Is each cancer considered unique, though? Or would the cure for, for instance, breast cancer, also deal with other forms as well? After all, we already have fairly standardized procedures for most types of cancer.
So if it is possible to cure several with the same cure, then I'd disagree with saying there's over 200 different "fundamental" types of cancer.
Cancers have common traits: spreading uncontrollably, metastasizing - these are what make cells cancerous.
But cells from different specialized tissues tend to become cancerous in different ways, by expressing different genes. So a treatment that targets a particular gene expression may work for one type but not others.
And a cancer that returns after treatment will have yet a different gene expression (usually resistant to that particular treatment).
So if it is possible to cure several with the same cure, then I'd disagree with saying there's over 200 different "fundamental" types of cancer.