Prions are structurally abnormal proteins that force normal proteins to take the same misfolded shape and spread through tissues like infectious diseases. This is another disease-causing pathogen discovered by human beings after realizing that bacteria, viruses, mycoplasma and other microorganisms can cause disease. Therefore, if you want to successfully develop effective treatments, you need to target (targeted) active prions rather than large amounts of proteins in dead plaques and entanglements.
The option 'Diseases caused by prions can be effectively treated' can be inferred from this paragraph.