On December 17, 2019 ImmunoGen Inc., (Nasdaq: IMGN), a leader in the expanding field of antibody-drug conjugates (ADCs) for the treatment of cancer, reported that the U.S. Food and Drug Administration (FDA) has advised that a new single-arm study in platinum-resistant ovarian cancer could support accelerated approval for mirvetuximab soravtansine (Press release, ImmunoGen, DEC 17, 2019, View Source [SID1234552431]). Based on this guidance, the company will initiate SORAYA, a pivotal trial to evaluate mirvetuximab monotherapy in women with folate receptor alpha (FRhigh platinum-resistant ovarian cancer who have been previously treated with Avastin (bevacizumab).

Schedule your 30 min Free 1stOncology Demo!
Discover why more than 1,500 members use 1stOncology™ to excel in:

Early/Late Stage Pipeline Development - Target Scouting - Clinical Biomarkers - Indication Selection & Expansion - BD&L Contacts - Conference Reports - Combinatorial Drug Settings - Companion Diagnostics - Drug Repositioning - First-in-class Analysis - Competitive Analysis - Deals & Licensing

                  Schedule Your 30 min Free Demo!

"We have engaged in constructive discussions with FDA and evaluated all avenues to bring mirvetuximab to patients more quickly," said Mark Enyedy, ImmunoGen’s President and Chief Executive Officer. "Having aligned with the agency that women with FRα-high platinum-resistant ovarian cancer that has progressed after prior treatment with bevacizumab require better therapeutic options, we are pleased to advance mirvetuximab in this patient population with SORAYA, which, if successful, would enable us to submit an application for accelerated approval during the second half of 2021. We anticipate enrolling the first patient in SORAYA next quarter and expect top-line data from the study in mid-2021."

ImmunoGen’s mirvetuximab program now includes two new trials, SORAYA and MIRASOL, which will enroll concurrently.

SORAYA: Pivotal Trial

SORAYA is a single-arm trial with mirvetuximab that will enroll approximately 100 patients. Eligibility criteria include patients with platinum-resistant ovarian cancer whose tumors express high levels of FRα using the PS2+ scoring method, and who have been treated with up to three prior regimens – at least one of which included bevacizumab. The primary endpoint of this study is overall response rate by investigator assessment and the key secondary endpoint is duration of response.

MIRASOL: Confirmatory Trial

MIRASOL is a randomized Phase 3 trial in which 430 patients will be randomized 1:1 to receive either mirvetuximab or investigator’s choice of single-agent chemotherapy (weekly paclitaxel, pegylated liposomal doxorubicin, or topotecan). Eligibility criteria include patients with platinum-resistant ovarian cancer whose tumors express high levels of FRα using the PS2+ scoring method, and who have been treated with up to three prior regimens. The primary endpoint of this study is progression free survival by investigator assessment. The key secondary endpoints include: overall response rate, overall survival, and patient-reported outcomes.

"We have reviewed the data generated from our Phase 1 and FORWARD I studies using the PS2+ scoring method and have identified 70 patients who would meet the key eligibility criteria for SORAYA. The overall response rate in these patients was 31.4% with 95% CI (20.9%, 43.6%) and a median duration of response of 7.8 months with 95% CI (3.98, -)," said Anna Berkenblit, MD, Senior Vice President and Chief Medical Officer of ImmunoGen. "These data compare quite favorably to the response rate seen with single agent chemotherapy in platinum resistant disease, which was 12% in the AURELIA and CORAIL trials, and included patients naïve to and previously treated with bevacizumab."

Berkenblit continued, "Replicating these data in SORAYA would support an application for accelerated approval in advance of the completion of MIRASOL, which would thereafter provide the randomized data needed for conversion to full approval. We are delighted to advance both studies as soon as possible."

CONFERENCE CALL INFORMATION

ImmunoGen will hold a conference call today at 8:00 a.m. ET to discuss these results. To access the live call by phone, dial (877) 621-5803; the conference ID is 7190603. The call may also be accessed through the Investors and Media section of immunogen.com. Following the call, a replay will be available at the same location.

ABOUT MIRVETUXIMAB SORAVTANSINE

Mirvetuximab soravtansine (IMGN853) is the first folate receptor alpha (FRα)-targeting ADC. It uses a humanized FRα-binding antibody to target the ADC specifically to FRα-expressing cancer cells and a potent anti-tumor agent, DM4, to kill the targeted cancer cells.