 Prior to BNCT, BPA is infused as a fructose complex l-BPA-F into a peripheral vein over 2 hours. Blood samples will be taken for monitoring whole blood boron concentration before starting the BPA infusion, and thereafter at 20 to 40 minute intervals during the infusion, following infusion, and after delivering neutron irradiation. The blood samples will be analyzed for blood boron concentration to estimate the average blood boron concentration during neutron irradiation. 