Why haven’t scientists worked it out yet?
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There are various reasons for cancer being so hard to treat. First there are many different types of cancer that can appear in many different places. Second cancer may start in one place but it can spread all over the body into places where removing it is impossible. Lastly it’s really hard to get rid of the actual cancer cells if you try to physically cut them out you first have the challenge of getting to the actual cancerous cells which might be in an important organ such as the brain where cutting it out would just kill the patient anyway second it is really hard to cut out every single one of the cancer cells in the body because they can be basically impossible to find. If you go for a more broad treatment like radiation yes it can kill most of the cancer cells but it also slowly kills the rest of your body as well and it isn’t guaranteed to get every single cancer cell.
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