What are types of breast cancer?
There are several types of breast cancer, and they are broken into two main categories.
1. Noninvasive breast cancer:
Noninvasive cancer is also termed carcinoma in situ or precancers. This form of cancer is contained within the milk ducts or lobules in the breast but has not grown or invaded the normal breast tissue. There are two main forms of noninvasive breast cancer
- Ductal carcinoma in situ (DCIS)
- Lobular carcinoma in situ (LCIS)
2. Invasive breast cancer:
Invasive breast cancer is a type of cancer that has spread into the surrounding tissues outside the ducts and lobules. Most breast cancers are invasive, but there are different types of invasive breast cancers, they include
- Invasive ductal carcinoma
- Invasive lobular carcinoma
- Paget disease of the nipple
- Inflammatory breast cancer (IBC)
- Phyllodes tumors of the breast
- Locally advanced breast cancer
- Metastatic breast cancer
Subtypes of breast cancer
Three main subtypes of breast cancer include
- Hormone receptor positive breast cancer: These are cancer cells that need female hormones (estrogen and progesterone) to grow and reproduce. About 80 percent of all breast cancers are estrogen positive and 65 percent are progesterone positive.
- HER2-positive breast cancer: This breast cancer has an excessive amount of the protein called human epidermal growth factor receptor 2 on the surface of the cells. The excess HER2 receptors promote the growth of the cancer cells.
- Triple negative breast cancer: This is another rare type of breast cancer that lacks all three receptors (estrogen, progesterone, HER2), which are commonly found in breast cancer cells. This type of cancer tends to grow and spread more quickly than other types of breast cancers.