A Study Evaluating the Safety and Efficacy of Venetoclax (GDC-0199) Plus Bendamustine + Rituximab (BR) in Comparison With BR or Venetoclax Plus Rituximab in Participants With Relapsed and Refractory Follicular Non-Hodgkin's Lymphoma (fNHL)

CMR: a score 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 with no new lesions and no evidence of fluorodeoxyglucose (FDG)-avid disease in bone marrow. Assessment was performed by an IRC according to Lugano classification using PET scan. 95% confidence interval (CI) for percentage of responders was calculated using Clopper-Pearson method.

CMR: a score 1 (no uptake above background), 2 (uptake <=mediastinum), or 3 (<mediastinum but <=liver) with or without a residual mass on PET 5-PS, for lymph nodes and extralymphatic sites with no new lesions and no evidence of FDG-avid disease in bone marrow. Assessment was performed by Investigator according to Lugano classification using PET scan. 95% CI for percentage of responders was calculated using Clopper-Pearson method.

CMR: a score 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 with no new lesions and no evidence of FDG-avid disease in bone marrow. Assessment was performed by an IRC according to Lugano classification using PET scan. 95% CI for percentage of responders was calculated using Clopper-Pearson method.

CMR: a score 1 (no uptake above background), 2 (uptake <=mediastinum), or 3 (<mediastinum but <=liver) with or without a residual mass on PET 5-PS, for lymph nodes and extralymphatic sites with no new lesions and no evidence of FDG-avid disease in bone marrow. Assessment was performed by Investigator according to Lugano classification using PET scan. 95% CI for percentage of responders was calculated using Clopper-Pearson method.

CR: defined as reduction of longest transverse diameter of lesion (LDi) of target nodes/nodal masses to <=1.5 centimeters (cm), and no extralymphatic sites of disease; absence of non-measured lesions and new lesions; reduction of enlarged organs to normal; and normal/immunohistochemistry (IHC)-negative bone marrow morphology. Assessment was performed by an IRC according to Lugano classification using CT scan. 95% CI for percentage of responders was calculated using Clopper-Pearson method.

CR: defined as reduction of LDi of target nodes/nodal masses to <=1.5 cm, and no extralymphatic sites of disease; absence of non-measured lesions and new lesions; reduction of enlarged organs to normal; and normal/IHC-negative bone marrow morphology. Assessment was performed by Investigator according to Lugano classification using CT scan. 95% CI for percentage of responders was calculated using Clopper-Pearson method.

OR was defined as CMR or Partial Metabolic Response (PMR). CMR: a score 1 (no uptake above background), 2 (uptake <=mediastinum), or 3 (<mediastinum but <=liver) with or without a residual mass on PET 5-PS, for lymph nodes and extralymphatic sites with no new lesions and no evidence of FDG-avid disease in bone marrow. PMR: 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 with no new lesions and reduced residual uptake in bone marrow compared with baseline. Assessment was performed by an IRC according to Lugano classification using PET scan. 95% CI for percentage of responders was calculated using Clopper-Pearson method.

OR was defined as CMR or PMR. CMR: a score 1 (no uptake above background), 2 (uptake <=mediastinum), or 3 (<mediastinum but <=liver) with or without a residual mass on PET 5-PS, for lymph nodes and extralymphatic sites with no new lesions and no evidence of FDG-avid disease in bone marrow. PMR: a score 4 (uptake moderately >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 with no new lesions and reduced residual uptake in bone marrow compared with baseline. Assessment was performed by Investigator according to Lugano classification using PET scan. 95% CI for percentage of responders was calculated using Clopper-Pearson method.

OR was defined as CR or Partial Response (PR). CR: reduction of LDi of target nodes/nodal masses to <=1.5 cm, and no extralymphatic sites of disease; absence of non-measured lesions and new lesions; reduction of enlarged organs to normal; and normal/IHC-negative bone marrow morphology. PR: greater than or equal to (>=) 50 percent (%) decrease in sum of the product of the perpendicular diameters (SPD) of up to 6 target measurable nodes and extra-nodal sites; absence/reduction/no increase in size of non-measured lesions; reduction in length of spleen at least >50% beyond normal; and no new lesions. Assessment was performed by an IRC according to Lugano classification using CT scan. 95% CI for percentage of responders was calculated using Clopper-Pearson method.

