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Proceedings Paper

Adjuvant photodynamic therapy in surgical management of cerebral tumors
Author(s): Zong-Qian Chen; Si-En Wu M.D.; Shu-Gan Zhu
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Paper Abstract

We have performed high dose photoradiation therapy in patients with cerebral tumors. Twenty-seven patients had gliomas, two had metastatic cancer of the brain, one had malignant meningioma. Hematoporphyrin derivative was administered intravenously. All patients underwent a craniotomy with a radical or partial excision of the tumor. There was no evidence of increased cerebral edema and other toxicity from the therapy, and all patients were discharged from the hospital within 15 days after surgery. On the basis of animal experiments our institute started using photodynamic therapy (PDT) as an adjuvant measure to the operative therapy in 30 cases of cerebral tumors. Ten of these patients were excluded from this group because of the short postoperative following time. Here, the details of our experiences are presented as follows: 106 of C6 type glioma cell strain were implanted into the frontal lobe of a Chinese hamster. Fourteen days later intracranial gliomas developed, which were larger than 4 mm in diameter, HpD in a dosage of 4 mg/kg was injected into the tail vein of the animals. The fluorescence was seen 5 minutes later. The diagnostic laser used was He-Ca (Hc-type 15A, made at Shanghai Laser Institute) with a wavelength of 441.6 nm, power of 30 mw. The fluorescence reached its peak point 24 hours later, and the normal tissue can be identified by the lack of fluorescence. Then, the tumor tissue was further radiated with an Ar laser (made in Nanjing Electronic Factory, type 360), pumped dye-laser (made in Changchun Optic Machinery Institute, type 901) with a wavelength of 630 nm, and an energy density of more than 200 Joules/cm2, which might get the tumor cells destroyed selectively. The effect of photoradiation may reach as deep as 4 - 7 mm into the brain tissue without cerebral edema or necrosis.

Paper Details

Date Published: 5 March 1993
PDF: 4 pages
Proc. SPIE 1616, International Conference on Photodynamic Therapy and Laser Medicine, (5 March 1993); doi: 10.1117/12.136996
Show Author Affiliations
Zong-Qian Chen, Shandong Tumor Hospital and Institute (China)
Si-En Wu M.D., Shandong Tumor Hospital and Institute (China)
Shu-Gan Zhu, Affiliated Hospital of Shandong Medical Univ. (China)

Published in SPIE Proceedings Vol. 1616:
International Conference on Photodynamic Therapy and Laser Medicine
Junheng Li M.D., Editor(s)

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