In this week's episode, we’ll learn more about the interaction between anti-PF4 antibodies and anticoagulants in vaccine-induced thrombotic thrombocytopenia, discuss the efficacy and safety of CD19-specific CAR T-cell-based therapy in B-cell ALL patients with central nervous system leukemia, and learn more about erythroid cell-extrinsic factors that can inhibit erythropoiesis in adjacent cells.