There’s a very big technical difference between a “treatment” and a “cure”. To this day, we can’t “cure” the common cold, but we can certainly treat it.
A cure is a permanent fix. Chemotherapy is not only highly destructive to the rest of your body (leading to an increased risk of senescent cells turning cancerous) but it almost never completely destroys all of the cancerous cells in your body.
There are some extremely promising “cures” for cancer in testing right now, but what we use in the vast majority of cases are “treatments”. (It’s much more profitable)
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