Respuesta :
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
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.