A Study of Obinutuzumab, Polatuzumab Vedotin, and Lenalidomide in Relapsed or Refractory Follicular Lymphoma (FL) and Rituximab in Combination With Polatuzumab Vedotin and Lenalidomide in Relapsed or Refractory Diffuse Large B-Cell Lymphoma (DLBCL)

Study Overview
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Brief Summary
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This study will evaluate the safety, efficacy, and pharmacokinetics of induction treatment with obinutuzumab, polatuzumab vedotin, and lenalidomide in participants with relapsed or refractory (R/R) follicular lymphoma (FL) and rituximab in combination with polatuzumab vedotin and lenalidomide in participants with R/R diffuse large B-cell lymphoma (DLBCL), followed by post-induction treatment with obinutuzumab in combination with lenalidomide in participants with FL who achieve a complete response (CR), partial response (PR), or stable disease (SD) at end of induction (EOI) and post-induction treatment with rituximab plus lenalidomide in participants with DLBCL who achieve a CR or PR at EOI.

Official Title
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A Phase Ib/II Study Evaluating the Safety and Efficacy of Obinutuzumab in Combination With Polatuzumab Vedotin and Lenalidomide in Patients With Relapsed or Refractory Follicular Lymphoma and Rituximab in Combination With Polatuzumab Vedotin and Lenalidomide in Patients With Relapsed or Refractory Diffuse Large B-Cell Lymphoma

Conditions
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Relapsed or Refractory Follicular Lymphoma, Relapsed or Refractory Diffuse Large B-Cell Lymphoma

Intervention / Treatment
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* Drug: Lenalidomide
* Drug: Obinutuzumab
* Drug: Polatuzumab Vedotin
* Drug: Rituximab


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age greater than or equal to (>/=) 18 years Eastern Cooperative Oncology Group (ECOG) performance status of 0, 1, or 2 For obinutuzumab in combination with polatuzumab vedotin and lenalidomide (G + Pola + Len) treatment group: R/R FL after treatment with at least one prior chemoimmunotherapy regimen that included an anti-CD20 monoclonal antibody and for which no other more appropriate treatment option exists as determined by the investigator For rituximab in combination with polatuzumab vedotin and lenalidomide (R + Pola + Len) treatment group: R/R DLBCL after treatment with at least one prior chemoimmunotherapy regimen that included an anti-CD20 monoclonal antibody in patients who are not eligible for autologous stem-cell transplantation or who have experienced disease progression following treatment with high-dose chemotherapy plus autologous stem-cell transplantation Histologically documented CD20-positive B-cell lymphoma as determined by the local laboratory fluorodeoxyglucose (FDG)-avid lymphoma (i.e., positron emission tomography (PET)-positive lymphoma) At least one bi-dimensionally measurable lesion Agreement to remain abstinent or use adequate contraception, among women or men of childbearing potential Exclusion Criteria: Grade 3b follicular lymphoma History of transformation of indolent disease to diffuse large B-cell lymphoma (DLBCL) Known CD20-negative status at relapse or progression Central nervous system (CNS) lymphoma or leptomeningeal infiltration Prior allogeneic stem-cell transplantation (SCT), or autologous SCT within 100 days prior to Day 1 of Cycle 1 Current use of systemic immunosuppressant(s), or prior anti-cancer therapy to include: lenalidomide, fludarabine, or alemtuzumab within 12 months; radioimmunoconjugate within 12 weeks; mAb or antibody-drug conjugate within 4 weeks; or radiotherapy/chemotherapy/hormone therapy/targeted small-molecule therapy within 2 weeks prior to Day 1 of Cycle 1 Active infection Positive for human immunodeficiency virus (HIV) or hepatitis B or C Receipt of a live virus vaccine within 28 days prior to Day 1 of Cycle 1 Poor hematologic, renal, or hepatic function Pregnant or lactating women Life expectancy less than (<) 3 months