OR was defined as CR or PR. CR: reduction of LDi of target nodes/nodal masses to <=1.5 cm, and no extralymphatic sites of disease; absence of non-measured lesions and new lesions; reduction of enlarged organs to normal; and normal/IHC-negative bone marrow morphology. PR: >=50% decrease in SPD of up to 6 target measurable nodes and extra-nodal sites; absence/reduction/no increase in size of non-measured lesions; reduction in length of spleen at least >50% beyond normal; and no new lesions. Assessment was performed by Investigator according to Lugano classification using CT scan. 95% CI for percentage of responders was calculated using Clopper-Pearson method.

OR was defined as CMR/CR or PMR/PR. CMR, CR, PMR, and PR have been defined in previous endpoints, and are not repeated here due to space constraint. Assessment was performed by Investigator according to Lugano classification using PET scan or CT scan (if PET is missing).

DOR was defined as time from CMR/CR or PMR/PR until progressive disease (PD) or death due to any cause. CMR, CR, PMR, and PR have been defined in previous endpoints, and are not repeated here due to space constraint. PD: a score 4 (uptake moderately >liver) or 5 (uptake markedly >liver and/or new lesions) with increase in intensity of uptake from baseline on PET 5-PS for individual target nodes/nodal lesions; new FDG-avid foci for extranodal lesions; new FDG-avid foci consistent with lymphoma for new lesions; or new or recurrent FDG-avid foci for bone marrow. Assessment was performed by Investigator according to Lugano classification using PET scan or CT scan (if PET is missing). DOR was calculated using Kaplan-Meier method.

PD: a score 4 (uptake moderately >liver) or 5 (uptake markedly >liver and/or new lesions) with increase in intensity of uptake from baseline on PET 5-PS for individual target nodes/nodal lesions; new FDG-avid foci for extranodal lesions; new FDG-avid foci consistent with lymphoma for new lesions; or new or recurrent FDG-avid foci for bone marrow. Assessment was performed by Investigator according to Lugano classification using PET or CT scan.

PFS was defined as the period from the date of treatment initiation (Safety Run-in and Arm A) or randomization date (Arms B and C) until the date of disease progression, or death due to any cause. PD: a score 4 (uptake moderately >liver) or 5 (uptake markedly >liver and/or new lesions) with increase in intensity of uptake from baseline on PET 5-PS for individual target nodes/nodal lesions; new FDG-avid foci for extranodal lesions; new FDG-avid foci consistent with lymphoma for new lesions; or new or recurrent FDG-avid foci for bone marrow. Assessment was performed by Investigator according to Lugano classification using PET or CT scan. PFS was calculated using Kaplan-Meier method.

PD: a score 4 (uptake moderately >liver) or 5 (uptake markedly >liver and/or new lesions) with increase in intensity of uptake from baseline on PET 5-PS for individual target nodes/nodal lesions; new FDG-avid foci for extranodal lesions; new FDG-avid foci consistent with lymphoma for new lesions; or new or recurrent FDG-avid foci for bone marrow. Assessment was performed by Investigator according to Lugano classification using PET or CT scan.

EFS was defined as the period from the date of treatment initiation (Safety Run-in and Arm A) or randomization date (Arms B and C) to the date of disease progression, death, or start of a new anti-lymphoma therapy whichever occurred first. PD: a score 4 (uptake moderately >liver) or 5 (uptake markedly >liver and/or new lesions) with increase in intensity of uptake from baseline on PET 5-PS for individual target nodes/nodal lesions; new FDG-avid foci for extranodal lesions; new FDG-avid foci consistent with lymphoma for new lesions; or new or recurrent FDG-avid foci for bone marrow. Assessment was performed by Investigator according to Lugano classification using PET or CT scan. EFS was calculated using Kaplan-Meier method.

OS was defined as the period from the date of treatment initiation (Safety Run-in and Arm A) or randomization date (Arms B and C) to death due to any cause. For participants who are alive, OS was censored at the last contact. OS was calculated using Kaplan-Meier method.

CL is a quantitative measure of the rate at which a drug substance is removed from the body.

Vd was defined as the theoretical volume in which the total amount of drug would need to be uniformly distributed to produce the desired plasma concentration of a drug.

Area under the plasma concentration versus time curve from zero to the last measured concentration (AUClast).

Area under the plasma concentration versus time curve from time 0 (pre-dose) to 8 hours post dose (AUC0-8h).