Question: what to say to someone who is losing someone to cancer?
Answer: “I'm not sure exactly what to say, but I want you to know I care.” “You are in my thoughts/prayers.” “Can I bring you a dinner this week? ...  “If you want to talk about him/her, please feel free to call (or text) anytime.” “If you need me, I'll be there. ...  “My favorite memory with (____) is…”