BREAST CANCER
Breast cancer refers to the cancer in the breast, and is commonly found in women.
The main treatments of breast cancer are commonly surgery, radiation, chemotherapy, hormone therapy and targeted therapy. But medical science continues to study better treatments and drugs along with new combinations of existing treatments.
It is established now that breast cancer can be divided into subtypes that respond differently to various types of treatment.
The three main clinically known subtypes are:
Hormone receptor (HR) positive- The breast cancers are those which contain the estrogen receptor (ER) and/or progesterone receptor (PR). These cancers grow in response to these hormones and can be treated with hormone therapies.
Human epidermal growth factor receptor 2 (HER2) positive- The cancers that have high amounts of the HER2 protein; they can be HR positive or negative. The treatment would include therapies that target HER2.
Triple-negative breast cancer- These are the cancers that do not contain ER, PR or HER2.


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