CalliSpheres hydrogel microsphere matrix (CSM)

CalliSpheres hydrogel microsphere matrix is a medical device and drug delivery system rather than a biological therapeutic target like a receptor or enzyme. It consists of biocompatible, polyvinyl alcohol (PVA) hydrogel beads modified with sulfonic acid groups, which allow for the loading of positively charged chemotherapeutic drugs such as doxorubicin or irinotecan through ion-exchange mechanisms (PMID: 31431138). These microspheres are primarily utilized in transarterial chemoembolization (TACE) procedures for the treatment of hepatocellular carcinoma and other hypervascular liver tumors. Once injected into the hepatic artery, the microspheres physically block the blood supply to the tumor, inducing ischemia and subsequent necrosis. Simultaneously, the matrix provides a sustained, localized release of the loaded chemotherapy directly into the tumor environment, which increases local drug concentration while minimizing systemic toxicity (PMID: 30532160). Because it is an exogenous material used for drug delivery and mechanical occlusion, it does not possess intrinsic biological signaling functions or disease-causing roles in the human genome.

Other names

CalliSpheres beadsCalliSpheres drug-eluting beadsCSM microspheresCalliSpheres drug-eluting bead transarterial chemoembolization (DEB-TACE)

CalliSpheres microspheres act as a drug delivery vehicle and embolic agent; they are loaded with chemotherapeutic agents via ion exchange, which are then released locally into the tumor after the beads physically occlude the feeding arteries, causing both localized cytotoxicity and ischemic necrosis (PMID: 30532160, PMID: 31431138).