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: Dose-escalation Cohort: FL<br>Participants with R/R FL will receive 6 months of induction treatment with polatuzumab vedotin and lenalidomide at escalating doses to identify the recommended Phase 2 dose (RP2D) for polatuzumab vedotin and lenalidomide when combined with a fixed dose of obinutuzumab. Those who achieve CR, PR, or SD at the EOI (6-8 weeks after Day 1 of Cycle 6) will be eligible to receive a 24-month maintenance regimen consisting of lenalidomide and obinutuzumab, to be initiated 8 weeks after Day 1 of Cycle 6 (induction cycle). | Drug: Lenalidomide<br>* All participants will receive lenalidomide oral capsules at doses of 10, 15, or 20 milligrams (mg) on Days 1 to 21 of each 28-day cycle for up to 6 Cycles in dose escalation phase followed by post-induction treatment at a dose of 10 mg once daily on Days 1 to 21 of each subsequent 28-day cycle. Post-induction lenalidomide may continue for up to 12 months until disease progression or unacceptable toxicity for participants with R/R FL and up to 6 months until disease progression or unacceptable toxicity for participants with R/R DLBCL.<br>Drug: Obinutuzumab<br>* Participants will receive a fixed dose of obinutuzumab, 1000 mg via intravenous (IV) infusion to be given on Days 1, 8 and 15 of Cycle 1 and on Day 1 of Cycles 2 to 6 followed by post-induction treatment at a dose of 1000 mg via IV infusion on Day 1 of every other month for up to 24 months until disease progression or unacceptable toxicity.<br>Drug: Polatuzumab Vedotin<br>* Participants with R/R FL will receive polatuzumab vedotin via IV infusion at doses of 1.4 or 1.8 milligrams per kilogram (mg/kg) on Day 1 of each 28-day cycle for up to 6 months during induction treatment. Participants wit R/R DLBCL will receive polatuzumab vedotin via IV infusion at dose 1.8 mg/kg on Day 1 of each 28-day cycle for up to 6 months during induction treatment.<br>|
| Experimental: Dose-escalation Cohort: DLBCL<br>Participants with R/R DLBCL will receive 6 months of induction treatment with fixed dose of polatuzumab vedotin and rituximab along with dose escalating lenalidomide. Lenalidomide will be administered at escalating doses to identify the recommended Phase 2 dose (RP2D) for lenalidomide. Those who achieve CR and PR at the EOI (6-8 weeks after Day 1 of Cycle 6) will be eligible to receive a 6-month consolidation regimen consisting of lenalidomide and rituximab, to be initiated 8 weeks after Day 1 of Cycle 6 (induction cycle). | Drug: Lenalidomide<br>* All participants will receive lenalidomide oral capsules at doses of 10, 15, or 20 milligrams (mg) on Days 1 to 21 of each 28-day cycle for up to 6 Cycles in dose escalation phase followed by post-induction treatment at a dose of 10 mg once daily on Days 1 to 21 of each subsequent 28-day cycle. Post-induction lenalidomide may continue for up to 12 months until disease progression or unacceptable toxicity for participants with R/R FL and up to 6 months until disease progression or unacceptable toxicity for participants with R/R DLBCL.<br>Drug: Polatuzumab Vedotin<br>* Participants with R/R FL will receive polatuzumab vedotin via IV infusion at doses of 1.4 or 1.8 milligrams per kilogram (mg/kg) on Day 1 of each 28-day cycle for up to 6 months during induction treatment. Participants wit R/R DLBCL will receive polatuzumab vedotin via IV infusion at dose 1.8 mg/kg on Day 1 of each 28-day cycle for up to 6 months during induction treatment.<br>Drug: Rituximab<br>* Participants will receive a fixed dose of rituximab, 375 mg/m^2 via intravenous (IV) infusion to be given on Days 1 of Cycle 1 to 6 followed by post-induction treatment at a dose of 375 mg/m^2 via IV infusion on Day 1 of every other month for up to 6 months, until disease progression or unacceptable toxicity.<br>|
