On May 1, 2017 ImmunoGen, Inc. (Nasdaq: IMGN), a leader in the expanding field of antibody-drug conjugates (ADCs) for the treatment of cancer, reported that the results from a Phase 1 dose-escalation study evaluating mirvetuximab soravtansine (IMGN853) in patients with folate receptor alpha (FRα)-positive solid tumors were published in the journal Cancer (Press release, ImmunoGen, MAY 1, 2017, View Source [SID1234518773]). The previously disclosed data demonstrated encouraging clinical activity and a manageable safety profile for mirvetuximab soravtansine (IMGN853), and informed the dose that was used in Phase 1 expansion cohorts and the ongoing Phase 3 FORWARD I trial of patients with platinum-resistant ovarian cancer.
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"These Phase 1 results have played an important role in determining the appropriate dose for mirvetuximab soravtansine in the recently initiated Phase 3 FORWARD I trial of patients with platinum-resistant ovarian cancer," said Kathleen Moore, M.D., Associate Professor, Department of Obstetrics and Gynecology at the Stephenson Cancer Center at the University of Oklahoma. "The combination of these data and the recent data published in the Journal of Clinical Oncology further support the dose that has been chosen and patients who have been selected for FORWARD I."
The open-label, Phase 1 dose-escalation study treated a total of 44 patients with recurrent ovarian (52%) or endometrial cancer (25%), along with renal cell carcinoma and non-small cell lung cancer (11% and 9%, respectively). Patients received mirvetuximab soravtansine on day 1 of a 21-day cycle (Q3W dosing) with cycles repeated until dose-limited toxicity or progression, concluding the recommended dose for future trials is 6.0 mg/kg of mirvetuximab (based on adjusted ideal body weight) dosed once every three weeks. On the basis of the study findings, and additional data that demonstrated the importance of FRα expression levels for optimal mirvetuximab sorvatansine activity, the Company designed the Phase 3 FORWARD I trial utilizing this dose in patients with platinum-resistant ovarian cancer, along with a Phase 1b trial evaluating mirvetuximab in combination with standard-of-care chemotherapy and targeted agents.1
Mirvetuximab soravtansine exhibited a manageable safety profile and encouraging preliminary clinical activity. Adverse events (AEs) were generally mild with the majority being grade 1 or grade 2 (least severe grades). The most commonly observed AEs were fatigue, blurred vision and diarrhea.1
The publication, "Phase I dose-escalation study of mirvetuximab soravtansine (IMGN853), a folate receptor alpha-targeting antibody-drug conjugate, in patients with solid tumors," is available on the Cancer website.
About Mirvetuximab Soravtansine
Mirvetuximab soravtansine (IMGN853) is the first FRα-targeting ADC. It uses a 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.
Mirvetuximab soravtansine is ImmunoGen’s lead program and is in Phase 3 testing as a single agent for the treatment of platinum-resistant ovarian cancer. The candidate is also being assessed in combination regimens for both platinum-resistant and platinum-sensitive disease in Phase 1b/2 FORWARD II trial.
About Ovarian Cancer and FRα
In 2016, approximately 22,300 new cases of ovarian cancer will be diagnosed in the U.S. and more than 14,200 women will die from the disease.2 ImmunoGen estimates that 60% of ovarian cancer cases have medium or high FRα expression.
Standard first-line therapy for ovarian cancer is a platinum-based regimen. Once the cancer becomes platinum-resistant, treatment options include single-agent cytotoxic therapies such as pegylated liposomal doxorubicin, paclitaxel, or topotecan.