Immunogen Inc. scored a major win in top-line data from the confirmatory phase III trial called Mirasol evaluating the approved antibody-drug conjugate Elahere (mirvetuximab soravtansine-gynx, “mirv”) vs. chemotherapy in patients with folate receptor alpha-positive platinum-resistant ovarian cancer (PROC). The victory led shares of the Waltham, Mass.-based firm to close May 3 at $12.26, a rise of $7.06, or 135%.