Abstract
Tumour reaction and tumour cell kinetics in mouse NR-S1 carcinoma subjected to photodynamic therapy (PDT) were evaluated by percentage of necrotic area as well as by proliferating cell nuclear antigen (PCNA) immunohistochemistry, and an effective PDT fractionation interval was proposed. PDT was carried out in mouse NR-S1 carcinomas using a photosensitizer (haematoporphyrin oligomers: 20 mg kg body weight) and pulsed Nd:YAG dye laser. The percentages of tumour necrotic area and PCNA labelling indices (LIs) in the tumours were assessed at intervals of 0, 0.5, 5, 2.5, 6, 24, 48, and 72 h after PDT. It was demonstrated that maximum damage and repopulation of the tumour cells emerge at 24 and 48 h, respectively, following PDT, suggesting that subsequent light treatment should be performed within 24 h to enhance the therapeutic effect of PDT.
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