Breast cancer is a heterogeneous disease that is broadly classified into hormone-receptor-positive, estrogen receptor positive and progesterone receptor positive (ER+/PR+), human epidermal growth factor receptor-2 overexpressing (HER2+) or triple-negative breast cancer (TNBC or ER−; lacks ER, PR and HER2). Here, PGR is linked to triple-negative breast carcinoma.