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cancer results in a series of mutations that get past error correction processes. there is no one way cancer happens, and each case is different. the various cell types in your body are susceptible to cancers with different characteristics, so there are patterns in the evolution of the disease, but the variety of cell types leads to a huge range of diseases. furthermore cancer is mutated human cells, so those cells may be really hard to target without also targeting healthy cells.
cancer is a fucking horrific and challenging disease to treat
