Now that we've covered what not to say, let's talk about some winning things to say to somebody with cancer.
These are my preferences after more than 20 years as a cancer patient, then a cancer survivor, and then a cancer patient again. Clearly different things are going to bug different people. You will do the best you can because you're a nice person, and your friend with cancer will be able to tell that you are doing the best you can. Don't over-think this.
1. I don't know what to say. If you're feeling uncomfortable talking to us, we can probably tell. The best way to dispel [...]
You've lost so much weight. You look fantastic! Thanks for noticing! My doctor says I'm malnourished.
You're strong and I know you can beat this. Are you going to be disappointed in me if I die?
I read that kelp/almonds/asparagus have magical anti-cancer properties. You should definitely eat some, then.
I know what you're going through. Your grandfather's colostomy bag does not make you an expert on my medical situation.
That reminds me of when my dog/cat/gerbil had a tumor on her leg. I'm sure that was heartbreaking for you.