What is Triple Negative Breast Cancer (TNBC)? When I first heard the words Triple Negative Breast Cancer, I didn't realize to what extent I was facing. The more the doctor explained, the more fearful I became. I honestly had no idea there were different types of breast cancers. Triple negative breast cancer stands apart from other types of breast cancer due to its lack of three specific receptors commonly found in other types of breast cancers. Estrogen, Progesterone, and HER2. Unfortunately, the absence of these three receptors makes TNBC a more aggressive type of invasive breast cancer. It tends to grow and spread faster, and has fewer treatment options. Basically, my cancer cells don't have estrogen or progesterone receptors and also don't make any of the protein called HER2. The cancer cells test negative on all three tests. Who does it normally affect? TNBC accounts for about 10-15% of a...