A Study of Atezolizumab in Combination With Either Obinutuzumab Plus Bendamustine or Obinutuzumab Plus (+) Cyclophosphamide, Doxorubicin, Vincristine, and Prednisone (CHOP) in Participants With Follicular Lymphoma (FL) or Rituximab + CHOP in Participants With Diffuse Large B-Cell Lymphoma (DLBCL)

Study Overview
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Brief Summary
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This Phase Ib/II, open-label, multicenter, non-randomized study will evaluate the safety, efficacy, and pharmacokinetics of induction treatment consisting of atezolizumab in combination with either obinutuzumab + bendamustine (Atezo-G-benda) or obinutuzumab + CHOP (Atezo-G-CHOP) in participants with FL and atezolizumab + rituximab + chemotherapy (Atezo-R-CHOP) in participants with DLBCL, followed by post-induction treatment consisting of either atezolizumab plus obinutuzumab (Atezo-G) in participants with FL who achieve a complete response (CR) or partial response (PR) at end of induction (EOI) or atezolizumab alone in participants with DLBCL who achieve a CR at EOI.

Official Title
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A Phase IB/II Study Evaluating the Safety and Efficacy of Atezolizumab in Combination With Either Obinutuzumab Plus Bendamustine or Obinutuzumab Plus CHOP in Patients With Follicular Lymphoma or Rituximab Plus CHOP in Patients With Diffuse Large B-Cell Lymphoma

Conditions
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Diffuse Large B-Cell Lymphoma, Lymphoma Follicular

Intervention / Treatment
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* Drug: Atezolizumab
* Drug: Bendamustine
* Drug: Cyclophosphamide
* Drug: Doxorubicin
* Drug: Obinutuzumab
* Drug: Prednisone
* Drug: Vincristine
* Drug: Rituximab


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Eastern Cooperative Oncology Group (ECOG) Performance Status of 0, 1, or 2 For participants enrolled in the safety run-in phase: lymphoma classified as either relapsed or refractory FL after treatment with at least one prior chemoimmunotherapy regimen or previously untreated Grade 1, 2, or 3a FL that requires treatment For participants enrolled in the expansion phase: lymphoma classified as either previously untreated Grade 1, 2, or 3a FL that requires treatment or previously untreated advanced DLBCL Histologically documented cluster of differentiation 20 (CD20) positive lymphoma Fluorodeoxyglucose-avid lymphoma At least one bi-dimensionally measurable lesion (greater than [>] 1.5 centimeters in its largest dimension by CT scan or magnetic resonance imaging) Availability of a representative tumor specimen and the corresponding pathology report for retrospective central confirmation of the diagnosis of FL or DLBCL For women who are not postmenopausal or surgically sterile: agreement to remain abstinent (refrain from heterosexual intercourse) or use contraceptive methods that result in a failure rate of less than [<] 1 percent [%] per year during the treatment period and for at least 18 months after the last dose of study treatment for participants in the Atezo-G-benda and Atezo-G-CHOP treatment groups or for at least 12 months after the last dose of study treatment for participants in the Atezo-R-CHOP treatment group For men: agreement to remain abstinent or use contraceptive measures and agreement to refrain from donating sperm Exclusion Criteria: Histological evidence of transformation of FL into high-grade B-cell non-Hodgkin's lymphoma (NHL) Central nervous system lymphoma or leptomeningeal infiltration For participants with DLBCL: preplanned consolidative radiotherapy Treatment with systemic immunosuppressive medications, including, but not limited to, prednisone, azathioprine, methotrexate, thalidomide, and anti-tumor necrosis factor agents within 2 weeks prior to Day 1 of Cycle 1 For participants with relapsed or refractory FL: prior allogeneic or autologous stem cell transplantation, anthracycline therapy, treatment with fludarabine or alemtuzumab within 12 months prior to Day 1 of Cycle 1, treatment with a monoclonal antibody, radioimmunoconjugate, or antibody-drug conjugate within 4 weeks prior to Day 1 of Cycle 1, radiotherapy, chemotherapy, hormonal therapy, or targeted small-molecule therapy within 2 weeks prior to Day 1 of Cycle 1 History of solid organ transplantation History of severe allergic or anaphylactic reaction or known sensitivity to humanized or murine monoclonal antibodies Known hypersensitivity to biopharmaceuticals produced in Chinese hamster ovary cells or any component of the atezolizumab, obinutuzumab, rituximab, or bendamustine formulation, including mannitol Positive for hepatitis B surface antigen (HBsAg), total hepatitis B core antibody (HBcAb), or hepatitis C virus (HCV) antibody at screening History of progressive multifocal leukoencephalopathy Vaccination with a live virus vaccine within 28 days prior to Day 1 of Cycle 1 History of other malignancy, autoimmune disease, or any significant, uncontrolled concomitant disease that could affect compliance with the protocol or interpretation of results Major surgical procedure other than for diagnosis within 28 days prior to Day 1 of Cycle 1, or anticipation of a major surgical procedure during the course of the study For participants who will be receiving CHOP: left ventricular ejection fraction (LVEF) <50% by multiple-gated acquisition (MUGA) scan or echocardiogram Inadequate hematologic, renal, and liver function (unless due to underlying lymphoma)

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Atezo-G-Benda (Safety Run-In and Expansion Phases)<br>Safety run-in phase: Participants with previously untreated or relapsed or refractory FL will receive obinutuzumab (G) and bendamustine during Cycle 1 (28-day cycle) and atezolizumab, obinutuzumab, and bendamustine during Cycles 2-6, during induction treatment, followed by atezolizumab (once monthly) and obinutuzumab (every other month [q2m]) for 24 months, during maintenance treatment. Expansion phase: Participants with previously untreated FL will receive same treatment regimen as described for safety run-in phase. | Drug: Atezolizumab<br>* Atezo-G-Benda: Atezolizumab 840 milligrams (mg) intravenously (IV) on Days 1 and 15 of Cycles 2-6, during induction treatment, followed by 840 mg IV on Days 1 and 2 of each month, starting with Month 1, during maintenance treatment. Atezo-G-CHOP: Atezolizumab 1200 mg IV on Day 1 Cycles 2-6, during induction treatment, followed by 840 mg IV on Days 1 and 2 of each month, starting with Month 1. Atezo-R-CHOP: Atezolizumab 1200 mg IV on Day 1 Cycles 2-8, during induction treatment, followed by 1200 mg IV on Day 1 of Cycles 9-25.<br>* Other names: RO5541267; Tecentriq;Drug: Bendamustine<br>* Bendamustine will be administered at a dose of 90 milligrams per square meter (mg/m^2) IV on Days 1 and 2 of Cycles 1-6, during induction treatment.<br>Drug: Obinutuzumab<br>* Atezo-G-Benda: Obinutuzumab will be administered at a dose of 1000 mg IV on Days 1, 8, and 15 of Cycle 1 and 1000 mg IV on Day 1 of Cycles 2-6, during induction treatment, followed by 1000 mg IV on Day 1 of every other month, starting with Month 1, during maintenance treatment. Atezo-G-CHOP: Obinutuzumab will be administered at a dose of 1000 mg IV on Days 1, 8, and 15 of Cycle 1 and 1000 mg IV on Day 1 of Cycles 2-6 during induction treatment, followed by 1000 mg IV on Day 1 of every other month, starting with Month 1 during maintenance treatment.<br>* Other names: RO5072759;|
| Experimental: Atezo-G-CHOP (Safety Run-In Phase)<br>Safety run-in phase: Participants with previously untreated or relapsed or refractory FL will receive obinutuzumab and CHOP during Cycle 1 (21-day cycle) and atezolizumab, obinutuzumab, and CHOP during Cycles 2-6, during induction treatment, followed by atezolizumab (once monthly) and obinutuzumab (q2m) for 24 months, during maintenance treatment. | Drug: Atezolizumab<br>* Atezo-G-Benda: Atezolizumab 840 milligrams (mg) intravenously (IV) on Days 1 and 15 of Cycles 2-6, during induction treatment, followed by 840 mg IV on Days 1 and 2 of each month, starting with Month 1, during maintenance treatment. Atezo-G-CHOP: Atezolizumab 1200 mg IV on Day 1 Cycles 2-6, during induction treatment, followed by 840 mg IV on Days 1 and 2 of each month, starting with Month 1. Atezo-R-CHOP: Atezolizumab 1200 mg IV on Day 1 Cycles 2-8, during induction treatment, followed by 1200 mg IV on Day 1 of Cycles 9-25.<br>* Other names: RO5541267; Tecentriq;Drug: Cyclophosphamide<br>* Cyclophosphamide will be administered at a dose of 750 mg/m^2 IV on Day 1 of Cycle 1-6/8, during induction treatment.