Question: What is the outlook for Subacute Sclerosing Panencephalitis ?
Answer: Most individuals with SSPE will die within 1 to 3 years of diagnosis. In a small percentage of people, the disease will progress rapidly, leading to death over a short course within three months of diagnosis. Another small group will have a chronic, slowly progressive form, some with relapses and remissions. A very small number (approximately 5 percent) may experience spontaneous long term improvement and regain lost function. Prevention, in the form of measles vaccination, is the only real "cure" for SSPE.
Source: NINDS