The FDA has approved Novartis' (NYSE:NVS) Signifor drug to treat sufferers of Cushing's disease who aren't eligible for surgery. Cushing's disease is a rare hormone condition that can cause obesity, skin that bruises easily and excess hair growth. Novartis will have to carry three more analyses of Signifor for high sugar levels in patients' blood, the risks stemming from such levels, and for monitoring the long-term use of the treatment.