<br>Drug: Doxorubicin<br>* Doxorubicin will be administered at a dose of 50 mg/m^2 IV on Day 1 of Cycle 1-6/8, during induction treatment.<br>Drug: Obinutuzumab<br>* Atezo-G-Benda: Obinutuzumab will be administered at a dose of 1000 mg IV on Days 1, 8, and 15 of Cycle 1 and 1000 mg IV on Day 1 of Cycles 2-6, during induction treatment, followed by 1000 mg IV on Day 1 of every other month, starting with Month 1, during maintenance treatment. Atezo-G-CHOP: Obinutuzumab will be administered at a dose of 1000 mg IV on Days 1, 8, and 15 of Cycle 1 and 1000 mg IV on Day 1 of Cycles 2-6 during induction treatment, followed by 1000 mg IV on Day 1 of every other month, starting with Month 1 during maintenance treatment.<br>* Other names: RO5072759;Drug: Prednisone<br>* Prednisone will be administered at a dose of 40 mg/m^2 orally on Days 1-5 of Cycle 1-6/8, during induction treatment. Prednisolone may be given if prednisone is unavailable. The 40 mg/m^2 dose of prednisone on Day 1 will be replaced by oral corticosteroids given as premedication on Day 1 of Cycle 1 (and subsequent cycles).<br>Drug: Vincristine<br>* Vincristine will be administered at a dose of 1.4 mg/m^2 (maximum 2 mg) IV on Day 1 of Cycle 1-6/8, during induction treatment.<br>|
| Experimental: Atezo-R-CHOP (Expansion Phase)<br>Participants with previously untreated DLBCL will receive rituximab and CHOP during Cycle 1 (21-day cycle) and atezolizumab, rituximab, and CHOP during Cycles 2-8 (atezolizumab and rituximab for 8 cycles and CHOP for either 6 or 8 cycles, as determined by the investigator), during induction treatment, followed by atezolizumab from Cycles 9-25 during consolidation treatment. | Drug: Atezolizumab<br>* Atezo-G-Benda: Atezolizumab 840 milligrams (mg) intravenously (IV) on Days 1 and 15 of Cycles 2-6, during induction treatment, followed by 840 mg IV on Days 1 and 2 of each month, starting with Month 1, during maintenance treatment. Atezo-G-CHOP: Atezolizumab 1200 mg IV on Day 1 Cycles 2-6, during induction treatment, followed by 840 mg IV on Days 1 and 2 of each month, starting with Month 1. Atezo-R-CHOP: Atezolizumab 1200 mg IV on Day 1 Cycles 2-8, during induction treatment, followed by 1200 mg IV on Day 1 of Cycles 9-25.<br>* Other names: RO5541267; Tecentriq;Drug: Cyclophosphamide<br>* Cyclophosphamide will be administered at a dose of 750 mg/m^2 IV on Day 1 of Cycle 1-6/8, during induction treatment.<br>Drug: Doxorubicin<br>* Doxorubicin will be administered at a dose of 50 mg/m^2 IV on Day 1 of Cycle 1-6/8, during induction treatment.<br>Drug: Prednisone<br>* Prednisone will be administered at a dose of 40 mg/m^2 orally on Days 1-5 of Cycle 1-6/8, during induction treatment. Prednisolone may be given if prednisone is unavailable. The 40 mg/m^2 dose of prednisone on Day 1 will be replaced by oral corticosteroids given as premedication on Day 1 of Cycle 1 (and subsequent cycles).<br>Drug: Vincristine<br>* Vincristine will be administered at a dose of 1.4 mg/m^2 (maximum 2 mg) IV on Day 1 of Cycle 1-6/8, during induction treatment.<br>Drug: Rituximab<br>* Atezo-R-CHOP: Participants with previously untreated DLBCL will receive rituximab at a dose of 375 mg/m^2 IV on Day 1 of Cycle 1-8, during induction treatment.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of Participants With Complete Response (CR) at End of Induction (EOI), as Determined by the Independent Review Committee (IRC) Using Modified Lugano 2014 Criteria | Primary end point was positron emission tomography (PET) CR at EOI by IRC according to modified Lugano classification using PET/CT scan. CR was defined as a score of 1 (no uptake above background), 2 (uptake less than or equal to [</=] mediastinum), or 3 (uptake less than [<] mediastinum but </=liver) with or without a residual mass on PET 5-point scale (5-PS), for lymph nodes and extralymphatic sites; no new lesions; no evidence of fluorodeoxyglucose (FDG)-avid disease in bone marrow; and normal/immunohistochemistry (IHC)-negative bone marrow morphology. All PET evaluable 1L FL and 1L DLBCL participants with at least one dose of atezolizumab were included in efficacy population. | Up to approximately 6 months | 
