In eight, the treatment did not work, and they died of cancer.

They usually are considered only if other treatment does not work.

How do we know whether a particular treatment really works?

See your child's doctor at least every 3 to 6 months to check how well the treatment is working.

A treatment that worked one time may not work again.

The treatment, he said, does work well for some people.

A treatment that once worked well may no longer work.

But treatment may work better than experts used to think.

It may be hard to tell whether a treatment is working.

As her father says, the treatment worked, but the patient died.