An oregano (Origanum vulgare L.)alcoholic extract standardized in phenolic compounds (protocatechuic acid, rosmarinic acid, p-coumaric acid, apigenin, and luteolin glycosides) showed anti-tumor effects upon MCF-7 breast cancer cells by means of decreased stem cell biomarkers (CD44, CD24, ALDH1) and the activation of the apoptotic mitochondrial pathway [166]. Here, CD44 is linked to breast cancer.