| Percentage of Participants With Adverse Events | An adverse event is any untoward medical occurrence in a participant administered a pharmaceutical product and which does not necessarily have to have a causal relationship with the treatment. An adverse event can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding, for example), symptom, or disease temporally associated with the use of a pharmaceutical product, whether or not considered related to the pharmaceutical product. Preexisting conditions which worsen during a study are also considered as adverse events. | Baseline up to approximately 4 years | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of Participants With CR at EOI, as Determined by the Investigator Using Lugano 2014 Criteria | Tumor response assessment was performed by the investigator according to modified Lugano classification using PET/CT scan. CR was defined as a score of 1 (no uptake above background), 2 (uptake </=mediastinum), or 3 (uptake <mediastinum but </=liver) with or without a residual mass on PET 5-PS, for lymph nodes and extralymphatic sites; no new lesions; no evidence of FDG-avid disease in bone marrow; and normal/IHC-negative bone marrow morphology. 90% confidence interval (CI) for percentage of responders was calculated using Clopper-Pearson method. All PET evaluable 1L FL and 1L DLBCL patients with at least one dose of atezolizumab were included in efficacy population. | Up to approximately 6 months | 
| Percentage of Participants With CR at EOI, as Determined by the IRC Using Modified Cheson 2007 Criteria | Complete response according to the modified Cheson 2007 criteria using PET/CT scan: complete disappearance of all detectable clinical evidence of disease and disease-related symptoms if present prior to therapy, liver and spleen have returned to normal size (if enlarged at baseline), If the bone marrow was involved by lymphoma prior to treatment, the infiltrate must have cleared on repeat bone marrow biopsy. Partial Response (PR): at least 50% regression of measurable disease compared to tumors measured by a baseline scan and no new sites; no increase in the size of the other nodes, liver, or spleen; with the exception of splenic and hepatic nodules, involvement of other organs is usually assessable and no measurable disease should be present. All PET evaluable 1L FL and 1L DLBCL patients with at least one dose of atezolizumab were included in efficacy population. | Up to approximately 6 months | 
| Percentage of Participants With CR at EOI, as Determined by the Investigator Using Modified Cheson 2007 Criteria | Complete response according to modified Cheson 2007 criteria using PET/CT scan: complete disappearance of all detectable clinical evidence of disease and disease-related symptoms if present prior to therapy, liver and spleen have returned to normal size (if enlarged at baseline), If bone marrow was involved by lymphoma prior to treatment, infiltrate must have cleared on repeat bone marrow biopsy. PR: at least 50% regression of measurable disease compared to tumors measured by a baseline scan and no new sites; no increase in the size of other nodes, liver, or spleen; with exception of splenic and hepatic nodules, involvement of other organs is usually assessable and no measurable disease should be present. All PET evaluable 1L FL and 1L DLBCL patients with at least one dose of atezolizumab were included in efficacy population. Only Atezo-G-Benda and Atezo-R-Chop cohorts were evaluated for efficacy. | Up to approximately 6 months | 
| Percentage of Participants With Objective Response (CR or PR) at EOI, as Determined by the IRC Using Modified Cheson 2007 Criteria | Objective response: having CR or PR as assessed according to the modified response criteria for iNHL (Modified Cheson et al, 2007). CR: Complete disappearance of all detectable clinical evidence of disease and disease-related symptoms if present prior to therapy, liver and spleen have returned to normal size (if enlarged at baseline), If the bone marrow was involved by lymphoma prior to treatment, the infiltrate must have cleared on repeat bone marrow biopsy. PR: at least 50% regression of measurable disease compared to tumors measured by a baseline scan and no new sites; no increase in the size of the other nodes, liver, or spleen; with the exception of splenic and hepatic nodules, involvement of other organs is usually assessable and no measurable disease should be present. All positron emission tomography (PET) evaluable 1L FL and 1L DLBCL patients with at least one dose of atezolizumab were included in efficacy population. | Up to approximately 6 months | 
