CXCL9 and acute lymphoblastic leukemia: A strong IFN‐γ response was detected in both CLL and ALL co‐cultures, accompanied by elevated levels of downstream effector—chemokines, including monokine induced by interferon gamma (MIG), interferon gamma‐induced protein 10 (IP‐10), and interferon‐inducible T‐cell alpha chemoattractant (I‐TAC) (Figure 3B).