Safety/Efficacy of MEDI-551 in Combination With Immunomodulating Therapies in Subjects With Aggressive B-cell Lymphomas

Participants will receive intravenous (IV) infusion of MEDI-551 12 mg/kg on Days 1 and 8 of Cycle 1 and Day 1 of Cycle 2 through Cycle 13

Participants will receive IV infusion of MEDI0680 2.5 mg/kg on Days 2 and 15 of Cycle 1 and Days 1 and 15 of Cycle 2 through Cycle 13.

Participants will receive IV infusion of MEDI0680 10 mg/kg on Days 2 and 15 of Cycle 1 and Days 1 and 15 of Cycle 2 through Cycle 13.