| Percentage of Participants With Objective Response (CR or PR) at EOI, as Determined by the Investigator Using Modified Cheson 2007 Criteria | Objective response: having CR or PR as assessed according to the modified response criteria for iNHL (Modified Cheson et al, 2007). CR: Complete disappearance of all detectable clinical evidence of disease and disease-related symptoms if present prior to therapy, liver and spleen have returned to normal size (if enlarged at baseline), If the bone marrow was involved by lymphoma prior to treatment, the infiltrate must have cleared on repeat bone marrow biopsy. PR: at least 50% regression of measurable disease compared to tumors measured by a baseline scan and no new sites; no increase in the size of the other nodes, liver, or spleen; with the exception of splenic and hepatic nodules, involvement of other organs is usually assessable and no measurable disease should be present. All positron emission tomography (PET) evaluable 1L FL and 1L DLBCL patients with at least one dose of atezolizumab were included in efficacy population. | Up to approximately 6 months | 
| Percentage of Participants With Objective Response (CR or PR) at EOI, as Determined by the IRC Using Lugano 2014 Criteria | Tumor response assessment was performed by IRC according to modified Lugano classification using PET/CT scan. OR defined as a response of CR or PR. CR: a score of 1 (no uptake above background), 2 (uptake </=mediastinum), or 3 (uptake <mediastinum but </=liver) with/without a residual mass on PET 5-PS, for lymph nodes and extralymphatic sites; no new lesions; no evidence of FDG-avid disease in bone marrow; and normal/IHC-negative bone marrow morphology. PR: a score 4 (uptake moderately greater than [>] liver) or 5 (uptake markedly >liver and/or new lesions) with reduced uptake compared with baseline and residual mass(es) of any size on PET 5-PS for lymph nodes and extralymphatic sites; no new lesions; and reduced residual uptake in bone marrow compared with baseline. All positron emission tomography (PET) evaluable 1L FL and 1L DLBCL patients with at least one dose of atezolizumab were included in efficacy population. | Up to approximately 6 months | 
| Percentage of Participants With Objective Response (CR or PR) at EOI, as Determined by the Investigator Using Lugano 2014 Criteria | Tumor response assessment was performed by investigator according to modified Lugano classification using PET/CT scan. OR: a response of CR or PR. CR: a score of 1 (no uptake above background), 2 (uptake </=mediastinum), or 3 (uptake <mediastinum but </=liver) with or without a residual mass on PET 5-PS, for lymph nodes & extralymphatic sites; no new lesions; no evidence of FDG-avid disease in bone marrow; and normal/IHC-negative bone marrow morphology. PR with a score 4 (uptake moderately greater than [>] liver) or 5 (uptake markedly >liver and/or new lesions) with reduced uptake compared with baseline and residual mass(es) of any size on PET 5-PS for lymph nodes and extralymphatic sites; no new lesions; and reduced residual uptake in bone marrow compared with baseline. All positron emission tomography (PET) evaluable 1L FL and 1L DLBCL patients with at least one dose of atezolizumab were included in efficacy population. | Up to approximately 6 months | 
| Percentage of Participants With Best Response of CR or PR During Study, as Determined by Investigator Using Modified Cheson 2007 Criteria | CR: Complete disappearance of all detectable clinical evidence of disease and disease-related symptoms if present prior to therapy, liver and spleen have returned to normal size (if enlarged at baseline), If the bone marrow was involved by lymphoma prior to treatment, the infiltrate must have cleared on repeat bone marrow biopsy. PR: at least 50% regression of measurable disease compared to tumors measured by a baseline scan and no new sites; no increase in the size of the other nodes, liver, or spleen; with the exception of splenic and hepatic nodules, involvement of other organs is usually assessable and no measurable disease should be present. Only Atezo-G-Benda and Atezo-R-Chop cohorts were evaluated for efficacy. | Baseline up to approximately 4 years (assessed at Baseline, 6 to 8 weeks after Day [D] 1 of Cycle [Cy] 6 or 8 (1Cy: 21 or 28 days), then every 2 months up to 24 months, at 35 days of last dose, and at every 3 months post-treatment follow-up [up 4 years]) | 
