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Conceptually, when I heard about internal UV disinfectant, it made sense to me. 1/4 of all people will have cancer treatment with x-ray photons from one of the machines my company manufacturers. It makes sense that perhaps UV photons could similarly be used.
The principle at work is that healthy tissue has strong mechanisms to repair damaged DNA, but cancer/viruses do not. Although UV may damage healthy DNA along with the virus, the healthy tissue will recover and the virus will not.
On a tangent, there's a protein that performs 3 incredible functions. First, it repairs damaged DNA. If it fails to repair the damage, it instructs the faulty cell to not reproduce. As a final precaution, it instructs an irrecoverable cell to die (apoptosis).
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