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Department of Pathology [R. F. B., W. Y., J. H. R.], Division of Epidemiology and Biometrics/School of Public Health [M. L. M.], Division of Neurosurgery [J. H. G.], and College of Pharmacy [A. H. S.], The Ohio State University, Columbus, Ohio 43210, and Medical Department, Brookhaven National Laboratory, Upton, New York 11973 [D. D. J., M. M. N.]
The purpose of the present study was to determine whether the efficacy of boron neutron capture therapy could be enhanced by means of intracarotid (i.c.) injection of sodium borocaptate (BSH) or boronophenylalanine (BPA) with or without blood-brain barrier disruption (BBB-D). For biodistribution studies, F98 glioma-bearing rats were injected i.v. or i.c. with either BSH (30 mg of boron/kg of body weight) or BPA (24 mg of boron/kg of body weight) with or without mannitol-induced, hyperosmotic BBB-D and killed 2.5 h later. The highest tumor boron concentrations for BSH and BPA were attained following i.c. injection with BBB-D (48.6 and 94.0 µg/g, respectively) compared to i.c. (30.8 and 42.7 µg/g) and i.v. injection (12.9 and 20.8 µg). Using the same doses of BSH and BPA, therapy experiments were initiated 14 days after intracerebral implantation of F98 glioma cells. Animals were irradiated 2.5 h after i.v. or i.c. administration of the capture agent with or without BBB-D using a collimated beam of thermal neutrons at the Brookhaven Medical Research Reactor. The median survival times of rats given BSH or BPA i.c. were 52 and 69 days, respectively, for rats with BBB-D; 39 and 48 days for rats without BBB-D; 33 and 37 days for i.v. injected rats; 29 days for irradiated controls; and 24 days for untreated controls. i.c. injection of either BSH or BPA resulted in highly significant enhancement (P = 0.01 and P = 0.0002, respectively) of survival times compared to i.v. injection, and this was further augmented by BBB-D (P = 0.02 and P = 0.04, respectively) compared to i.c. injection. Normal brain tissue tolerance studies were carried out with non-tumor-bearing rats, which were treated in the same way as tumor-bearing animals. One year after irradiation, the brains of these animals showed only minimal radiation-induced changes in the choroid plexus, but no differences were discernible between irradiated controls and those that had BBB-D followed by i.c. injection of either BSH or BPA. Our data clearly show that the route of administration, as well as BBB-D, can enhance the uptake of BSH and BPA, and, subsequently, the efficacy of boron neutron capture therapy.
1 This work was supported by United States Department of Energy Grant DE-AC02-76CH000016. Presented in part at the 44th Annual Meeting of the Radiation Research Society, Chicago, Illinois, April 14–17, 1996, and the Seventh International Symposium on Neutron Capture Therapy, Zürich, Switzerland, September 4–7, 1996.
2 To whom requests for reprints should be addressed, at The Ohio State University, Department of Pathology, 165 Hamilton Hall, 1645 Neil Avenue, Columbus, OH 43210.
Received 9/ 3/96. Accepted 1/16/97.
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