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Breast cancer: Clinical
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It’s the most common cancer in women, but can rarely affect men as well.
Another risk factor is exposure to ionizing radiation, like from chest X-rays and CT scans or previous radiation therapy for other cancers located in the chest.
Some breast cancers have mutations in the ERBB2 gene which causes an increase in human epidermal growth factor receptor 2, or HER2, which promotes cell division.
Breast cancer is the second leading cause of cancer deaths in women after lung cancer, and this is largely due to the fact that breast cancers often don’t cause pain or discomfort until they’ve metastasized.
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