RecruitingPhase 2Drug trialEvaluate the Safety and Efficacy of Tafasitamab Combined With Lenalidomide in Patients With Relapsed or Refractory DLBCLThis is a A Phase II, Single-Arm, Open-Label, Multicentre Study to Evaluate the Safety and Efficacy of Tafasitamab Combined with Lenalidomide in Patients with Relapsed or Refractory Diffuse Large B-Cell Lymphoma