What Is TNBC? TNBC is a type of breast cancer in which tumor cells do not have estrogen receptors (ER), progesterone receptors (PR), or HER2 proteins. Because these three targets are absent, it cannot be treated with hormone therapy or HER2-targeted drugs and is usually treated with chemotherapy or immunotherapy. Stage 1 means that the… Continue reading Stage 1 Triple Negative Breast Cancer