One of the best things you can do for some one who is battling cancer (and as a preventative measure for yourself) is to get them to drink lots of raw juices.
The antioxidant boost from cruciferous veggies like broccoli, cabbage, cauliflower and fruits such as berries, help the body repair itself. It does this by neutralizing dangerous free radicals in the body that are causing damage to the cells thus weakening them and making them more prone to illness. These types of juices also work to cleanse the body of toxins and get fluid moving through the kidneys and bladder which reduces infection. This is especially helpful for patients who are in bed for much of the day or have wounds that prevent them from taking traditional baths.