FDA Grants Priority Review of ImmunoGen’s Supplemental Biologics License Application for ELAHERE (mirvetuximab soravtansine-gynx) in Platinum-Resistant Ovarian Cancer

ImmunoGen, Inc. (Nasdaq: IMGN), a leader in the expanding field of antibody-drug conjugates (ADCs) for the treatment of cancer, today announced that the US Food and Drug Administration (FDA) has filed the supplemental Biologics License Application (sBLA) supporting the conversion of the accelerated approval of ELAHERE (mirvetuximab soravtansine-gynx) for the treatment of patients with folate receptor alpha (FRα)-positive, platinum-resistant epithelial ovarian, fallopian tube, or primary peritoneal cancer who have received one to three prior systemic treatment regimens to full approval. The application has been granted Priority Review designation with a Prescription Drug User Fee Act (PDUFA) action date of April 5, 2024.

"With the FDA’s filing of our sBLA, we are one step closer to securing full approval of ELAHERE in the US and establishing this novel ADC as the standard of care in FRα-positive platinum-resistant ovarian cancer," said Michael Vasconcelles, MD, ImmunoGen's Executive Vice President, Research, Development, and Medical Affairs. "This regulatory milestone, achieved just over one year after ELAHERE’s accelerated approval, underscores the significance of the confirmatory MIRASOL data and the broader data set seen to date with ELAHERE, as well as the urgency with which our teams worked to bring this potentially practice-changing therapy to eligible patients in need. We look forward to collaborating closely with the FDA throughout the review process."

The confirmatory Phase 3 MIRASOL trial of ELAHERE in platinum-resistant ovarian cancer forms the basis of the sBLA. Top-line data from the MIRASOL trial were disclosed in May 2023 and presented as a late-breaking abstract at the 2023 American Society of Clinical Oncology (ASCO) Annual Meeting. In the MIRASOL trial, ELAHERE demonstrated statistically significant and clinically meaningful improvements in progression-free survival, objective response rate, and overall survival compared to investigator's choice (IC) of single-agent chemotherapy. ELAHERE demonstrated a tolerable safety profile compared to IC chemotherapy, consisting predominantly of low-grade ocular and gastrointestinal events.