Impedance magnitude in the absence of cancer cells (PBS + Nanoprobes) for the case of SK-BR-3 cell line rises in the order of PBS measurements, such condition might be explained by the low quanity of nanoprobes required for incubation given the high expression of the predominant surface protein HER-2 with respect to EpCAM and MUC-1 for MCF-7 and MDA-231 cells respectively (see Fig. 3. The gene discussed is ERBB2; the disease is cancer.