Journal of Neuro-Oncology

, Volume 33, Issue 1–2, pp 59–70 | Cite as

Enhanced survival of glioma bearing rats following boron neutron capture therapy with blood-brain barrier disruption and intracarotid injection of boronophenylalanine

  • Weilian Yang
  • Rolf F. Barth
  • Joan H. Rotaru
  • Melvin L. Moeschberger
  • Darrel D. Joel
  • Marta M. Nawrocky
  • Joseph H. Goodman


Boronophenylalanine (BPA) has been used for boron neutron capture therapy (BNCT) of brain tumors in both experimental animals and humans. The purpose of the present study was to determine if the efficacy of BNCT could be enhanced by means of intracarotid (i.c.) injection of BPA with or without blood-brain barrier disruption (BBB-D) and neutron irradiation using a rat brain tumor model. For biodistribution studies, F98 glioma cells were implanted stereotactically into the brains of Fischer rats, and12 days later BBB-D was carried out by i.c. infusion of 25% mannitol (1.373 mOsmol/ml), followed immediately by i.c. administration of 300, 500 or 800 mg of BPA/kg body weight (b.w.). At the 500 mg dose a fourfold increase in tumor boron concentration (94.5 μg/g) was seen at 2.5 hours after BBB-D, compared to 20.8 μg/g in i.v. injected animals. The best composite tumor to normal tissue ratios were observed at 2.5 hours after BBB-D, at which time the tumor: blood (T: Bl) ratio was10.9, and the tumor: brain (T: Br) ratio was 7.5, compared to 3.2 and 5.0 respectively for i.v. injected rats. In contrast, animals that had received i.c. BPA without BBB-D had T: Bl and T: Br ratios of 8.5 and 5.9, respectively, and the tumor boron concentration was 42.7μg/g. For therapy experiments, initiated 14 days after intracerebral implantation of F98 glioma cells, 500 mg/kg b.w. of BPA were administered i.v. or i.c. with or without BBB-D, and the animals were irradiated 2.5 hourslater at the Brookhaven Medical Research Reactor with a collimated beam of thermal neutrons delivered to the head. The mean survival time for untreated control rats was 24 ± 3 days, 30 ± 2 days for irradiated controls, 37 ± 3 days for those receiving i.v. BPA, 52 ± 15 days for rats receiving i.c. BPA without BBB-D, and 95 ± 95 days for BBB-D followed by i.c. BPA and BNCT. The latter group had a 246% increase in life span (ILS) compared to untreated controls and a 124% ILS compared to that of i.v. injected animals. These survival data are the best ever obtained with the F98 glioma model and suggest that i.c. administration of BPA with or without BBB-D may be useful as a means to increase the efficacy of BNCT.

boron neutron capture therapy osmotic blood-brain barrier disruption boronophenylalanine glioma 


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Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • Weilian Yang
    • 1
  • Rolf F. Barth
    • 1
  • Joan H. Rotaru
    • 1
  • Melvin L. Moeschberger
    • 2
  • Darrel D. Joel
    • 4
  • Marta M. Nawrocky
    • 4
  • Joseph H. Goodman
    • 3
  1. 1.Department of PathologyThe Ohio State UniversityColumbusUSA
  2. 2.Division of Epidemiology and Biometrics/School of Public HealthThe Ohio State UniversityColumbusUSA
  3. 3.Division of NeurosurgeryThe Ohio State UniversityColumbusUSA
  4. 4.Brookhaven National LaboratoryUptonUSA

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