We very effectively treated two patients with recurrent
glioblastoma with modified
boron neutron capture therapy (BNCT). In this paper, we describe the effectiveness of this treatment, and discuss the ways in which we modified the treatment. A 61-year-old man had a first operation for a right temporal
glioblastoma, followed by full-dose chemo-
radiotherapy. One year after the operation a partial removal was performed for the recurrent
tumor at the same site. Fifty days after the second surgery, the patient received BNCT. We used an epithermal neutron beam as the neutron source, and used both
sodium borocapate and boronophenylalanine as
boron compounds with the
craniotomy. Forty-eight hours after the BNCT, the follow-up MRI was applied to estimate the early effect of this treatment, which showed a 70% reduction in the contrast enhanced lesion, compared with the pretreatment MRI. In addition, the lesion/normal brain ratio of
thallium-SPECT had improved markedly. No serial sequelae appeared after this treatment, and the patient remains healthy 6 months after the treatment. A 29-year-old young lady had a right temporal
brain tumor, which was partially resected and followed by stereotactic radiosurgery for the residual mass. Seven months after the radiosurgery, a second operation was performed, which revealed the
glioblastoma as diagnosis. We applied BNCT uneventfully for this patient with epithermal beam and two kinds of
boron compounds as described above. For the treatment of the patient irradiation was applied without
craniotomy with marked reduction of
tumor volume immediately after the treatment.