5-fluorouracil (5FU) and photodynamic therapy (PDT) are two popular cancer therapies that induce long-term anti-tumor immunity, mediated by cells of the innate and adaptive immune systems, in addition to their primary tumor-killing effects. The 5FU pretreatment combination with PDT (cPDT), involving the application of aminolevulinic acid (ALA), accumulation of protoporphyrin IX (PpIX) in tumors, and exposure to blue light results in lesion clearance mainly by immunological cell death. When combined, 5FU and PDT potentiate the generation of anti-tumor immune responses, resulting in a greater tumor reduction than is possible with either treatment modality given alone.
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