| Experimental: Expansion Cohort: FL<br>Participants with R/R FL who received induction treatment with polatuzumab vedotin and lenalidomide, in addition to obinutuzumab and achieved CR, PR, or SD at the EOI (6-8 weeks after Day 1 of Cycle 6) will receive a 24-months maintenance regimen consisting of lenalidomide and obinutuzumab for first 12 months followed by obinutuzumab treatment for next 12 months. Post-induction therapy will start 8 weeks after Cycle 6 Day 1. | Drug: Lenalidomide<br>* All participants will receive lenalidomide oral capsules at doses of 10, 15, or 20 milligrams (mg) on Days 1 to 21 of each 28-day cycle for up to 6 Cycles in dose escalation phase followed by post-induction treatment at a dose of 10 mg once daily on Days 1 to 21 of each subsequent 28-day cycle. Post-induction lenalidomide may continue for up to 12 months until disease progression or unacceptable toxicity for participants with R/R FL and up to 6 months until disease progression or unacceptable toxicity for participants with R/R DLBCL.<br>Drug: Obinutuzumab<br>* Participants will receive a fixed dose of obinutuzumab, 1000 mg via intravenous (IV) infusion to be given on Days 1, 8 and 15 of Cycle 1 and on Day 1 of Cycles 2 to 6 followed by post-induction treatment at a dose of 1000 mg via IV infusion on Day 1 of every other month for up to 24 months until disease progression or unacceptable toxicity.<br>|
| Experimental: Expansion Cohort: DLBCL<br>Participants with R/R DLBCL who received induction treatment with polatuzumab vedotin and lenalidomide in addition to rituximab and achieved CR or PR at the EOI (6-8 weeks after Day 1 of Cycle 6) will receive a 6-month consolidation regimen consisting of lenalidomide and rituximab. Post-induction therapy will start 8 weeks after Cycle 6 Day 1. | Drug: Lenalidomide<br>* All participants will receive lenalidomide oral capsules at doses of 10, 15, or 20 milligrams (mg) on Days 1 to 21 of each 28-day cycle for up to 6 Cycles in dose escalation phase followed by post-induction treatment at a dose of 10 mg once daily on Days 1 to 21 of each subsequent 28-day cycle. Post-induction lenalidomide may continue for up to 12 months until disease progression or unacceptable toxicity for participants with R/R FL and up to 6 months until disease progression or unacceptable toxicity for participants with R/R DLBCL.<br>Drug: Rituximab<br>* Participants will receive a fixed dose of rituximab, 375 mg/m^2 via intravenous (IV) infusion to be given on Days 1 of Cycle 1 to 6 followed by post-induction treatment at a dose of 375 mg/m^2 via IV infusion on Day 1 of every other month for up to 6 months, until disease progression or unacceptable toxicity.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of Participants With Dose-Limiting Toxicities (DLTs) | A DLT was defined as any one of the following toxicities occurring during the first cycle of treatment and assessed by the investigator as related to study treatment: Any adverse event of any grade that lead to a delay of > 14 days in the start of the next treatment cycle, Grade 3 or 4 non-hematologic adverse events with few exceptions; increase in hepatic transaminase > 3 x baseline and an increase in direct bilirubin > 2 x upper limits of normal (ULN), without any findings of cholestasis or jaundice, or signs of hepatic dysfunction, and in the absence of other contributory factors; hematologic adverse events that met a few protocol specified criteria. DLTs were assessed according to the National Cancer Institute Common Terminology Criteria for Adverse Events, Version 4.0 (NCI CTCAE v4.0). Percentages have been rounded off to the first decimal point. | Day 1 of Cycle 1 to Day 1 of Cycle 2 (1 cycle = 28 days) in dose-escalation phase | 
| Percentage of Participants With Adverse Events (AEs) | An AE 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 AE 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. Percentages have been rounded off to the first decimal point. | From study start up to end of study (Up to a maximum of 69 months) | 
