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Obesity

High-fat diet (controversial)

Alcohol intake

Protective Factors

Regular exercise (after age of 35, strenuous excursive ˅ chance for BC by 14%.

Breastfeeding

Having completed a full-term pregnancy before 30 years of age

Types of Breast Cancer

1. Ductal Carcinoma in Situ

Characterized by the proliferation of malignant cells inside the milk ducts without

invasion into the surrounding tissue.

It is a noninvasive form of cancer (also called intraductal carcinoma).

If not treated,? become invasive cancer

2. Infiltrating Ductal Carcinoma

Is the most common histologic type of breast cancer.

Accounts for 75% of all cases.

The tumors arise from the duct system and invade the surrounding tissues.

They often form a solid irregular mass in the breast.

Other types of breast cancer

3. Infiltrating Lobular Carcinoma (5-10%)

Infiltrating lobular carcinoma accounts for 5% to 10% of breast cancers. The

tumors arise from the lobular epithelium and typically occur as an area of ill-

defined thickening in the breast. They are often multicentric and can be

bilateral.

4. Medullary Carcinoma (5%)

Medullary carcinoma accounts for about 5% of breast cancers, and it tends to be

diagnosed more often in women younger than 50 years. The tumors grow in a

capsule inside a duct. They can become large and may be mistaken for a

fibroadenoma. The prognosis is often favorable.