Also, I think it goes without saying that cancer is indeed a very complicated disease. It's so complicated that you can have a different set of mutated genes in another person that leads to the same cancer. Different roads leading to the same destination.

On a sad note, my friend's father passed away from mesothelioma of the lungs (a form of lung cancer typically caused by asbestos exposure). They think it's because he did industrial work for a long time. The very sad thing about this case is his wife also developed mesothelioma shortly thereafter. The doctors were highly perplexed, and no one really knows how that could of happened. The only conclusion that makes some amount of sense is she used to wash all of his work clothes. They think she may have been breathing in some asbestos fibers this way. Who knows.