| Percentage of Participants With Complete Response (CR) at End of Induction (EOI), Determined by an Independent Review Committee (IRC) on the Basis of Positron Emission Tomography (PET) and Computed Tomography (CT) Scans | CR at EOI was assessed by IRC according to Modified Lugano Response Criteria (MLRC). Per MLRC, CR based on PET-CT was defined as complete metabolic response (MR) in lymph nodes and extralymphatic sites (ELS) with a score of 1, 2, or 3 with or without residual mass, on 5-point scale (5PS) where 1=no uptake above background; 2=uptake ≤ mediastinum; 3=uptake > mediastinum but ≤ liver; 4=uptake moderately > liver; 5=uptake markedly higher than liver and/or new lesions no evidence of fluorodeoxyglucose (FDG)-avid disease in bone marrow. Bone marrow is normal by morphology; if indeterminate, immunohistochemistry (IHC) negative. Analysis was done 6-8 weeks after Cycle 6, Day 1 (cycle=28 days). Percentages have been rounded off to the first decimal point. | 6 to 8 weeks after Day 1 of Cycle 6 (up to approximately 28 weeks) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Percentage of Participants With CR at EOI, Determined by the Investigator on the Basis of PET-CT Scans | CR at EOI was assessed by Investigator according to MLRC. Per MLRC, CR based on PET-CT was defined as complete MR in lymph nodes and ELS with a score of 1, 2, or 3 with or without residual mass, on 5PS where 1=no uptake above background; 2=uptake ≤ mediastinum; 3=uptake > mediastinum but ≤ liver; 4=uptake moderately > liver; 5=uptake markedly higher than liver and/or new lesions no evidence of FDG-avid disease in bone marrow. Bone marrow is normal by morphology; if indeterminate, IHC negative. Analysis was done 6-8 weeks after Cycle 6, Day 1 (cycle=28 days). Percentages have been rounded off to the first decimal point. | 6 to 8 weeks after Day 1 of Cycle 6 (up to approximately 28 weeks) | 
| Percentage of Participants With CR at EOI, Determined by the IRC on the Basis of CT Scans Alone | CR at EOI was determined by IRC according to the MLRC. Per MLRC, CR based on CT was defined as complete radiologic response in lymph nodes and ELS with target nodes/nodal masses regressing to ≤ 1.5 cm in longest transverse diameter (LDi) and no ELS of disease organ enlargement regressing to normal; no new lesions; normal bone marrow by morphology, if indeterminate, IHC negative. Analysis was done 6-8 weeks after Cycle 6, Day 1 (cycle=28 days). Percentages have been rounded off to the first decimal point. | 6 to 8 weeks after Day 1 of Cycle 6 (up to approximately 28 weeks) | 
| Percentage of Participants With CR at EOI, Determined by Investigator on the Basis of CT Scans Alone | CR at EOI was determined by Investigator according to the MLRC. Per MLRC, CR based on CT was defined as complete radiologic response in lymph nodes and ELS with target nodes/nodal masses regressing to ≤ 1.5 cm in LDi and no ELS of disease organ enlargement regressing to normal; no new lesions; normal bone marrow by morphology, if indeterminate, IHC negative. Analysis was done 6-8 weeks after Cycle 6, Day 1 (cycle=28 days). Percentages have been rounded off to the first decimal point. | 6 to 8 weeks after Day 1 of Cycle 6 (up to approximately 28 weeks) | 
| Percentage of Participants With Objective Response (OR) at EOI, Determined by the IRC on the Basis of PET-CT Scans | OR was defined as percentage of participants with CR or PR as assessed by the IRC according to MLRC. Per MLRC CR based on PET-CT is complete MR in lymph nodes & ELS with score of 1, 2, or 3 with or without residual mass on 5PS, where 1=no uptake above background; 2=uptake ≤ mediastinum; 3=uptake> mediastinum but ≤ liver; 4=uptake moderately > liver; 5=uptake markedly higher than liver and/or new lesions;no new lesions & no evidence of FDG-avid disease in bone marrow.Bone marrow is normal by morphology; if indeterminate, IHC negative. Partial response (PR) based on PET-CT was defined as partial MR in lymph nodes & ELS with score of 4 or 5 with reduced uptake compared with baseline & residual masses of any size at interim, residual uptake higher than uptake in normal bone marrow but reduced compared with baseline (diffuse uptake compatible with reactive changes from chemotherapy allowed). Percentages have been rounded off up to the second decimal point. | 6 to 8 weeks after Day 1 of Cycle 6 (cycle=28 days) (up to approximately 28 weeks) | 
