I read somewhere that a primary cancer seldom kills ; most of the time the metastasic-induced does. Why ? There should be far more “bad” cells in the primary site, doesn’t it ?
The most anatomical origins for cancers (skin, breast and prostate) are not vital organs, so a cancer in one of those places won’t kill you if it stays in place. The danger is if it metastasizes to a vital organ (most commonly the lungs or liver) and interferes with its function. If a cancer starts in a vital organ, it’s more likely to kill you through its effects on that organ, not by spreading elsewhere.
The most anatomical origins for cancers (skin, breast and prostate) are not vital organs, so a cancer in one of those places won’t kill you if it stays in place. The danger is if it metastasizes to a vital organ (most commonly the lungs or liver) and interferes with its function. If a cancer starts in a vital organ, it’s more likely to kill you through its effects on that organ, not by spreading elsewhere.