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5-aminolevulinc acid (5-ALA)-based photodynamic therapy (PDT) and photodiagnosis (PD) present many advantages over treatments with conventional photosensitizers (PS). It offers great tumor specificity, reduced photosensitivity reactions caused by PS accumulation in non-targeted tissues and also inherent PS metabolism into endogenous non-fluorescent heme. However, chemical instability, low bioavailability...
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