@burcidi-- At this point, close to nothing is known of the causes of bronchoalveolar cancer because it's rare and there isn't much research on it. It's probably caused by environmental factors, but genetics probably have something to do with it too.
I had surgery for BAC and right now I'm on three different medications. I'm stable for now. I never smoked in my life and have not had any chemical exposure that I know of.