The cause is currently unknown and there are no known treatments.

In late 1891, she began to battle tuberculosis, which at the time had no known treatment other than rest and good nutrition.

The disease is progressive and there is no known treatment.

There is no known treatment for the fatal disease.

There is no cure nor any known treatment that can halt the disease's progress.

The first, a Phase 1 study, involves a small number of patients (maybe a dozen or two) who cannot be helped by other known treatments.

There is no known treatment to prevent lipomas or affect their growth.

There is no known treatment for the disorder, although symptoms can be treated.

There is no known treatment for infection with these viruses.

He gave a wink to indicate there was no known treatment for either of the other offenders.