pH-responsive worm-like micelles (diameter of ~20 nm and length 50−200 nm) were obtained from methoxy poly(ethylene glycol)-block-poly(2-diisopropyl methacrylate) (mPEG-b-PDPA) loaded with succinobucol (DL about 15% and EE about 93%), a selective inhibitor of vascular cell adhesion molecule-1 (VCAM-1), which was selected as a potential candidate against lung metastasis of breast cancer [107]. Here, VCAM1 is linked to breast cancer.