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Cancer is a leading cause of death worldwide. Developing targeted therapies that are selectively toxic to cancer cells while sparing normal cells may lead to more effective treatment options. Photodynamic therapy (PDT) is one of these therapies; it is a promising non-invasive treatment and a good alternative to cutting surgery or chemotherapy. PDT is a two-step process that involves the administration of a photosensitive dye (photosensitizer) leading to selective uptake and retention in the tumor cells. Following this, the photosensitizer is activated by exposure to light of an appropriate...