| Observed Serum Obinutuzumab Concentration | Predose time point was any time prior to dose for Cycle (Cy) 1 and within 5 hour prior to dose for other cycles (Cy 2,5,6) and for Months 1 to 24 during maintenance phase. Infusion duration for administration of first infusion should begin at an initial rate of 50 milligrams per hour (mg/hour). If no reaction occurs, increase the infusion rate in 100 mg/hour increments every 30 minutes to a maximum of 400 mg/hour. | Induction: Predose, 0.5 hour (h) postinfusion on Day (D) 1 of Cy1,2,5,6 (1Cy: 21/28 days); Maintenance: Predose, 0.5h postinfusion on Day 1 of Month 1,3,7,15,23; 120 days & 1 year of last dose or at treatment discontinuation (up to 4 years) | 
| Observed Serum Atezolizumab Concentration | Atezo-G-Benda: Induction:Predose on D1 of Cy5,6 & D1,15 of Cy2,3 (1Cy:21/28 days), Cy2D1:0.5h postinfusion; Maintenance:Predose on D1 of Month 1,2,4,7,15,23, Month 2 D1: 0.5h postinfusion; 120 days & 1 year of last dose or at treatment discontinuation (up to 4 years); Atezo-G-CHOP: Induction:Predose on D1 of Cy2,3,5,6 (1Cy:21 days), Cy2D1:0.5h postinfusion; Maintenance:Predose on D1 of Month 1,2,3,4,7,15,23, Month 2 D1: 0.5h postinfusion; 120 days & 1 year of last dose or at treatment discontinuation (up to 4 years). Predose time point was within 5 hour prior to dose for Cy2,3,5,6 during induction phase and for Months 1 to 24 during maintenance phase. infusion length: 30-60 minutes. | Atezo-R-CHOP: Predose on D1 of Cy2,3,5,8,9,10,11,12,16,20,25 (1Cy:21 days), 0.5h postinfusion of D1 of Cy2,9; at 120 days & 1 year of last dose or at treatment discontinuation (up to 4 years) | 
| Observed Serum Rituximab Concentration | Predose time point was any time prior to dose for Cycle 1 and within 5 hour prior to dose for other cycles (Cycles 2,5,8) during induction phase and for Months 1 to 24 during maintenance phase. Infusion duration for administration of first infusion should begin at an initial rate of 50 mg/hour. If no infusion-related or hypersensitivity reaction occurs, increase the infusion rate in 50 mg/hour increments every 30 minutes to a maximum of 400 mg/hour. If no reaction occurs, increase the infusion rate in 100 mg/hour increments every 30 minutes to a maximum of 400 mg/hour. | Predose, 0.5h postinfusion on D1 of Cy1,2,5,8 (1Cy: 21 days); at 120 days and 1 year after last rituximab dose or at treatment discontinuation (up to 4 years) | 
| Percentage of Participants With Human Anti-Human Antibodies (HAHAs) to Obinutuzumab | Induction: Predose (any time prior to dose) on D1 of Cy1,5,6 (1Cy: 21/28 days); Maintenance: Predose (any time prior to dose) on D1 of Month 1; at 120 days and 1 year of last obinutuzumab dose or at treatment discontinuation (up to 4 years) | Baseline up to approximately 4 years | 
| Percentage of Participants With Human Anti-Chimeric Antibodies (HACAs) to Rituximab | Induction: Predose (any time prior to dose) on D1 of Cy1,5,8 (1Cy: 21 days); Maintenance: at 120 days and 1 year of last rituximab dose or at treatment discontinuation (up to 4 years) | Baseline up to approximately 4 years | 
| Percentage of Participants With Anti-Therapeutic Antibodies (ATAs) to Atezolizumab | Atezo-G-CHOP: Induction: Predose on D1 of Cy2,3,5,6 (1 Cy: 21 days); Maintenance: Predose on D1 of Month 1,2,4,7,15,23; at 120 days and 1 year of last atezolizumab dose or at treatment discontinuation (up to 4 years); Atezo-R-CHOP: Predose on D1 of Cy 2,3,5,8,16,25 (1 Cy: 21 days); at 120 days and 1 year of last atezolizumab dose or at treatment discontinuation (up to 4 years). Predose time point was any time prior to dose for Cycles 2,3,5,6,8 during induction phase, for Cycles 16,25 during consolidation treatment, and for Months 1 to 24 during maintenance phase. Atezo-G-Benda: Induction: Predose on D1 of Cy2,3,5,6 (1Cy: 28 days), Cy3D15: Predose; ; Maintenance: Predose on D1 of Month 1,4,7,15,23; at 120 days and 1 year of last atezolizumab dose or at treatment discontinuation (up to 4 years). The percentage of participants with positive results for ATAs to atezolizumab at baseline and at post-baseline time points are reported. | Baseline up to approximately 4 years |