What do you say to a person who has cancer?

Well-meaning but clueless person: “Let me know if you need anything.”
Snarky me: “Really?  Thanks!  Empty your purse and let’s see what you have in there. Wait, is that purse Prada? I need that, I have medical bills to pay and want to look good paying them. Oh, that’s a pretty wedding ring, lots of diamonds, can I have that too?”