Promising New Cancer Therapy Developed by Albert Einstein College of Medicine

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Immune checkpoints are a normal part of the immune system. Their function is to prevent an immune response from being so powerful that it destroys healthy cells in the body. Immunotherapy drugs called immune checkpoint inhibitors, such as Keytruda and Opdivo, work by unleashing the immune system’s T

cells to attack tumor cells. Their introduction a decade ago marked a major advance in cancer therapy. However, only 10% to 30% of treated patients experience long-term improvement.

PVR protein is usually absent or very scarce in normal tissues but is found in abundance in many types of tumors including colorectal, ovarian, lung, esophageal, head and neck, stomach, and pancreatic cancer as well as myeloid leukemia and melanoma. Moreover, PVRs appeared to inhibit T cell and NK cell activity by binding to a checkpoint protein called TIGIT—prompting efforts to interrupt the TIGIT/PVR pathway by using monoclonal antibodies made against TIGIT.

 

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