How will you know if it helped me?

We have to choose one main thing to measure, before the trial starts. It might be how long you live. It might be how you feel. It might be what a scan looks like. These are not the same thing.

A drug can shrink a tumor and add no time to your life. When someone says a treatment works, ask them: works at what?

Written by two physicians. Checked against patient information from the US National Cancer Institute and Cancer Research UK.