There are numerous websites describing hadron therapy (see Google!). Here are a few examples:

Nice description from Physics World.

A more detailed article from Amaldi and Kraft.

Information on hadron therapy from the Particle Therapy Co-Operative Group website.

The Loma Linda Proton Centre site shows how a treatment works and the kind of tumours they have cured.

The very impressive Proton Therapy facility at PSI in Switzerland.

A description of carbon therapy from GSI in Germany.

A list of the benefits of NS-FFAGs for hadron therapy and other applications.