GZMB and acute lymphoblastic leukemia: The different response of OVA-specific T cells between IFN and control mice might be due to increased homing to the leukemia-infiltrated organs, more effective co-stimulation in the context of a pro-inflammatory microenvironment21, increased expression and regulation of genes involved in CTL function (i.e., granzyme B, IFNg, Tbet, Eomes)22, lower suppression from tumor and other infiltrating cells, and more favorable effector to target ratio because of IFN-mediated ALL growth inhibition.