Immune Checkpoint Inhibitors in Acute Myeloid Leukemia: Novel Combinations and Therapeutic Targets

Abstract

Immune checkpoint therapy has dramatically changed the therapeutic landscape of solid malignancies. Here, we review the scientific rationale and current data evaluating immune checkpoint inhibitors in acute myeloid leukemia (AML). Immune checkpoint inhibitor monotherapy has shown limited clinical activity in AML. Initial results from early-phase clinical trials suggest that rational combinations of immune checkpoint inhibition with hypomethylating agents (HMAs) are safe and potentially more promising. There are currently no data directly comparing immune checkpoint inhibition to standard therapies. Emerging immune targets more specific for leukemia cells including LILRB4 may improve future therapeutic efficacy. The success of immune checkpoint inhibition in AML has been modest to date. However, an improved understanding of the biology and the use of rational combinations has potential to improve rates of durable responses. Multiple clinical trials in AML are currently evaluating the use of immune checkpoints alone and in combination.