PMID: 6276108Mar 1, 1982

Hematoporphyrin derivative and laser photoradiation in the treatment of lung cancer

Y HayataN Takizawa


Photoradiation therapy (PRT) was performed in 13 lung cancer cases and in one case of severely atypical squamous metaplasia following administration of hematoporphyrin derivative (HpD). The HpD is activated by visible red light (630 nm, 90 to 400 mW) from an argon dye laser. The cytocidal effects were due to the activation of the HpD, since 400 mW of power has in itself no effect on normal epithelium, even with long-term exposure. HpD is retained longer by malignant tissue than by normal tissue. Therefore, the lesions were irradiated with the red laser beam, delivered by a quartz fiber inserted through the instrumentation channel of the fiberoptic bronchoscope, 48 hours or more after intravenous injection of 2.5 to 4.0 mg/kg of HpD. A total of 14 cases received PRT. In one, two small, smooth-surfaced, squamous cell carcinoma tumors in the right B2b of a 74-year-old man who had refused surgery disappeared three days after HpD-photoradiation, and the patient remained disease-free 16 months after the treatment. In 12 cases of centrally located lung cancer local effects were obtained in all. However, there was no significant improvement in survival, attributable to the fact that all were advanced-stage cases. One patient with sever...Continue Reading


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