I paid for my college education by working in a hospital cancer floor. Since then, I've been doing my own personal research on the causes, amongst the standard known items such as tobacco.
Here are some interesting articles I'd like to share with you. I hope it helps you, your friends and family.
Feel free to forward these links.
Healthy lifestyle triggers genetic changes: study
Vegan Diet and Yoga Fight Cancer
Your milk on drugs - cancer link.