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So.. pretty much we can't rely on existing mechanisms in our bodies to defeat cancer. Obviously.. we need to find damaged cells, remove them, and replace them with undamaged cells. Likely we need to do this on a continuous basis.

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Your immune system is continuously monitoring the body for cancerous cells. Each of us have probably had A cancerous cell hundreds of times. In order for the cancer to continue to grow, though, it needs a constellation of mutations to impede the immune response, among other things. Essentially, it's a race between a proto-tumor accreting more mutations, and the immune system finding and destroying it.

Not human bodies, no. But look at other long lived species like elephants, who rarely get cancer and have even more cells than we do.

Just splice the right snippet of elephant DNA into ours to kill cancer for good.

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