| Percentage of Participants With Objective Response at EOI, Determined by Investigator on the Basis of PET-CT Scans | OR was defined percentage of participants with CR or PR assessed by the investigator according to MLRC. Per MLRC CR based on PET-CT is complete MR in lymph nodes & ELS with score of 1, 2, 3 with or without residual mass on 5PS, where 1=no uptake above background 2=uptake ≤ mediastinum 3=uptake> mediastinum but ≤ liver 4=uptake moderately > liver 5=uptake markedly higher than liver and/or new lesions;no new lesions & no evidence of FDG-avid disease in bone marrow.Bone marrow is normal by morphology; if indeterminate, IHC negative. PR based on PET-CT was defined as partial MR in lymph nodes & ELS with score of 4 or 5 with reduced uptake compared with baseline & residual masses of any size at interim, residual uptake higher than uptake in normal bone marrow but reduced compared with baseline(diffuse uptake compatible with reactive changes from chemotherapy allowed). Percentages are rounded off. | 6 to 8 weeks after Day 1 of Cycle 6 (up to approximately 28 weeks) | 
| Percentage of Participants With Objective Response at EOI, Determined by the IRC on the Basis of CT Scans Alone | OR was defined as the percentage of participants with CR or PR, as assessed by the IRC based on MLRC. Per MLRC, CR based on CT was defined as complete radiologic response in lymph nodes and ELS with target nodes/nodal masses regressing to ≤ 1.5 cm in LDi and no ELS of disease organ enlargement regressing to normal; no new lesions; bone marrow normal by morphology, if indeterminate, IHC negative. PR per CT only was defined as partial remission in lymph nodes and ELS with ≥50% decrease in the sum of the products of greatest diameters (SPD) of up to 6 target measurable lymph nodes and extranodal sites, absent/normal/regressed but with no increase in non-measured lesions, spleen regressing by ≥50% in length beyond normal it, no new sites of lesions. The analysis was done 6-8 weeks after Cycle 6, Day 1 (each cycle is 28 days). Percentages have been rounded off to the first decimal point. | 6 to 8 weeks after Day 1 of Cycle 6 (up to approximately 28 weeks) | 
| Percentage of Participants With Objective Response, Determined by the Investigator on the Basis of CT Scans Alone | OR was defined as the percentage of participants with CR or PR, as assessed by the investigator based on MLRC. Per MLRC, CR based on CT was defined as complete radiologic response in lymph nodes and ELS with target nodes/nodal masses regressing to ≤ 1.5 cm in LDi and no ELS of disease organ enlargement regressing to normal; no new lesions; bone marrow normal by morphology, if indeterminate, IHC negative. PR per CT only was defined as partial remission in lymph nodes and ELS with ≥50% decrease in the sum of the products of greatest diameters (SPD) of up to 6 target measurable lymph nodes and extranodal sites, absent/normal/regressed but with no increase in non-measured lesions, spleen regressing by ≥50% in length beyond normal it, no new sites of lesions. Analysis was done 6-8 weeks after Cycle 6, Day 1 (cycle=28 days). Percentages have been rounded off to the first decimal point. | 6 to 8 weeks after Day 1 of Cycle 6 (up to approximately 28 weeks) | 
| Percentage of Participants With Best Response of CR or PR, Determined by the Investigator on the Basis of CT Scans Alone | BOR=CR/PR per CT per MLRC. Per MLRC, CR based on CT was defined as a complete radiologic response in lymph nodes and ELS with target nodes/nodal masses regressing to ≤ 1.5 cm in LDi and no ELS of disease organ enlargement regressing to normal; no new lesions; bone marrow normal by morphology, if indeterminate, IHC negative. PR per CT only was defined as partial remission in lymph nodes and ELS with ≥50% decrease in SPD of up to 6 target measurable lymph nodes and extranodal sites, absent/normal/regressed but with no increase in non-measured lesions, spleen regressing by ≥50% in length beyond normal it, no new sites of lesions. Percentages have been rounded off to the first decimal point. | Up to every 6 months until disease progression, unacceptable toxicity or study completion (up to approximately 69 months) | 
