After a disappointing data readout from the Phase III FORWARD 1 study of its antibody-drug conjugate (ADC) mirvetuximab soravtansine in ovarian cancer, ImmunoGen Inc. tried to placate investors with plans to seek an accelerated approval based on overall survival data in a patient subgroup. The company’s stock rebounded somewhat on that strategy, but fell again on 15 May when the Boston-area firm said the FDA declined to consider an accelerated approval.
ImmunoGen shares finished the trading day down 32% at $2.14 apiece, slightly below the stock’s $2.38 price on 1 March,...







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