CYCS and cancer: The dependence of the Raman biomarker I1584 of the reduced cytochrome c in Figure 3 vs. cancer malignancy shows that the optimal concentration of cytochrome c in the tissue that is needed to maintain cellular homeostasis corresponds to the Raman normalized intensity of 0.006 ± 0.003 for the breast tissue and 0.074 ± 0.005 for brain tissue.