The MTT test was performed in order to evaluate the effect induced by five different concentrations (5, 15, 25, 50, 100 μM) of test samples (ABZ, PU, ABZ-PU, respectively) on two genotypically different human breast adenocarcinoma cell lines (MCF7–ER+ and MDA-MB-231–ER−). Here, ESR1 is linked to breast adenocarcinoma.