ImmunoGen slumps, despite positive SORAYA trial of mirvetuximab

21 March 2022
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US antibody-drug conjugate (ADC) specialist ImmunoGen (Nasdaq: IMGN) has announced full results from the pivotal SORAYA trial evaluating the efficacy and safety of mirvetuximab soravtansine (mirvetuximab: IMGN853) monotherapy in patients with folate receptor alpha (FRα)-high platinum-resistant ovarian cancer who have been previously treated with Avastin (bevacizumab).

The trial met its primary endpoint, with confirmed objective rates of 32.45, including five complete responses, and the company expects to submit a Biologic License Application (BLA) with the US Food and Drug Administration this month. Despite the positive news, ImmunoGen’s shares were down more than 25% at $3.93 in early trading this morning.

The results are being presented by Dr Ursula Matulonis in the late-breaking abstract plenary session on Saturday, March 19, at the Society of Gynecologic Oncology (SGO) 2022 Annual Meeting in Phoenix, AZ.

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