A Study of Obinutuzumab [RO5072759 (GA101)] in Combination With CHOP Chemotherapy in Patients With Previously Untreated Advanced Diffuse Large B-Cell Lymphoma (GATHER)

Complete response rate is defined as the percentage of participants with Complete Response (CR) according to the Revised Response Criteria for Malignant Lymphoma (Cheson et al., 2007). Disease response was evaluated by the IRF using CT scans, PET scans and pertinent clinical information. CR is the disappearance of all evidence of disease.

Overall response rate was defined as the percentage of participants with Complete Response (CR) or Partial Response (PR) according to the Revised Response Criteria for Malignant Lymphoma (Cheson et al., 2007). Disease response was evaluated by the IRF using CT scans, PET scans and pertinent clinical information. CR is the disappearance of all evidence of disease. PR is at least 50% regression of measurable disease compared to tumors measured by a baseline scan and no new sites.

PFS was defined as the time from the date of the first dose of study treatment until the date of disease progression, relapse, or death from any cause.

DOR is defined as first occurrence of documented response (CR or PR) until the first occurrence of relapse or progression or death of any cause. CR: disappearance of all evidence of disease. PR: at least 50% regression of measurable disease compared to tumors measured by a baseline scan and no new sites.

An adverse event was considered any unfavorable and unintended sign, symptom, or disease associated with the use of the study drug, whether or not considered related to the study drug or other protocol-imposed intervention. Preexisting conditions that worsened during the study were reported as adverse events.

SDI 120 is a shorter duration infusion of 120 minutes and SDI 90 is shorter duration infusion of 90 minutes. Grade 3 IRR AE: Prolonged (e.g., not rapidly responsive to symptomatic medication and/or brief interruption of infusion); recurrence of symptoms following initial improvement; hospitalization indicated for clinical sequelae. Grade 4 IRR AE: Life-threatening consequences; urgent intervention indicated.

Blood was collected for PK Parameters. Serum samples were sent to a central lab and were analyzed for obinutuzumab using a validated enzyme-linked immunosorbent assay (ELISA) measured in micrograms per milliliter (μg/mL).

T1/2 is the time required for the concentration of the drug to reach half of its original value. Blood was collected for PK Parameters. Serum samples were sent to a central lab and were analyzed for obinutuzumab using a validated enzyme-linked immunosorbent assay (ELISA) measured in days

Cl is the volume of serum cleared of the drug per unit of time. Serum samples were sent to a central lab and were analyzed for obinutuzumab using a validated enzyme-linked immunosorbent assay (ELISA) measured in milliliters/day (mL/day).

V is the apparent volume in which a drug is distributed in the body. Serum samples were sent to a central lab and were analyzed for obinutuzumab using a validated enzyme-linked immunosorbent assay (ELISA) measured in milliliters (mL).

Blood was collected for PK parameters. Serum samples were sent to a central lab and were analyzed for obinutuzumab using a validated enzyme-linked immunosorbent assay (ELISA) measured in in day times micrograms per milliliter (day*μg/mL).

B-cell depletion was defined as a CD19 result < 0.07 × 10^9/L after at least one dose of study drug had been administered. Participants were evaluated during a 30-month post-treatment follow-up period following the completion of active study treatment (Cycle 8 [each cycle = 21 days]). Total study duration across active treatment and follow-up was up to approximately 5 years.

B-cell recovery was defined as a CD19 result >= 0.07 × 10^9/L, where CD19 was previously depleted. B-cell recovery was only considered possible following the last dose of study treatment. The number of participants with B-cell recovery from End of Treatment to 6 months of Follow-up is reported in two categories: Recovery with Progressive Disease (PD) [PD before B-cell recovery or PD within 45 days after recovery] or Recovery without PD. PD required one of the following: 50% increase in the absolute number of circulating lymphocytes, Appearance of new palpable lymph nodes, 50% increase in the longest diameter of any previous site of lymphadenopathy, 50% increase in the enlargement of the liver and/or spleen or Transformation to a more aggressive histology.