- Checkpoint inhibitors block "proteins called checkpoints that are made by some types of immune system cells, such as T cells, and some cancer cells" (NIH).
- "These checkpoints help keep immune responses from being too strong and sometimes can keep T cells from killing cancer cells" (NIH). 
- As seen in the image below, examples of checkpoint proteins are PD-1 and PD-L1 and examples of checkpoint inhibitors are anti-PD-1 and anti-PD-L1.

Cancer Immunotherapy | Checkpoint Inhibitors

University of Michigan - Ann Arbor

"Cancer immunotherapy refers to the use of therapeutics that unleash the power of a patient’s immune system to fight cancer" (AACR)

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