphocytic Leukemia (CLL)

Par. with complete remission (CR), nodular partial remission (nPR), and partial remission (PR) on 2 consecutive visits >=56 days apart were classified as Rs; those with stable disease (SD)/progressive disease (PD) were classified as NRs. Per the NCIWG 1996 guidelines: CR; no lymphadenopathy/hepatomegaly/splenomegaly/constitutional symptoms, normal hematology, normocellular bone marrow sample for age, <30% lymphocytes (LC), no lymphoid nodule; PR: >=50% decrease in LC/lymphadenopathy; nPR: persistent bone marrow nodules; PD: new lesion or increase by >=50% from baseline; SD: no CR, PR, or PD.

Duration of response is defined as the time from the initial response (first visit at which response is observed) to progression or death. If the participant had progression between scheduled visits, no progression at the end of the trial, treatment discontinuation for undocumented progression, treatment discontinuation for toxicity or other reason, new anti-cancer treatment, and experienced death or progression after two or more missed visits in a row the endpoint was censored.

PFS is defined as the time from randomization until progression (prog.)/death. Prog. events are defined by well-documented and verifiable data; other data are censored. If the par. had prog. between scheduled visits, died before the first assessment, or died between adequate visits, the endpoint was considered progressed. If there was no prog. at the end of the trial, treatment discontinuation for undocumented prog./toxicity/other reason, new anti-cancer treatment, and death/prog. after >=2 missed visits in a row, the endpoint was censored. Clinical prog. is not considered as a prog. endpoint.

Time to next chronic lymphocytic leukemia (CLL) treatment is defined as the time from treatment allocation/randomization (Visit 2) until the time of the first administration of the next CLL treatment other than ofatumumab (or HuMaxCD20, a fully human monoclonal antibody to CD20 that is expressed on the surface of B-cells).

OS is defined as the time from allocation to death.

Reduction in tumor size was measured as the percent change in the sum of the products of the diameters of the largest abnormal lymph nodes from Baseline to Week 24. Percent change was calculated as (Week 24 SPD minus Baseline SPD)/Baseline SPD * 100.

Reduction in tumor size was measured by the percentage change in the sum of products of the diameters of the largest abnormal lymph nodes from Baseline to Month 12. Percent change was calculated as (Month 12 SPD minus Baseline SPD)/Baseline SPD * 100.

Reduction in tumor size was measured by the percentage change in the sum of products of the diameters of the largest abnormal lymph nodes from Baseline to Month 24. Percent change was calculated as (Month 24 SPD minus Baseline SPD)/Baseline SPD * 100.

HAHAs are indicators of immunogenicity to ofatumumab. HAHA levels were assessed for each participant at the end of participation in the study (at their last visit). A positive HAHA status indicates a positive enzyme-linked immunosorbent assay (ELISA) result, an inconclusive status indicates a negative ELISA result at ofatumumab concentration above the threshold at which ofatumumab may interfere with the assay, and a negative status indicates a negative ELISA result at ofatumumab concentration below the threshold.

An adverse event (AE) is defined as any untoward medical occurrence in a participant administered a pharmaceutical product and which did not necessarily have a causal relationship with the treatment. A list of AEs experienced in the study with a frequency threshold of 5% can be found in the AE section of this results record.

The data collected for this analysis are reported in the overall Serious Adverse Events (SAEs) of infections rather than reported separately for this specific analysis. This is a conservative approach for reporting all infectious SAEs in order to ensure that all of the infectious SAEs are represented.

The data collected for this analysis are reported in the overall SAEs of infections rather than reported separately for this specific analysis. This is a conservative approach for reporting all infectious SAEs in order to ensure that all of the infectious SAEs are represented.

Cmax is defined as the maximum concentration of drug in plasma samples (collected at the end of the infusion). Ctrough is defined as the concentration of drug in plasma samples at the end of a dosing interval (collected directly before next administration). Ctrough before the first infusion represents residual ofatumumab from participation in Study Hx-CD20-406.