Breast cancer begins in the tissues of the breast. It is the most common cancer in women, but it can also appear in men. It’s a disease where malignant cells develop in the breasts, most often in the inner lining of milk ducts. In rare cases, breast cancer can start in other areas of the breast.
There are two main types of breast cancer:
• Ductal carcinoma starts in the tubes (ducts) that move milk from the breast to the nipple. Most breast cancers are of this type.
• Lobular carcinoma starts in parts of the breast, called lobules that produce milk.
Estrogen Receptor (ER) positive cancer: Many breast cancers are sensitive to the hormone estrogen. This means that estrogen causes the breast cancer tumor to grow. Such cancer is called estrogen receptor positive cancer or ER positive cancer.
HER2-positive breast cancer: HER2 refers to a gene that helps cells grow, divide, and repair themselves. When cells have too many copies of this gene, cells including cancer cells grow faster.
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