title: An In Vitro Evaluation of Four Types of Drug-Eluting Microspheres Loaded with Doxorubicin.
abstract: OBJECTIVE
  To compare in vitro properties of 4 drug-eluting embolic agents loaded with doxorubicin.
  
  
  METHODS
  DC Bead (100-300 µm), LifePearl (200 µm), HepaSphere (30-60 µm), and Tandem (100 µm) microspheres were loaded with 40 mg/20 mL of doxorubicin per milliliter of microspheres. Loading, elution, diameter changes after loading, changes in the amount of doxorubicin loaded over 2 weeks in storage, and time in suspension were evaluated.
  
  
  RESULTS
  All microspheres loaded > 99% doxorubicin within 1 hour. In vitro elution reached a plateau by 6 hours, with 30% ± 5, 21% ± 2, 8% ± 3, and 6% ± 0 of the loaded doxorubicin eluted for LifePearl, DC Bead, HepaSphere, and Tandem microspheres, respectively, with at least 1 statistically significant difference between at least 2 of the products in doxorubicin eluted at every time point. The times to elute 75% of the total released doxorubicin were 197, 139, 110, and 77 min for DC Bead, LifePearl, HepaSphere, and Tandem microspheres, respectively. The average diameters of LifePearl, DC Bead, and Tandem microspheres were reduced after loading by 24%, 20%, and 9%, respectively. After suspension in contrast medium, no changes were observed in doxorubicin loading over 2 wk. After loading, times in suspension were 8.4 min ± 0.2, 6.0 min ± 0.1, 3.1 min ± 0.2, and 2.9 min ± 0.3 for Tandem, LifePearl, DC Bead, and HepaSphere microspheres, respectively.
  
  
  CONCLUSIONS
  Although drug-eluting embolic agents universally loaded doxorubicin within 1 hour, the elution amounts, rates of release, diameter shrinkage, and times in suspension varied by product.
authors.affiliation: Department of Interventional Radiology, Gustave Roussy Cancer Center, Villejuif, France; UFR Médecine Le Kremlin-Bicêtre, Universite Paris-Sud XI, Le Kremlin Bicêtre, France. Electronic address: thierry.debaere@gustaveroussy.fr.
authors.forename: Thierry
authors.initials: T
authors.lastname: de Baere
authors.affiliation: MicroVention, Tustin, California.
authors.forename: Stephen
authors.initials: S
authors.lastname: Plotkin
authors.affiliation: MicroVention, Tustin, California.
authors.forename: Renee
authors.initials: R
authors.lastname: Yu
authors.affiliation: MicroVention, Tustin, California.
authors.forename: Allison
authors.initials: A
authors.lastname: Sutter
authors.affiliation: MicroVention, Tustin, California.
authors.forename: Yue
authors.initials: Y
authors.lastname: Wu
authors.affiliation: MicroVention, Tustin, California.
authors.forename: Gregory M
authors.initials: GM
authors.lastname: Cruise
mesh_terms: D000903:Antibiotics, Antineoplastic / Q000008:administration & dosage / Q000737:chemistry*; D016461:Chemoembolization, Therapeutic / Q000379:methods*; D004317:Doxorubicin / Q000008:administration & dosage / Q000737:chemistry*; D004337:Drug Carriers; D007700:Kinetics; D008863:Microspheres; D010316:Particle Size; D012995:Solubility
chemical_list: D000903:Antibiotics, Antineoplastic; D004337:Drug Carriers; D004317:Doxorubicin