Embolization with microspheres is a therapeutic strategy based on the selective occlusion of the blood vessels feeding a tumor. This procedure is intraarterially performed in the clinical setting for the treatment of liver cancer. The practice has evolved over the last decade through the incorporation of drug loading ability, biodegradability and imageability with the subsequent added functionality for the physicians and improved clinical outcomes for the patients. This review highlights the evolution of the embolization systems developed through the analysis of the marketed embolic microspheres for the treatment of malignant hepatocellular carcinoma, namely the most predominant form of liver cancer. Embolic microspheres for the distinct modalities of embolization (i.e., bland embolization, chemoembolization and radioembolization) are here comprehensively compiled with emphasis on material characteristics and their impact on microsphere performance. Moreover, the future application of the embolics under clinical investigation is discussed along with the scientific and regulatory challenges ahead in the field. STATEMENT OF SIGNIFICANCE: Embolization therapy with microspheres is currently used in the clinical setting for the treatment of most liver cancer conditions. The progressive development of added functionalities on embolic microspheres (such as biodegradability, imageability or drug and radiopharmaceutical loading capability) provides further benefit to patients and widens the therapeutic armamentarium for physicians towards truly personalized therapies. Therefore, it is important to analyze the possibilities that advanced biomaterials offer in the field from a clinical translational perspective to outline the future trends in therapeutic embolization.

Although colloidal carriers have been in the pipeline for nearly four decades, standardized methods for testing their drug-release properties remain to be established in pharmacopeias. The in vitro assessment of drug release from these colloidal carriers is one of the most important parameters in the development and quality control of drug-loaded nano- and microcarriers. This lack of standardized protocols occurs due to the difficulties encountered in separating the released drug from the encapsulated one. This review aims to compare the most frequent types of release testing methods (i.e., membrane diffusion techniques, sample and separate methods and in situ detection techniques) in terms of the advantages and disadvantages of each one and of the key parameters that influence drug release in each case.

Background/Objective: Cannabidiol (CBD) has gained increasing interest due to its multifaceted anticancer properties and favourable safety profile. Glioblastoma multiforme (GBM), a highly aggressive brain tumour with limited treatment options, represents a compelling target for CBD-based therapies. In this study, we report the rational design of two distinct formulations of lipid nanocapsules (LNCs) co-encapsulating CBD and a chemotherapeutic agent, tailored for intracranial and systemic administration. Methods: The cytotoxicity of various CBD–chemotherapeutic combinations, including temozolomide, carmustine, doxorubicin, and paclitaxel (PTX), were screened in vitro in U-87 MG and U-373 MG human GBM cell lines and analyzed for chemical compatibility. Moreover, the efficacy and the anti-migratory effect of the selected combination was further assessed in ovo and in vitro, respectively. Lastly, two LNC formulations coloaded with the selected combination were prepared in two different sizes via the phase inversion temperature method. Results: First, CBD in solution exhibited potent cytotoxicity and significantly inhibited cell migration in both GBM cell lines. Among the CBD–chemotherapeutic combinations tested, only CBD + PTX demonstrated both additive/synergistic interaction and favourable chemical compatibility. Second, this enhanced effect was confirmed in ovo. Third, the CBD + PTX combination also exhibited anti-migratory effect. Finally, two co-loaded LNC formulations—51.2 ± 0.9 nm and 25.9 ± 0.3 nm in size—were developed for intracranial and systemic delivery, respectively. Both formulations exhibited high monodispersity, a slightly negative ζ-potential, and consistently maintained a 7.5:1 CBD:PTX mass encapsulation ratio across both particle sizes. Conclusions: CBD + PTX co-loaded LNCs represent a promising and versatile nanomedicine platform for GBM therapy.