Purpose: Since the photosensitizers used in PDT (Photodynamic therapy) suffer from several drawbacks, new photosensitizers are being sought. The aim of this study was to estimate safety and efficacy of a new photosensitizer CDHS801, which is one kind of haematoporphyrin derivative. To determine photodynamic effects on superficial bladder carcinoma cells, after the administratipn of this oral photosensitizer, a λ=650 nm semiconductor laser equipment was used in this study. Material and Methods: T
