Depending on the type of cancer and stage it’s in, that alters many variables in treatment. An example, having a cancerous cyst being removed is more likely to remain healthy, than more complex problems like blood which is why leukemia can be fatal.
My best explanation is
Some cancer is in blood and tissue and doesn’t form a tumor, such as leukemia. Therefore a usage of “chemotherapy” is needed.
Sorry if this isn’t a good explanation
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