Being not a smoker does not prevent a person from getting lung cancer. Why is your sister not going to a oncologist. I have lung cancer plus COPD so I go to both. One deals with the copd and the oncologist deals with the cancer. Also another thing I found out, I am a carrier of antitrypsin which causes copd so that can be passed down in families. So a member of either side of my family passed it down to me. But then I smoked so don't know which caused it. Prayers for both you and your sister....... Get all the information you can about the lungs and what to do and prayers to both of you. PS I do ct scans every 6 months to see if anything is growing in my lungs. If there is, they may or maynot make me wait 3 months for another scan then make the decision of what to do. Guess it could depend on what kind of cancer she has too......I sure wouldn't wait a year.......just my feelings .