Activity of Irofulven against Human Pancreatic Carcinoma Cell Lines In Vitro and In Vivo

Abstract

Background: Irofulven (MGI 114), a novel antitumor agent synthesized from the natural product illudin S, has a unique mechanism of action involving macromolecule adduct formation, S-phase arrest and induction of apoptosis. Materials and Methods: This study utilized MiaPaCa pancreatic xenografts to demonstrate irofulven antitumor activity using either a daily or intermittent dosing schedule. Additionally, irofulven and gemcitabine were tested in vitro and in vivo to assess the anticancer activity of the combination. Results: Both dosing regimens of irofulven demonstrated curative activity against the MiaPaCa xenografts. Similar activity of irofulven on the intermittent schedule was observed at lower total doses compared to the daily dosing schedule. Furthermore, enhanced antitumor activity was observed when irofulven and gemcitabine were combined compared to single agent activity. Conclusion: These results support further clinical characterization of intermittent irofulven dosing schedules and suggest that irofulven combined with gemcitabine may have activity in patients with pancreatic tumors.