Both NIPBC-1 and NIPBC-2 cell lines are negative for estrogen receptor (ER), progesterone receptor (PR) and HER2/neu, and hence represent triple negative breast cancers (TNBC), which are considered to be aggressive tumors having higher histological grade, worse prognosis and occur mostly in younger women [49-51]. This evidence concerns the gene PGR and triple-negative breast carcinoma.