CD19 and neoplasm: BiKE connects a single-chain variable fragment (scFv) to the anti-CD16 recognition site with the scFv of a tumor specific antigen, such as CD19/CD20 for non-Hodgkin lymphomas, CD33/CD123 for acute myelogenous leukemia/AML and CD30 for Hodgkin lymphoma, to enhance NK cell recognition of tumor cells [246].