@pdlib I'm so sorry your sister is going through this.
There is hope, I had lung cancer in 2009 and I'm still here, obviously 😁. I won't sugar coat it for you, that would be cruel, the treatment was a bit brutal, but I understand the operation involved in my treatment is now available through key hole surgery.
The waiting until you get your definite diagnosis (which type of lung cancer, if it's spread etc) took me from 13/10 (initial diagnosis) to 22/12 (decision on treatment and provisional prognosis) is hard. Though, to be honest I got a bit fed up of being miserable after two weeks and decided I was just wasting, what could be, very precious and limited time worrying about the eventual prognosis. So I decided to enjoy myself, with many lunches with friends and just generally spoiling myself with nice food, drinks and whatever I fancied.
There were two things I did do. Firstly, I was signed off sick from work. I was a senior manager at the time and really didn't feel I could cope with having to handle other problems. And secondly, I asked my friends and family to try not to cry in front of me and to save their crying until they were with others who could support t hem. I just found that all my emotional energy had to go into supporting me, and i had very little left to help them. I'm sure that was hard for some of t hem, but they seemed to understand.
there are a number of different types of lung cancer, and everyone's journey is individual to them and, here comes the cliche, cancer is a word, not a sentance.
good luck