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Sitemaster may be best positioned to respond. I believe the stats generally accepted are that approximately one man in 36 will die due to prostate cancer. Suppose a man is diagnosed with prostate cancer and undergoes RP. Unfortunately however the cancer has not been confined to the gland and in the fullness of time metastasizes to the lungs. In due course the gentleman expires, proximate cause lung cancer.
How is his death reported. Lung cancer or prostate cancer?
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.
