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Applications of optical and laser spectroscopy to the medical field,including photodynamic therapy (PDT) and laser-induced fluorescence diagnostics (LIF) for cancer treatment and diagnostics,respectively,will be presented.Photodynamic therapy in conjunction with LIF for demarcation of the treatment target area will be discussed.To overcome the limited light penetration in superficial illumination interstitial delivery (IPDT) with the light transmitted to the tumour via optical fibres has been developed.