Hi, Lizhu,
It's very scary when a relative is diagnosed with cancer and you feel that you cant do anything to help
You say lung cancer but not whether it is carcinoid.
Although carcinoids can be slow growing it is very difficult to advise on as everyone is different and every situation seems to be different. Sometimes they show on CT scans, other times they need a PET scan.
Be guided by the doctor.
If you go with her for her appointments be prepared to listen to what you are being told. Take along a pad and pencil so you can write things down as you're often too stressed to listen properly and remember what was said.
Your aunt may be fearful or she may have had time to come to terms with her condition. Whatever it is, make sure that she is not the one supporting you through this and that you are able to help her where she needs help whether is it just sitting with her or taking her out to have fun, if able, between treatments
Use your local cancer council for support and advice
Best wishes to you both
Mary