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I can jump in here. In your hypothetical, the proximate cause of death would not be lung cancer but rather prostate cancer that metastasized to the lungs. I'm assuming the man didn't subsequently -- and independently -- suffer from primary lung cancer, which is a possible variation on your scenario.
As a rule, cancer is always identified by virtue of its primary occurrence site regardless of where it may travel (metastasize) in the body. Prostate cancer that spreads to the bones or lungs remains prostate cancer, in that if you biopsied those remote malignancies, they would in fact be prostate cells.