The cytotoxicity observed and the resistance of the MDA-MB-231 cells to extracts of A. monostachya in our study have been observed previously when exposing the same cell line to extracts of Origanum majorana L.; there is an expression of survivin, which is a therapeutic target against breast cancer [46], which could explain the behavior that was observed by the cell line against extracts of A. monostachya. This evidence concerns the gene BIRC5 and breast cancer.