This is my first time answering on of these so I’ll try to make it simple as possible. Cancer is caused by mutations that can come about in many different ways. Because the cause of cancer is so complex (with different genetic and environmental factors), it is much more difficult to treat compared to other diseases. Treatment is also difficult because each person reacts to the treatment differently and it can effect different areas/systems in the body.
There is obviously wayyyy more information about this but this is the most basic explanation. Hope that help!
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