ImmunoGen Presents Full Results from Positive Pivotal SORAYA Trial of Mirvetuximab Soravtansine in Ovarian Cancer at SGO Annual Meeting
Trial Met Primary Endpoint with Confirmed Objective Response Rate of 32.4%, including 5 Complete Responses; Updated Median Duration of Response of 6.9 Months
Mirvetuximab Demonstrated Meaningful Anti-Tumor Activity, Consistent Safety, and Favorable Tolerability in FRα-High Platinum-Resistant Ovarian Cancer
BLA Submission Expected this Month
Investor Event to be Held on
“Patients with platinum-resistant ovarian cancer have limited treatment options, and these are associated with low response rates and significant toxicity," said
SORAYA is a single-arm study of mirvetuximab in patients with platinum-resistant ovarian cancer whose tumors express high levels of FRα and who have been treated with one to three prior regimens – at least one of which included bevacizumab. The primary endpoint for the study is confirmed objective response rate (ORR) as assessed by investigator and the key secondary endpoint is duration of response (DOR). ORR was also assessed by blinded independent central review (BICR). The study is designed to rule out a 12% ORR, based on expected outcomes of 4% to 13% with available single agent chemotherapy. Data previously generated in a post-hoc pooled analysis of seventy patients from prior studies of mirvetuximab in platinum-resistant disease formed the basis for the design of SORAYA, with an investigator-assessed ORR of 31.4%, median DOR of 7.8 months, and median progression-free survival (PFS) of 4.4 months.
Key Findings from SORAYA
SORAYA enrolled 106 patients with a median of three prior lines of therapy; 51% had three prior lines of therapy and 48% had one to two prior lines of therapy. All patients received prior bevacizumab; 48% of patients received a prior PARP inhibitor (PARPi).
Confirmed ORR by investigator was 32.4% (95% confidence interval [CI]: 23.6%, 42.2%), including five complete responses (CRs). ORR by BICR was 31.6% (95% CI: 22.4%, 41.9%), including five CRs. Response rates were consistent regardless of number of prior lines of therapies or prior PARPi.
- 1-2 prior lines of therapy: ORR by investigator was 35.3% (95% CI: 22.4%, 49.9%).
- 3 prior lines of therapy: ORR by investigator was 30.2% (95% CI: 18.3%, 44.3%).
- Prior PARPi exposure: ORR by investigator was 38.0% (95% CI: 24.7%, 52.8%).
- Without prior PARPi exposure: ORR by investigator was 27.5% (95% CI: 15.9%, 41.7%).
The median DOR was 6.9 months (95% CI: 5.6, 8.1) by investigator as of the
March 3, 2022data cut-off.
- The median PFS was 4.3 months (95% CI: 3.7, 5.1) by investigator and 5.5 months (95% CI: 3.8, 6.9) by BICR.
- Mirvetuximab was well-tolerated, consistent with the known safety profile seen in more than 700 patients treated in the broader mirvetuximab program. Treatment-related adverse events led to dose reductions in 19% of patients, dose delays in 32% of patients, and discontinuations in 7% of patients. The most common treatment-related adverse events were low-grade and generally reversible, including blurred vision (41% all grade; 6% grade 3), keratopathy (36% all grade; 8% grade 3+), and nausea (29% all grade; 0% grade 3).
“We are thrilled with the SORAYA results, which are remarkably consistent with data previously generated with mirvetuximab in a heavily-pretreated population of platinum-resistant ovarian cancer patients that included prior exposure to bevacizumab. Based on the impressive anti-tumor activity, durability of response, and safety profile observed in SORAYA, we believe mirvetuximab has the potential to displace single-agent chemotherapy as the standard of care for FRα-high platinum-resistant ovarian cancer,” said
Oral Presentation Details
Title: Efficacy and Safety of Mirvetuximab Soravtansine in Patients with Platinum-Resistant Ovarian Cancer with High Folate Receptor Alpha Expression: Results from the SORAYA Study
Session: Scientific Plenary IV: Late-Breaking Abstracts
Trial in progress posters from ImmunoGen's MIRASOL and PICCOLO trials of mirvetuximab in ovarian cancer and a Phase 2 investigator-sponsored combination trial of mirvetuximab with carboplatin as a neoadjuvant therapy for patients with newly diagnosed ovarian cancer will also be presented. Final data from the mirvetuximab plus bevacizumab platinum-agnostic combination, which were originally shared at ASCO 2021, will also be featured in a seminal presentation.
Additional information can be found at www.sgo.org.
INVESTOR EVENT INFORMATION
ImmunoGen will hold an investor event to discuss the SORAYA oral presentation, featuring a roundtable with key opinion leaders, on
ABOUT MIRVETUXIMAB SORAVTANSINE
Mirvetuximab soravtansine (IMGN853) is a first-in-class ADC comprising a folate receptor alpha-binding antibody, cleavable linker, and the maytansinoid payload DM4, a potent tubulin-targeting agent, to kill the targeted cancer cells.
ImmunoGen is developing the next generation of antibody-drug conjugates (ADCs) to improve outcomes for cancer patients. By generating targeted therapies with enhanced anti-tumor activity and favorable tolerability profiles, we aim to disrupt the progression of cancer and offer our patients more good days. We call this our commitment to TARGET A BETTER NOW™.
Learn more about who we are, what we do, and how we do it at www.immunogen.com.
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