When preparing an application for orphan drug designation (ODD) in the European Union (EU), you need to consider key eligibility criteria that are different from those required by the US Food and Drug Administration (FDA). One factor is justifying the “significant benefit” (defined below) of your drug product over existing therapies for an orphan condition. Significant benefit contributes considerably in securing a successful ODD application if the correct approach is taken — as described in two European Medicines Agency (EMA)…