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The type of tissue where your breast cancer arises determines how the cancer behaves and what treatments are most effective. Parts of the breast where cancer begins include: Milk ducts. Ductal carcinoma is the most common type of breast cancer. This type of cancer forms in the lining of a milk duct within your breast. Breast cancer is also classified based on where in the breast the disease started (e.g., milk ducts, lobules), how the disease grows and other factors. The tabs on the left provide an overview of common breast cancer types, common subtypes and rare types. Breast cancer can begin in different areas of the breast — the ducts, the lobules, or in some cases, the tissue in between. In this section, you can learn about the different types of breast cancer, including non-invasive, invasive, and metastatic breast cancers, as well .

How breast cancer forms
How breast cancer forms

Changes or mutations in DNA can cause normal breast cells to become cancer. Certain How breast cancer forms changes are passed on from parents inherited and can greatly increase your risk for breast cancer. Hormones seem to play a role in many cases of breast cancer, but just how this happens is not fully understood. Normal breast cells become cancer because of changes mutations in DNA. DNA is the chemical in our cells that makes up our genes. Genes have the instructions for how our cells function.
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How breast cancer forms
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