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Photodynamic therapy (PDT) is a medical treatment by which a combination of a photosensitising drug and visible light cause the destruction of selected cells. Thick lesions, such as nodular basal cell carcinomas (BCCs), or lesions with overlying keratinous debris, are reported as being difficult to eradicate using 5-aminolevulinic acid-based photodynamic therapy (ALA-PDT). Such treatment failures...
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