Therefore, we next analyzed the cell cycle profile of Fe@Au-treated CRC. In Figure 5, OECM1 cells show S-phase delay, as found in our previous report.17 Intriguingly, Fe@Au caused a G1/G0 delay in CRC cells. Therefore, the decreased cell survival rate of Fe@Au-treated CRC cells is the result of growth inhibition, rather than cell death, which is consistent with our observations in oral cancer cells