Cool idea! In theory this would work but organ (or limb) transplants are also very risky and difficult. Sometimes the organ just dies or the body rejects it, and there is a big shortage of donor organs.
Another issue is that late-stage cancer can spread throughout the whole body (known as metastasis), so that replacing only one organ wouldn’t stop the cancer from coming back.
Training the immune system to fight cancer could be an awesome strategy because the immune system works throughout the whole body. Have a look at CAR T cells if you’re interested!
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