In Vitro and In Vivo Studies of Boron Neutron Capture Therapy: Boron Uptake/Washout and Cell Death

Boron neutron capture therapy (BNCT) is a binary radiotherapy based on thermal‐neutron irradiation of cells enriched with 10B, which produces α particles and 7Li ions of short range and high biological effectiveness. The selective uptake of boron by tumor cells is a crucial issue for BNCT, and studies of boron uptake and washout associated with cell survival studies can be of great help in developing clinical applications. In this work, boron uptake and washout were characterized both in vitro for the DHDK12TRb (DHD) rat colon carcinoma cell line and in vivo using rats bearing liver metastases from DHD cells. Despite a remarkable uptake, a large boron release was observed after removal of the boron‐enriched medium from in vitro cell cultures. However, analysis of boron washout after rat liver perfusion in vivo did not show a significant boron release, suggesting that organ perfusion does not limit the therapeutic effectiveness of the treatment. The survival of boron‐loaded cells exposed to thermal neutron...