Di Liberto et al. [21] have proven that the extract in the form of Sicilian Origanum vulgare L. oil induces apoptosis in breast cancer cells (human breast cancer epithelial cell line estrogen (ERα)-positive receptor MCF-7 and triple-negative human breast cancer cell line MDA-MB-231 (ER-, PR-, HER-2-negative). This evidence concerns the gene ERBB2 and breast cancer.