Deep lying tumours like aggressive brain cancer remain very difficult to treat and existing therapies offer only marginal increase in survival rates. In the case of photomedical therapies they are very effective, but mainly limited by their insufficient depth of light penetration into tissue. Current neutron-based therapies have sufficient penetration depth but suffer from lack of cancer specificity.

In FRINGE we propose a genuinely new hybrid-technology. At its heart are chemical agents (photosensitisers – PS) which preferentially accumulate in the tumours especially in brain cancers where the blood brain barrier is compromised. The PSs designed for FRINGE will contain metal centres like Gadolinium (Gd), to enable interaction with incoming neutrons and facilitate the transfer of neutron energy into electron excitation of the PS, confirmed by concomitant fluorescence emission. Interaction with ambient oxygen will generate reactive oxygen species which will kill the tumour cells. The main scientific breakthrough of this project will be to establish experimental proof-of-principle of this novel neutron-activated therapy. FRINGE will combine the advantages of photomedical therapies (no mutagenic radiation) with the advantages of neutron-based therapies (large penetration depth). The externally-applied neutron beam can be energy-tuned to become therapeutic exactly at the depth of the tumour. Exploiting Gd as a contrast agent, FRINGE can also become a theranostic modality by use of magnetic resonance imaging.