| Observed Serum Obinutuzumab Concentration | 1 cycle = 28 days | Day 1 of Cycles 1, 2, 4 & 6: predose & 30 mins postdose; EOI: predose; Day 1 of Maintenance Months 1,7, 13, 19;Day 120 post last dose; one year post last dose; study drug discontinuation; unscheduled visit: predose (up to approximately 69 months) | 
| Observed Serum Rituximab Concentration |  | Day 1 of Cycles 1, 2, 4, 6: predose and 30 mins post-dose (1 cycle = 28 days) (up to approximately 69 months) | 
| Serum Concentration of Polatuzumab Vedotin Analyte: Total Antibody |  | Day 1 of Cycles 1, 2, 4: predose (1 cycle = 28 days), Day 120 post last dose; one year post last dose; study drug discontinuation; unscheduled visit: predose (up to approximately 69 months) | 
| Plasma Concentration of Polatuzumab Vedotin Analyte: Antibody-conjugated MMAE (acMMAE) |  | Day 1 of Cycles 1, 2, 4: predose and 30 mins post-dose; Days 8 and 15 of Cycle 1; Day 1 of Cycle 6: predose, study drug discontinuation; unscheduled visit: predose (1 cycle = 28 days) (up to approximately 69 months) | 
| Plasma Concentration of Polatuzumab Vedotin Analyte: Unconjugated MMAE |  | Day 1 of Cycles 1, 2, 4: predose and 30 mins post-dose; Days 8 and 15 of Cycle 1 and Day 1 of Cycle 6: predose, study drug discontinuation; unscheduled visit: predose (1 cycle = 28 days) (up to approximately 69 months) | 
| Observed Plasma Lenalidomide Concentration |  | Day 1 Cycle 1: predose and 2 hours (hr) post-dose; Day 15 Cycle 1: predose, 0.5hr, 1hr, 2hr, 4hr, 8hr post-dose; Day 1 Cycle 6: 2hr post-dose; unscheduled visits: 2hr post-dose (1 cycle = 28 days) (up to approximately 69 months) | 
| Number of Participants With Human Anti-human Antibodies (HAHAs) to Obinutuzumab | The number of participants with positive results for HAHAs, also called anti-drug antibodies (ADAs) against obinutuzumab at baseline and at any of the post-baseline assessment time-points were reported. Number of participants positive for Treatment Emergent ADA = the number of post-baseline evaluable participants determined to have treatment induced ADA or treatment-enhanced ADA during the study period. Treatment-induced ADA = negative or missing baseline ADA result(s) and at least one positive post-baseline ADA result. Treatment-enhanced ADA = a participant with positive ADA result at baseline who has one or more post-baseline titer results that are at least 0.60 titer unit (t.u.) greater than the baseline titer result. | Baseline up to approximately 2 years after last dose (up to approximately 69 months) | 
| Number of Participants With Human Anti-chimeric Antibodies (HACAs) to Rituximab | The number of participants with positive results for HACAs, also called ADAs against rituximab at baseline and at any of the post-baseline assessment time-points were reported. Number of participants positive for Treatment Emergent ADA = the number of post-baseline evaluable participants determined to have treatment induced ADA or treatment-enhanced ADA during the study period. Treatment-induced ADA = negative or missing baseline ADA result(s) and at least one positive post-baseline ADA result. Treatment-enhanced ADA = a participant with positive ADA result at baseline who has one or more post-baseline titer results that are at least 0.60 t.u. greater than the baseline titer result. | Baseline up to approximately 2 years after last dose (up to approximately 69 months) | 
| Number of Participants With Anti-therapeutic Antibodies (ATAs) to Polatuzumab Vedotin | The number of participants with positive results for ATAs, also called ADAs against polatuzumab vedotin at baseline and at any of the post-baseline assessment time-points were reported. Number of participants positive for Treatment Emergent ADA = the number of post-baseline evaluable participants determined to have treatment induced ADA or treatment-enhanced ADA during the study period. Treatment-induced ADA = negative or missing baseline ADA result(s) and at least one positive post-baseline ADA result. Treatment-enhanced ADA = a participant with positive ADA result at baseline who has one or more post-baseline titer results that are at least 0.60 t.u. greater than the baseline titer result. | Baseline up to approx. 2 years after the last dose of polatuzumab vedotin (up to approximately 30 months) |