Methods for treating pain and predicting cancer immune therapy efficacy

Value proposition

Chronic pain is a major health problem that affects approximately 1.5 billion people worldwide. The annual economic cost of chronic pain in the United States, including both treatment and lost productivity is estimated at $635 billion. Current non-opioids treatments are partially effective, while opioids are habit-forming, especially with long-term use. Therefore, there is an urgent demand for effective and safe pain medicine.


Dr. Ru-Rong Ji and colleagues have reported a method for treating pain intended to help treat inflammatory pain, neuropathic pain, and cancer pain. They have uncovered programmed cell death ligand-1 (PD-L1) as an endogenous inhibitor of acute and chronic pain. The checkpoint inhibitory protein PD-L1 inhibited acute inflammatory pain. Furthermore, PD-L1 reduced chronic pain effectively, including nerve-injury-induced neuropathic pain and bone cancer pain in rodents, via both peripheral and central actions. PD-L1 is produced not only by cancer cells but also by non-malignant tissues such as skin, dorsal root ganglion neurons, and spinal cord. Given the high potency of PD-L1 in suppressing pain, local targeting of PD-L1 signaling axis in sensory neurons may lead to the development of new analgesics. This invention was demonstrated in mouse models.

Other applications

The invention can also be used as a diagnostic tool to help predict the efficacy of immunotherapies in patients by performing a quantitative sensory test immediately after administration of a therapeutic capable of suppressing PD-1 -associated nociceptive neuron activity. This was demonstrated in melanoma-bearing mice studies.


  • A new therapeutic target for pain that provides an alternative to opioids
  • The same target can be used to assess the efficacy of immunotherapies by measuring changes in pain levels
  • Invention has been demonstrated in animal models
endogenous levels of PD-L1

Duke File (IDF) Number



  • Ji, Ru-Rong


    • Patent Number: 11,007,250
    • Country: United States of America

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School of Medicine (SOM)