CLYBL and cancer: The SCI was higher in PtIVPCLB, PtIV5CLB, and PtIV56CLB despite the IC50 being in the low micromolar range, which suggests the investigated agents have a better selectivity to cancer cells, as depicted by their greater SCIs which ranged from 3 to 8 compared to cisplatin and CLB which ranged from 0 to 1.