The definition of cancers is that they are not safe and have the potential to spread. If it doesn’t have the potential to spread, it’s not cancer but a benign tumor (benign tumors can still cause health complications, though, and can become cancerous.)
Breast cancer actually has one of the worse prognoses of tissue cancers because it spreads readily and can cause secondary tumors in vital organs.
This is why even relatively early intervention is often quite radical (double mastectomy is not uncommon) because aggressive treatment gives the best chance of survival.
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