Phase II Study of Ofatumumab Plus Ifosfamide, Carboplatin, Etoposide (ICE) or Dexamethasone, Cytarabine, Cisplatin (DHAP) Chemotherapy Regimen in Relapsed/ Refractory Diffuse Large B Cell Lymphoma (DLBCL)

Responders with OR included participants with complete response (CR) and partial response (PR). This was based on adequate responses from the investigator assessment after the completion of treatment. CR: complete disappearance of all detectable clinical evidence of disease and disease-related symptoms. PR: at least a 50% decrease from baseline in the sum of the product of the diameters of target lesions.

CR is defined as the complete disappearance of all detectable clinical evidence of disease and disease-related symptoms.

CD34+ cells are a mixture of stem cells and white blood cells of various degrees of maturity. Stem cell mobilization is the process of stimulating the hematopoietic stem cells (CD34+) to move out of the bone marrow and into the bloodstream, where they can be collected via a process called apheresis. Successful mobilization was defined as the collection of >2x10^6 CD34+ cells/kg. Only those participants, who commenced mobilization, following the administration of ofatumumab in combination with either ICE or DHAP combination chemotherapy, were assessed.

PFS is defined as the interval of time between the date of treatment start and the earlier of the date of disease progression and the date of death due to any cause. Disease progression was based on the assessments locally by investigators for the disease under study. Disease progression was based on imaging data or clinical assessment data (if radiologic assessment data were not possible or assessment was not performed).

Overall survival is defined as the interval of time between the date of treatment start 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.

AUC is defined as the area under the ofatumumab (Ofa) concentration-time curve as a measure of drug exposure. AUC(0-inf) is AUC from the start of infusion extrapolated to infinite time. Results are reported by first dose group and combined, as appropriate.

AUC(0-tau) is the area under the plasma concentration-time curve from time zero (0) over the dosing interval, tau, and is a measure of drug exposure. Tau is 21 days (504 hours) in this study.

CL is the clearance of drug from plasma, which is defined as the volume of plasma from which drug is removed per unit time.

Cmax is defined as the maximum concentration of drug in plasma samples for the dosing occasion.

Ctrough is defined as the trough plasma concentration, which is the measured concentration at the end of a dosing interval (taken directly before the start of the next infusion).

t1/2 is defined as terminal phase half-life, which is the time required for the amount of the drug in the body to decrease by half.

Vss is the apparent volume of distribution when plasma concentrations are measured under steady state conditions. At steady state, the plasma concentration-time profile of the drug is similar after each dose.

Human anti-human antibodies (HAHA) indicate immune response to the administered human monoclonal antibody in a two-step assay. A positive screening result is confirmed in a second step. Negative Conclusive is subset of Negative and is a negative HAHA test result with an ofatumumab concentration <200 µg/mL in a pharmacokinetic sample collected at the same time as the HAHA sample. Data are presented when a HAHA sample was collected. WD, withdrawal; FU, follow up.

Neutropenia is defined as an abnormal decrease in the number of neutrophils (type of white blood cell in blood) in the blood. Febrile neutropenia is the development of fever in participants with neutropenia. Pancytopenia is defined as inadequate blood-cell formation by bone marrow, resulting in a lack of all blood-cell types.

Anaemia is defined as a pathological deficiency in the oxygen-carrying component of the blood, measured in unit volume concentrations of hemoglobin, red blood-cell volume, or red blood-cell number. Pancytopenia is defined as inadequate blood-cell formation by bone marrow, resulting in a lack of all blood-cell types.

Thrombocytopenia is defined as an abnormal decrease in the number of platelets in circulatory blood. Pancytopenia is defined as inadequate blood-cell formation by bone marrow, resulting in a lack of all blood-cell types.