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Matulonis UA , Birrer MJ , O'Malley DM , Moore KN , Konner J , Gilbert L , Martin LP , Bauer TM , Oza AM , Malek K , Pinkas J , Kim SK
Evaluation of Prophylactic Corticosteroid Eye Drop Use in the Management of Corneal Abnormalities Induced by the Antibody-Drug Conjugate Mirvetuximab Soravtansine
Clin Cancer Res. 2019 Mar 15;25(6) :1727-1736
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Abstract
PURPOSE: Reversible, low-grade ocular adverse events (AE) are associated with administration of mirvetuximab soravtansine, a folate receptor alpha (FRalpha)-targeted antibody-drug conjugate undergoing phase III clinical evaluation in platinum-resistant ovarian cancer. This study investigated the underlying mechanisms of ocular toxicity and evaluated primary prophylactic use of corticosteroid eye drops in patients receiving mirvetuximab soravtansine. PATIENTS AND METHODS: Target expression in the human eye was determined by IHC. The ocular toxicity profile of mirvetuximab soravtansine was assessed preclinically using Dutch-Belted rabbits. In a phase I clinical study, patients with ovarian cancer were treated with 6 mg/kg mirvetuximab soravtansine intravenously once every 3 weeks, including one expansion cohort with corticosteroid eye drops administered daily for the first 10 days of each treatment cycle. RESULTS: FRalpha expression was absent from human corneal tissues. Ocular abnormalities in the rabbit eye appeared phenotypically consistent with off-target effects on the cornea. Forty patients were enrolled in the expansion cohort. Reversible grade 1 or 2 blurred vision and keratopathy occurred in 16 (40%) and 12 (30%) patients, respectively; no grade 3/4 ocular events were observed. Compared with those patients who did not receive primary prophylaxis, corticosteroid eye drop use resulted in fewer dose reductions (5% vs. 15%) and none discontinued due to ocular AEs. CONCLUSIONS: Preclinical modeling was predictive of the corneal-related symptoms seen in some patients dosed with mirvetuximab soravtansine. Primary prophylactic use of topical corticosteroid eye drops resulted in a trend toward symptomatic improvement and a reduction in ocular AE-related dose modifications in patients treated with mirvetuximab soravtansine.
Notes
Matulonis, Ursula A Birrer, Michael J O'Malley, David M Moore, Kathleen N Konner, Jason Gilbert, Lucy Martin, Lainie P Bauer, Todd M Oza, Amit M Malek, Karim Pinkas, Jan Kim, Stella K eng Clin Cancer Res. 2019 Mar 15;25(6):1727-1736. doi: 10.1158/1078-0432.CCR-18-2474. Epub 2018 Nov 9.