10/12/2026
Breast cancer is not just one disease.
There are several types, and they can differ based on where the cancer starts, how it grows, and whether it responds to hormones or certain treatments.
1. The main types of breast cancer
1. Ductal Carcinoma In Situ (DCIS)
Cancer cells are found inside the milk ducts but have not spread into surrounding breast tissue. It is considered non-invasive, or stage 0 breast cancer.
The most common type of breast cancer. It begins in a milk duct and spreads into nearby breast tissue. It can spread to lymph nodes or other parts of the body.
3. Invasive Lobular Carcinoma (ILC)
Starts in the milk-producing lobules and spreads into surrounding tissue. It may be harder to detect as a distinct lump on a physical exam or imaging.
Cancer that tests negative for estrogen receptors, progesterone receptors, and excess HER2 protein. It does not respond to hormone therapy or HER2-targeted treatments, but other treatments are available.
6. HER2-Positive Breast Cancer
Cancer cells have high levels of the HER2 protein, which can help them grow. Although it can grow quickly, effective HER2-targeted treatments are available.
2. Other less common types
Paget disease of the breast:
A rare type involving the skin of the ni**le and often the surrounding ar**la. It may cause itching, redness, flaking, or crusting.
Phyllodes tumors: Rare tumors that develop in the breast's connective tissue. Most are benign, but some are borderline or cancerous.
Angiosarcoma: A rare cancer that develops in blood or lymphatic vessel cells in breast tissue or skin.
Male breast cancer: Men can develop breast cancer, most commonly invasive ductal carcinoma. Although uncommon, it is important for men to recognize warning signs.
3. Breast cancer types by hormone and protein status
Doctors also classify breast cancer based on test results, which help determine treatment.
ER-positive Cancer cells have estrogen receptors.
PR-positive Cancer cells have progesterone receptors.
HER2-positive Cancer cells have excess HER2 protein or gene activity.
Triple-negative Cancer tests negative for ER, PR, and HER2.
HR-positive/HER2-negative Cancer has hormone receptors but is not HER2-positive.
Black women in the United States have a higher breast cancer death rate than White women, making awareness, early evaluation, and equitable access to care especially important.
Remember: A new breast change does not automatically mean cancer, but it should be evaluated by a healthcare professional.
