Definition

Breast cancer is cancer that starts in the tissues of the human breast. It is
the second most common cancer in women, but can also affect men.
There are two main types of breast cancer. The more common of the
two, ductal carcinoma, begins in the ducts, or tubes, that carry milk from
the interior of the breast to the nipple. The other major type is lobular
carcinoma. It begins in the lobules, which are the parts of the breast that
secrete milk.

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