Therefore, the authors identified that their scaffolds could be utilized to selectively kill tumor cells while causing minimal damage to normal cells and reported two key factors for such selectivity: (1) the production of ROS, which did not harm healthy cells to the same extent as cancer cells, mainly because of the higher amounts of H2O2 in tumor cells [60]; and (2) the fact that certain tumor cells, such as breast cancer cells, displayed more transferrin receptors than healthy cells. This evidence concerns the gene TFRC and neoplasm.