Cancers are removed via surgery *all the time*. Either the tumor itself, or part or all of an organ (depending on the organ) can be removed. A bladder removal is not uncommon in people with bladder cancer, although there is no such thing as an artificial bladder to replace it with. we can’t just remove any organ like it’s no big deal and we certainly don’t have artificial ones to take their place in most cases.
A lot of times though, the cancer has spread beyond its original location, at which point surgery is not longer going to be useful. Any cancer can spread to other parts of the body. That is, by definition, what cancers do. If the cancer is confined to one spot that is operable, great, but if it’s spread to the lymphatic system and other organs, removing the original organ that was the source of the cancer won’t do a thing.
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