ALB and cancer: Importantly, this homogeneous NHC*−Au−rHSA bearing a defined drug:albumin ratio of 1 shows an important maintenance in cell‐killing activity because it exhibits comparable cytotoxicity to the free drug (NHC*−Au−Cl), as assessed by CellTiter Blue assay in both CT26 (colon carcinoma) and HUH‐7 (hepatocarcinoma) cancer cells (Figure 2 c,d).