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Minim Invasive Neurosurg 2006; 49(3): 135-142
DOI: 10.1055/s-2006-932216
Original Article
© Georg Thieme Verlag Stuttgart · New York

Minimally Invasive Photodynamic Therapy (PDT) for Ablation of Experimental Rat Glioma

H.  Hirschberg1, 2, 3 , S.  Spetalen4 , S.  Carper5, 6 , P.  Hole7 , T.  Tillung7 , S.  Madsen3, 5
  • 1Department of Neurosurgery, Rikshospitalet, Oslo, Norway
  • 2Beckman Laser Institute, University of California, Irvine, Irvine, CA, USA
  • 3Department of Health Physics, University of Nevada, Las Vegas, NV, USA
  • 4Department of Pathology, Ullevaal University Hospital, Oslo, Norway
  • 5UNLV Cancer Research Center, University of Nevada, Las Vegas, NV, USA
  • 6Department of Chemistry, University of Nevada, Las Vegas, NV, USA
  • 7Interventional Center, Rikshospitalet, Oslo, Norway
Further Information

Publication History

Publication Date:
18 July 2006 (online)

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Abstract

Objective: The feasibility of using ALA-mediated photodynamic therapy (PDT) tumor ablation as a minimally invasive treatment alternative for malignant brain tumors was evaluated in a rodent model. Treatment efficacy and side effects were evaluated with MRI, histopathology and survival rates. Methods: BT4C orthotopic brain tumors were induced in BD-IX rats. At various time intervals following tumor induction the animals were given 5-aminolevulinic acid (ALA) and 4 hours later optical fibers were inserted directly into the tumor without mechanical debulking or cranial decompression. A 3-day course of steroid treatment was initiated immediately prior to PDT. Results: All untreated animals inevitably died within one month after tumor implantation (28.5 ± 2.5 days). Complete tumor eradication was achieved in only 1/17 rats, but a significant increase in survival was obtained in the group of animals receiving 125 mg/kg ALA and 26 Joules of light fluence. Histopathology revealed large areas of central tumor necrosis, although clusters of viable tumor cells were often found at the tumor periphery. Pronounced edema in the necrotic tumor center as well as in the surrounding brain, and along white matter tracts was evident in all the brains studied from PDT-treated animal. Conclusion: This study suggests that ALA-mediated PDT may become a promising alternative therapy for the minimally invasive treatment of brain tumors. A judicious choice of PDT regimens that minimizes inflammatory responses through the use multiple fractionated long-term treatment protocols would likely be required.

Key words

Glioma - tumor ablation - photodynamic therapy - rodent model

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Henry Hirschberg, M. D., Ph. D. 

Department of Neurosurgery · Rikshospitalet

0027 Oslo

Norway ·

Phone: +47/230/74323

Email: hhirschb@uci.edu