Hormones play an important role in beast cancer.

Hormones play an important role in beast cancer. Higher levels of estrogen are associated with a greater risk of breast cancer. Women who have children later in life also appear to have an elevated risk of breast cancer.

Breast cancer can occur in two different places in the breast, the lobules (the milk-producing tissue), and the ducts that carry the milk to the nipple. The different types of breast cancer are:
Ductal carsinoma in situ - This is an early cancer in the milk ducts and is the most easy of all cancers of the breast to treat.

Invasive ductal carcinoma - This is cancer which started in the milk ducts, but has spread to other areas.

Lobular carcinoma in situ - Technically this is not considered a cancer, but rather a pre-cancerous condition. Women with this condition have an increased risk of developing cancer and need regular checkups.

Invasive lobular carcinoma - This starts in the lobules and spreads. It is difficult to diagnose because it does not always form a lump and does not always show up in mammograms. In breast cancer there are usually no symptoms initially, a lump being the first telltale sign. This lump may occur in or near the breast or in or near the underarm. The breast may change size or shape. There may be discharge from the nipple. There may also be change in the texture of the breast, becoming scaly, dimpled (orange peel), or puckered.

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