A Study of Pinatuzumab Vedotin (DCDT2980S) Combined With Rituximab or Polatuzumab Vedotin (DCDS4501A) Combined With Rituximab or Obinutuzumab in Participants With Relapsed or Refractory B-Cell Non-Hodgkin's Lymphoma (NHL)

Arms (6)

1. type

   EXPERIMENTAL

   label

   Arm A (FL+DLBCL): RTX+Pinatuzumab,Then RTX+Polatuzumab

   description

   For the first 2 cycles, RTX 375 milligrams per square meter (mg/m\^2) will be given by intravenous (IV) infusion on Day 1 and pinatuzumab vedotin 2.4 milligrams per kilogram (mg/kg) will be administered by IV infusion on Day 2 to Arm A participants (with r/r FL and DLBCL). In the absence of any infusion-related adverse events, RTX and pinatuzumab may be administered on the same day (Day 1) in subsequent cycles beginning with the third cycle. Participants who develop disease progression (PD) will be further treated with RTX 375 mg/m\^2 followed by polatuzumab vedotin 2.4 mg/kg IV infusion on Day 1, beginning no later than 42 days after the last dose of the prior study treatment until a second PD event relative to the tumor assessment, documenting PD on the initial study treatment, clinical deterioration, and/or intolerance to the crossover treatment for up to a maximum of 1 year (17 cycles on an every-21-day schedule).

   interventionNames

   1. Drug: Pinatuzumab Vedotin
   2. Drug: Polatuzumab Vedotin
   3. Drug: Rituximab

2. type

   EXPERIMENTAL

   label

   Arm B (FL+DLBCL): RTX+Polatuzumab,Then RTX+Pinatuzumab

   description

   For the first 2 cycles, RTX 375 mg/m\^2 will be given by IV infusion on Day 1 and polatuzumab vedotin 2.4 mg/kg will be administered by IV infusion on Day 2 to Arm B participants (with r/r FL and DLBCL). In the absence of any infusion-related adverse events, RTX and polatuzumab may be administered on the same day (Day 1) in subsequent cycles beginning with the third cycle. Participants who develop PD would be further treated with RTX 375 mg/m\^2 followed by pinatuzumab vedotin 2.4 mg/kg IV infusion on Day 1, beginning no later than 42 days after the last dose of the prior study treatment until a second PD event relative to the tumor assessment, documenting PD on the initial study treatment, clinical deterioration, and/or intolerance to the crossover treatment for up to a maximum of 1 year (17 cycles on an every-21-day schedule).