Safety Study to Assess AFM11 in Patients With Relapsed and/or Refractory CD19 Positive B-cell NHL

CD19 is present on B-cells from earliest recognizable B-lineage cells during development to B-cell blasts and is lost only upon maturation to plasma cells. Expression of CD19 on B-cells at various development stages makes it an ideal target to treat B-cell associated malignancies.The rationale for the use of AFM11 is based on its ability to bind to both malignant cells via its anti-CD19 domain and to T-cells via its anti-CD3 domains. This results in the formation of the "immunological synapse" and the subsequent T-cell activation on leading to killing of malignant cells.