Their treatments generally failed as there was no known cure.
A virus disease for which there is no known cure.
There is no known cure or treatment for the disorder.
Almost all organs are affected, and there is no known cure.
The only known cure is if the child believes in the Imaginary friend again.
"You make it sound like we're a guy with an unknown disease and no known cure."
At the time there was no known cure for the disease.
But the only known cure is delivery of the baby.
The condition has no known cure but usually goes away on its own.
The rare disease has no known cure and is always terminal.