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Cargo-loading capacity of polymeric micelles could be improved by reducing the core crystallinity and the improvement in the amount of loaded cargo was cargo-polymer affinity dependent. The effect of medium chain triglyceride (MCT) in inhibiting PCL crystallization was confirmed by DSC and polarized microscope. When incorporating MCT into polymeric micelles, the maximum drug loading of disulfiram (DSF), cabazitaxel (CTX), and TM-2 (a taxane derivative) increased from 2.61 ± 0.100%, 13.5 ± 0.316%, and 20.9 ± 1.57% to 8.34 ± 0.197%, 21.7 ± 0.951%, and 28.0 ± 1.47%, respectively. Moreover, the prepared oil-containing micelles (OCMs) showed well-controlled particle size, good stability, and decreased drug release rate. MCT incorporation showed little influence on the performances of micelles in cell studies or pharmacokinetics. These results indicated that MCT incorporation could be a core …