All cancers are called (named) for the tissue type they originate in. Therefore, a breast cell that becomes cancerous is called breast cancer. This is important because NOT all cancers act the same, and treatment is offered accordingly. Also: most cancers (left untreated) continue to grow and spread… Common places (for example) would be the lungs, or bone. When a breast cancer spreads to the lungs, it is now called metastatic breast cancer, NOT lung cancer. A lung cancer has very different biologic behavior, which guides treatment.
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