(a) Cytotoxicity study of paclitaxel, rapamycin, and docetaxel free drug and the drug encapsulated BCP5000 nanogels at 0.5 μM drug concentration in DU-145 cell line. (b) Cytotoxicity study of paclitaxel encapsulated BCP5000 nanogel with varied crosslinking density at 0.5, 1, and 10 μM drug concentration in DU-145 cell line. (c), (d) Cytotoxicity study of structrural variant DNC in MDA-MB-231 and MCF-7 cell lines (CPT concentration 0.25 μg/mL, polymer concetration 0.625 μg/mL).