Because you don't treat someone for a disease that they haven't been diagnosed for. The idea that you'd prophylactically give someone these nanodiamonds is a bi

Because you don't treat someone for a disease that they haven't been diagnosed for. The idea that you'd prophylactically give someone these nanodiamonds is a big stretch at this point... especially when the PR is that "It’s like having a flashlight inside your body that basically lasts forever." You really want to have a method for turning off the flashlight when you don't need it. Now, if you have a patient that has been already diagnosed with cancer, and the nanodiamonds are used to monitor tumor progression or watch for metastasis, then that's a different story. Note: these aren't the same as vaccines, since cancer isn't a communicable disease (largely).