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An agent composed of substance P (SP) conjugated to the ribosome-inactivating protein and neurotoxin saporin (SAP), isolated from the seeds of the plant Saponaria officinalis (SP-SAP), with potential analgesic activity. Upon administration, SP-SAP targets the SP receptor, neurokinin-1 receptor (NK-1R), located on neurons. When SP-SAP binds NK-1R and the receptor/conjugate complex internalizes, the saporin moiety inactivates ribosomes and prevents protein synthesis, which causes cell death, destroys NK-1R-expressing nerves and decreases pain perception. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C107682\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C107682\' NCI Thesaurus)
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