IDMC Recommends Stopping Depatuxizumab Mafodotin Study

AbbVie announced the Phase 3 INTELLANCE-1 study of depatuxizumab mafodotin (Depatux-M, previously known as ABT-414) in patients with newly diagnosed glioblastoma (GBM), whose tumors have EGFR (epidermal growth factor receptor) amplification, demonstrated no survival benefit for patients receiving Depatux-M at an interim analysis. An Independent Data Monitoring Committee (IDMC) recommended the study be stopped due to lack of survival benefit for patients receiving Depatux-M compared with placebo when added to the standard regimen of radiation and temozolomide. No new safety findings were observed. Enrollment in all ongoing Depatux-M studies has been halted.

"Glioblastoma patients and their caregivers face a devastating disease for which there are few therapeutic options. While we are disappointed that Depatux-M did not demonstrate a survival benefit in the INTELLANCE-1 study, we remain committed to discovering and developing therapies to address some of the most debilitating cancers," said Michael Severino, M.D., vice chairman and president, AbbVie.

The INTELLANCE-1 trial was conducted in collaboration with the RTOG Foundation, an independent, non-profit cancer research organization. Results from INTELLANCE-1 will be submitted for presentation at a medical conference and for publication in a peer-reviewed journal.

"The highly collaborative partnership between RTOG Foundation's scientific and physician leaders, under the leadership of Andrew Lassman, M.D., the study principal investigator, and the AbbVie team facilitated the early completion of this important international clinical trial. The RTOG Foundation's outstanding glioblastoma experts will continue to vigorously investigate new approaches to this very challenging malignancy," said Walter J. Curran Jr., M.D., F.A.C.R., F.A.S.C.O., RTOG Foundation Board Chair and Executive Director of the Winship Cancer Institute of Emory University.

The randomized, placebo-controlled Phase 3 study was designed to evaluate the efficacy and safety of Depatux-M versus placebo when administered with concurrent radiation and temozolomide and with adjuvant temozolomide in subjects with newly diagnosed EGFR-amplified GBM. The primary endpoint was overall survival, and the interim analysis was based on data from 639 patients. Depatux-M is not approved, and its safety and efficacy have not been evaluated by regulatory authorities.

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