Boronophenylalanine B-10 is a boronophenylalanine and boron (boron-10) carrier for boron neutron capture therapy (BNCT) with potential anti-tumour activity. Upon administration, boron flange (10B) is mainly taken up by tumour cells. When irradiated with neutrons, boron flange (10B) absorbs neutrons and self-destructs, releasing short-range alpha radiation and "recoil" lithium in the tumour cells, leading to alpha radiation-induced tumour cell death. This highly selective local radio-targeting of tumour cells spares adjacent normal tissue.