How long does it take lung cancer to form?

Question by Rebekah05: How long does it take lung cancer to form?
My 37 year old sister has two masses of incurable cancer on each lung. It is inoperable. I am just curious. How long did she have it. 1 year, 2 years? I just wonder how long she was walking around with cancer not even knowing it. Thank for any help. She is to young to die.

Best answer:

Answer by AKA Inverse Mushroom Cloud
I believe 5-10 years would be a reasonable guess.

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