Hi Spice,
I am truly sorry to hear about your friend. I lost a very close friend to cancer last year. It was very sudden.
Here is a link from the Canadian Cancer Society on how to help someone who has been diagnosed with cancer. I am sure if you contact your local cancer society they would have information for you as well.
http://www.cancer.ca/ccs/internet/standard/0,2704,3172_369341__langId-en,00.html
Sounds like just by being with your friend you are helping.
Breal.