I don't know what it's like to have cancer. I don't want to know. I do know when I talk to people with cancer, I try to treat them like they are alive and normal. Because they actually are alive and normal. Even when it's obvious they only have a few hours to live, if they're conscious, I'm cracking jokes and talking about my kids or sports (note, that's all I do in general).
Anyway, I'm babbling. Just pass this along to someone you know who has cancer.