Cationic chemotherapeutic agents loaded into HepaSphere

Cationic chemotherapeutic agents loaded into HepaSphere refers to a specialized drug-device combination used in transarterial chemoembolization (TACE) for the treatment of primary and metastatic liver tumors. HepaSphere microspheres are biocompatible, non-resorbable, superabsorbent polymer (SAP) beads that expand upon contact with aqueous solutions and carry a negative surface charge. This charge allows them to be loaded with positively charged (cationic) drugs, such as doxorubicin or irinotecan, through an ion-exchange process (Merit Medical Systems, Inc.). When administered via the hepatic artery, these microspheres serve to embolize the tumor-feeding vessels, inducing ischemia and subsequent tumor necrosis. Concurrently, they provide a sustained and localized release of the chemotherapeutic agent directly into the tumor tissue, which enhances therapeutic efficacy and significantly reduces systemic drug exposure and associated side effects. This technology is primarily utilized for patients with unresectable hepatocellular carcinoma or liver metastases from colorectal cancer who are not candidates for surgical resection.

Other names

HepaSphere microspheresSuperabsorbent polymer microspheresSAP-microspheresDrug-eluting beads (DEB)HepaSphere loaded with DoxorubicinHepaSphere loaded with Irinotecan

HepaSphere microspheres function through a dual mechanism of action: mechanical embolization and controlled drug elution. The microspheres are composed of a negatively charged superabsorbent polymer (sodium acrylate and vinyl alcohol copolymer) that binds cationic (positively charged) chemotherapeutic agents via an ion-exchange mechanism (Seki et al., 2011, JVIR). Upon delivery into the hepatic artery, the spheres physically occlude the tumor's blood supply, leading to ischemic necrosis. Simultaneously, the loaded drug is released into the tumor microenvironment over an extended period as physiological ions exchange with the drug molecules on the polymer matrix, maintaining high local concentrations while reducing systemic toxicity (Malagari et al., 2010, CVIR).