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Endoscopic photodynamic therapy (PDT) with haematoporphyrin derivative was used in the primary treatment of 69 patients with inoperable gastrointestinal neoplasms. Patients were divided into three groups: 31 with oesophageal squamous cell carcinoma, 17 with adenocarcinoma of the stomach or lower third of the oesophagus and 21 with rectosigmoid adenocarcinoma. After infusion of 2.5-5.0 mg haematoporphyrin derivative per kilogram of body weight, lesions were irradiated using an argon dye laser (632 nm). During a follow-up period averaging 20 months (27.9 months for 35 surviving patients), complete local tumour destruction and negative histology were observed in 32 out of 69 cases. Flow-cytometric analysis of DNA content before and after PDT suggests that a clonal selection occurs in some cases of treatment failure. The results of this open pilot study suggest the potential efficacy of PDT as a curative treatment for selected cases of inoperable gastrointestinal cancers.
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M T Foultier, and
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M C Douet, and
F Maloisel, and
L Le Bodic
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