Triple-Negative Breast Cancer (TNBC) is a type of breast cancer that does not have three common receptors found in other breast cancers: estrogen, progesterone, and the human epidermal growth factor receptor 2 (HER2). This means that TNBC does not respond to hormonal therapies or targeted treatments that are effective for other breast cancer types. TNBC tends to be more aggressive and is often diagnosed at a younger age. It is also more likely to spread to other parts of the body. Treatment typically involves a combination of surgery, chemotherapy, and radiation, as there are currently no specific targeted therapies for TNBC.